Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749739
Hiroaki Yamazoe, H. Henniger, K. Iwamoto
Free-space optical communication (FSOC) in low-Earth orbit (LEO) is one of the most active areas of research and development in space communication technology. Since LEO has narrower coverage than higher orbits, optical communication terminals need to support multiple optical ground stations (OGSs) for sufficient link opportunities. In addition, considering that optical lasers are more susceptible to bad weather than radio waves, supporting multiple stations is also effective in terms of site diversity. Recently, Sony Computer Science Laboratories (Sony CSL) and Kongsberg Satellite Services (KSAT) conducted a successful experiment to downlink data from an optical communication terminal attached to the International Space Station (ISS) to an OGS in Nemea, Greece. In this paper, we report the results of the demonstration. The space terminal used in the experiment is the same individual used in a previous demonstration of Sony CSL that achieved optical communication with an OGS in Japan, indicating that our space terminal is compatible with independently designed multiple OGSs. More to the point, KSAT designed their OGS for commercial use, with low complexity and cost-competitive to radio ground stations. Our terminal is compatible not only with OGSs established for specific missions but also with such small and generic commercial OGSs, which could contribute to the widespread use of our optical communication terminals in orbit. In the future, the OGS used in this study will be connected to the Optical Nucleus Network, which is a network of OGSs. Since it is significant to be able to utilize such terrestrial resources, we plan to continue our development while maintaining compatibility with various OGSs.
{"title":"The communication experiment result of Small Optical Link for ISS (SOLISS) to the first commercial optical ground station in Greece","authors":"Hiroaki Yamazoe, H. Henniger, K. Iwamoto","doi":"10.1109/icsos53063.2022.9749739","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749739","url":null,"abstract":"Free-space optical communication (FSOC) in low-Earth orbit (LEO) is one of the most active areas of research and development in space communication technology. Since LEO has narrower coverage than higher orbits, optical communication terminals need to support multiple optical ground stations (OGSs) for sufficient link opportunities. In addition, considering that optical lasers are more susceptible to bad weather than radio waves, supporting multiple stations is also effective in terms of site diversity. Recently, Sony Computer Science Laboratories (Sony CSL) and Kongsberg Satellite Services (KSAT) conducted a successful experiment to downlink data from an optical communication terminal attached to the International Space Station (ISS) to an OGS in Nemea, Greece. In this paper, we report the results of the demonstration. The space terminal used in the experiment is the same individual used in a previous demonstration of Sony CSL that achieved optical communication with an OGS in Japan, indicating that our space terminal is compatible with independently designed multiple OGSs. More to the point, KSAT designed their OGS for commercial use, with low complexity and cost-competitive to radio ground stations. Our terminal is compatible not only with OGSs established for specific missions but also with such small and generic commercial OGSs, which could contribute to the widespread use of our optical communication terminals in orbit. In the future, the OGS used in this study will be connected to the Optical Nucleus Network, which is a network of OGSs. Since it is significant to be able to utilize such terrestrial resources, we plan to continue our development while maintaining compatibility with various OGSs.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122573198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749707
S. Alam, Andrea Di Mira, M. Yarrow, C. Heese, J. Singleton, A. Kloth, J. Steinborn, J. Clowes
This paper describes a beacon system for satellite optical communications developed for IZN-1 (Izaña One) - the new robotic optical ground station of the European Space Agency deployed in Tenerife. The system provides a CCSDS standard compatible 1590 nm signal at two selectable modulation frequencies (10 and 100 kHz) to support optical acquisition of two CubeSat missions in low Earth orbits. The system architecture is based on a multistage optical amplifier seeded by a directly modulated DFB laser diode. The average optical power generated by the system is >6 W with diffraction limited beam quality and the beacon signal will be transmitted via a subaperture of the station main telescope. The beacon will be installed at IZN-1 and perform first LEO Direct-to-Earth optical communication links at the beginning of 2022.
{"title":"Beacon system for ESA IZN-1 Optical Ground Station","authors":"S. Alam, Andrea Di Mira, M. Yarrow, C. Heese, J. Singleton, A. Kloth, J. Steinborn, J. Clowes","doi":"10.1109/icsos53063.2022.9749707","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749707","url":null,"abstract":"This paper describes a beacon system for satellite optical communications developed for IZN-1 (Izaña One) - the new robotic optical ground station of the European Space Agency deployed in Tenerife. The system provides a CCSDS standard compatible 1590 nm signal at two selectable modulation frequencies (10 and 100 kHz) to support optical acquisition of two CubeSat missions in low Earth orbits. The system architecture is based on a multistage optical amplifier seeded by a directly modulated DFB laser diode. The average optical power generated by the system is >6 W with diffraction limited beam quality and the beacon signal will be transmitted via a subaperture of the station main telescope. The beacon will be installed at IZN-1 and perform first LEO Direct-to-Earth optical communication links at the beginning of 2022.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122720565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749719
C. W. Korevaar, J. Boschma, R. den Breeje, J. Ebert
Optical feeder links (OFLs) benefit from the vast amount of bandwidth available in the THz-regime of the electro-magnetic spectrum, and could enable future terabit-per-second satellite systems. This study assesses the end-to-end performance of analog coherent OFLs for digital video broadcasting (DVB) applications, employing phase modulation (PM) and double-sideband suppressed carrier (DSB-SC). Though both PM and DSB-SC suffer from non-linear distortion, we show that with DSB-SC the optical modulation index can be reduced such that the modulator is operated in the linear regime, without sacrificing the signal-to-noise ratio (SNR). Using end-to-end simulations of a geostationary orbit (GEO) feeder link the Es/N0 penalty due to the optical feeder link (OFL) is determined. With typical system parameters and link losses the OFL-induced penalty remains below 1 dB, even under moderate turbulence conditions and APSK32 (8/9). As a result, the usual suspects, the RF traveling-wave tube amplifier (TWTA) and the RF user channel, remain the key limiting factors for the end-to-end performance.
{"title":"End-to-End Performance Analysis of Analog Coherent Optical Satellite Feeder Links","authors":"C. W. Korevaar, J. Boschma, R. den Breeje, J. Ebert","doi":"10.1109/icsos53063.2022.9749719","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749719","url":null,"abstract":"Optical feeder links (OFLs) benefit from the vast amount of bandwidth available in the THz-regime of the electro-magnetic spectrum, and could enable future terabit-per-second satellite systems. This study assesses the end-to-end performance of analog coherent OFLs for digital video broadcasting (DVB) applications, employing phase modulation (PM) and double-sideband suppressed carrier (DSB-SC). Though both PM and DSB-SC suffer from non-linear distortion, we show that with DSB-SC the optical modulation index can be reduced such that the modulator is operated in the linear regime, without sacrificing the signal-to-noise ratio (SNR). Using end-to-end simulations of a geostationary orbit (GEO) feeder link the Es/N0 penalty due to the optical feeder link (OFL) is determined. With typical system parameters and link losses the OFL-induced penalty remains below 1 dB, even under moderate turbulence conditions and APSK32 (8/9). As a result, the usual suspects, the RF traveling-wave tube amplifier (TWTA) and the RF user channel, remain the key limiting factors for the end-to-end performance.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121803154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749699
H. Kotake, Y. Abe, Mariko Sekiguchi, T. Fuse, Hioryuki Tsuji, M. Toyoshima
In this paper, we describe the link budget design of the adaptive optical satellite network (AOSN) for the integrated non-terrestrial network (NTN). Our target optical links include the inter-satellite links and the ground-to-satellite links using relay geostationary Earth orbit (GEO) satellites, relay low Earth orbit (LEO) satellites and relay high altitude platform stations (HAPS). We also utilize the receiver sensitivity of multi-level modulated optical signals using digital coherent detection. Furthermore, we also describe the link budget design considering various communication services, which include high reliability service data and standard service data. Our link budget design shows that the AOSN can handle various communication services by controlling various modulation schemes, wavelength division multiplexing (WDM) channels and multiple symbol rates.
{"title":"Link Budget Design of Adaptive Optical Satellite Network for Integrated Non-Terrestrial Network","authors":"H. Kotake, Y. Abe, Mariko Sekiguchi, T. Fuse, Hioryuki Tsuji, M. Toyoshima","doi":"10.1109/icsos53063.2022.9749699","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749699","url":null,"abstract":"In this paper, we describe the link budget design of the adaptive optical satellite network (AOSN) for the integrated non-terrestrial network (NTN). Our target optical links include the inter-satellite links and the ground-to-satellite links using relay geostationary Earth orbit (GEO) satellites, relay low Earth orbit (LEO) satellites and relay high altitude platform stations (HAPS). We also utilize the receiver sensitivity of multi-level modulated optical signals using digital coherent detection. Furthermore, we also describe the link budget design considering various communication services, which include high reliability service data and standard service data. Our link budget design shows that the AOSN can handle various communication services by controlling various modulation schemes, wavelength division multiplexing (WDM) channels and multiple symbol rates.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116440403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749742
Barry A. Matsumori, P. Searcy
The capability of FSO point-to-multipoint communications using BridgeComm's Managed Optical Communications Array (MOCA) technology has been presented including a general architecture of the terminal. What is worthy of further investigation are the technical and system operational impacts of a MOCA technology-based design for a specific application, namely for Low Earth Orbit (LEO) satellite constellations. Some of the benefits of MOCA technology have been cited including providing size, weight, operational volume, and power advantages relative to a mechanical gimbal for beam steering. However, there are capabilities extending beyond these parameters. This presentation will investigate the effect of MOCA technology on network management, network routing, and other aspects of the network as well as the satellite itself.
{"title":"An investigation into the technical and system operational impacts of applying FSO point-to-multipoint communications technology","authors":"Barry A. Matsumori, P. Searcy","doi":"10.1109/icsos53063.2022.9749742","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749742","url":null,"abstract":"The capability of FSO point-to-multipoint communications using BridgeComm's Managed Optical Communications Array (MOCA) technology has been presented including a general architecture of the terminal. What is worthy of further investigation are the technical and system operational impacts of a MOCA technology-based design for a specific application, namely for Low Earth Orbit (LEO) satellite constellations. Some of the benefits of MOCA technology have been cited including providing size, weight, operational volume, and power advantages relative to a mechanical gimbal for beam steering. However, there are capabilities extending beyond these parameters. This presentation will investigate the effect of MOCA technology on network management, network routing, and other aspects of the network as well as the satellite itself.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127540176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749702
R. T. Carlson
Optical intersatellite links (OISL), or laser communications (lasercom), offer 1 to 100+ Gbps data rates, with unequaled transmission security due to a laser beamwidth 100 to 1000 times narrower than an RF crosslink. As more high-value satellites are equipped with lasercom terminals, the space network lasercom architecture becomes more important. In this paper we propose a space lasercom crosslink architecture and wavelength-polarization plan for high-value satellites that enables lasercom terminal on-orbit reconfigurability for network robustness and flexible evolution. This lasercom reference architecture transmits and receives circularly polarized light, using three wavelengths separated by 5.6 nm on the ITU DWDM 50 GHz-grid. For resilient hardened networks, a different wavelength trio can be redefined before each link acquisition, anywhere in the 1538–1568 nm region suitable for the optical high power amplifier. We also present a reconfigurable optical bench design to realize maximum flexibility for intra or inter-network links, with resilience features for rapid crosslink establishment and robustness to hostile interference. Reconfigurable terminals also improve the network cost-effectiveness due to the connectivity flexibility. A brassboard reconfigurable optical bench reference design is being built at Aerospace Corp. The bench is $8.1^{primeprime} mathrm{x} 8.4^{primeprime} mathrm{x} 3.25^{primeprime}mathrm{H}$, with an opto-mechanical design compatible for 2″ to 8″ telescopes, 10,000-84,000 km link ranges, and 1 to 100+ Gbps. The architecture is TRK-on-COM, with a rapid-acquisition capability using a star fix. The brassboard will demonstrate tunability across the 1550 nm C-band, for the TX laser pair and also for the RX and TX filters. We will demonstrate > 130 dB isolation of the 10W transmit power to the ACQ-TRK focal plane array 1 picowatt pixels. We intend to make the lasercom optical bench design details available as a reference design for adoption or adaptation, and to provide prototype performance test results on a non-proprietary, non-exclusive basis to encourage network adoption and interoperability and space qualification activities.
{"title":"Architecture for Reconfigurable Next-Generation Lasercom Terminals","authors":"R. T. Carlson","doi":"10.1109/icsos53063.2022.9749702","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749702","url":null,"abstract":"Optical intersatellite links (OISL), or laser communications (lasercom), offer 1 to 100+ Gbps data rates, with unequaled transmission security due to a laser beamwidth 100 to 1000 times narrower than an RF crosslink. As more high-value satellites are equipped with lasercom terminals, the space network lasercom architecture becomes more important. In this paper we propose a space lasercom crosslink architecture and wavelength-polarization plan for high-value satellites that enables lasercom terminal on-orbit reconfigurability for network robustness and flexible evolution. This lasercom reference architecture transmits and receives circularly polarized light, using three wavelengths separated by 5.6 nm on the ITU DWDM 50 GHz-grid. For resilient hardened networks, a different wavelength trio can be redefined before each link acquisition, anywhere in the 1538–1568 nm region suitable for the optical high power amplifier. We also present a reconfigurable optical bench design to realize maximum flexibility for intra or inter-network links, with resilience features for rapid crosslink establishment and robustness to hostile interference. Reconfigurable terminals also improve the network cost-effectiveness due to the connectivity flexibility. A brassboard reconfigurable optical bench reference design is being built at Aerospace Corp. The bench is $8.1^{primeprime} mathrm{x} 8.4^{primeprime} mathrm{x} 3.25^{primeprime}mathrm{H}$, with an opto-mechanical design compatible for 2″ to 8″ telescopes, 10,000-84,000 km link ranges, and 1 to 100+ Gbps. The architecture is TRK-on-COM, with a rapid-acquisition capability using a star fix. The brassboard will demonstrate tunability across the 1550 nm C-band, for the TX laser pair and also for the RX and TX filters. We will demonstrate > 130 dB isolation of the 10W transmit power to the ACQ-TRK focal plane array 1 picowatt pixels. We intend to make the lasercom optical bench design details available as a reference design for adoption or adaptation, and to provide prototype performance test results on a non-proprietary, non-exclusive basis to encourage network adoption and interoperability and space qualification activities.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133233802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/ICSOS53063.2022.9749724
S. Sivasankaran, Clarence Liu, Moritz Mihm, A. Ling
Satellite nodes are an enabler of global quantum networks by overcoming the distance limitations of fiber and free-space links on ground. The design of quantum sources and receivers for satellites, however, is challenging in terms of size, weight, and power consumption, as well as mechanical and thermal stability. This is all the more true for cost-efficient nanosatellites such as the popular CubeSat platform standard. Here we report on the follow-up mission of SpooQy-1, a 3U CubeSat that successfully demonstrated the generation of polarization-entangled photons in orbit. The next iteration of the mission will showcase satellite-to-ground quantum key distribution based on a compact source of polarization-entangled photon-pairs, and we have recently completed the integration of a fully functional demonstrator as a milestone towards the flight model. We also briefly describe the design of the optical ground station that we are currently building in Singapore for receiving the quantum signal. We present the most important subsystems and illustrate the concept of operation.
{"title":"A CubeSat platform for space based quantum key distribution","authors":"S. Sivasankaran, Clarence Liu, Moritz Mihm, A. Ling","doi":"10.1109/ICSOS53063.2022.9749724","DOIUrl":"https://doi.org/10.1109/ICSOS53063.2022.9749724","url":null,"abstract":"Satellite nodes are an enabler of global quantum networks by overcoming the distance limitations of fiber and free-space links on ground. The design of quantum sources and receivers for satellites, however, is challenging in terms of size, weight, and power consumption, as well as mechanical and thermal stability. This is all the more true for cost-efficient nanosatellites such as the popular CubeSat platform standard. Here we report on the follow-up mission of SpooQy-1, a 3U CubeSat that successfully demonstrated the generation of polarization-entangled photons in orbit. The next iteration of the mission will showcase satellite-to-ground quantum key distribution based on a compact source of polarization-entangled photon-pairs, and we have recently completed the integration of a fully functional demonstrator as a milestone towards the flight model. We also briefly describe the design of the optical ground station that we are currently building in Singapore for receiving the quantum signal. We present the most important subsystems and illustrate the concept of operation.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132370853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749729
C. Fuchs, D. Giggenbach, R. M. Calvo, W. Rosenkranz
The application of free-space optical communication systems in satellite applications has gained increasing attention in recent years. Their high data rates and comparably low size, weight and power requirements make them an attractive solution to increase data throughput in a number of applications, such as for optical GEO feeder links with throughputs beyond 1 Tbit/s. In order to use free-space optical links in such application scenarios, a number of challenges must be overcome, such as link-blockage by clouds and, most importantly, impairments due to atmospheric turbulence. Transmitter diversity makes use of the fact that a spatial separation of about 1 m between two transmitters is sufficient to achieve decorrelated channels. When the transmitted signals are combined on receiver side, a diversity gain can be observed. However, typical transmitter diversity systems make use of different wavelengths to separate the diversity channels in order to avoid interference among those channels. This leads to increased system complexity and is bandwidth inefficient. The transmitter diversity scheme Phase-Division in Bit-Time is a novel concept to avoid interference among multiple channels by adding an additional phase modulation on transmitter side in a free-space optical communication system with intensity modulation and direct detection (IM/DD). It enables using the same wavelength and even the same laser source for multiple transmitters. Furthermore, it is similar to Alamouti's scheme known in RF communication systems, but does not require channel state information.
{"title":"Optical Transmitter Diversity With Phase-Division in Bit-Time","authors":"C. Fuchs, D. Giggenbach, R. M. Calvo, W. Rosenkranz","doi":"10.1109/icsos53063.2022.9749729","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749729","url":null,"abstract":"The application of free-space optical communication systems in satellite applications has gained increasing attention in recent years. Their high data rates and comparably low size, weight and power requirements make them an attractive solution to increase data throughput in a number of applications, such as for optical GEO feeder links with throughputs beyond 1 Tbit/s. In order to use free-space optical links in such application scenarios, a number of challenges must be overcome, such as link-blockage by clouds and, most importantly, impairments due to atmospheric turbulence. Transmitter diversity makes use of the fact that a spatial separation of about 1 m between two transmitters is sufficient to achieve decorrelated channels. When the transmitted signals are combined on receiver side, a diversity gain can be observed. However, typical transmitter diversity systems make use of different wavelengths to separate the diversity channels in order to avoid interference among those channels. This leads to increased system complexity and is bandwidth inefficient. The transmitter diversity scheme Phase-Division in Bit-Time is a novel concept to avoid interference among multiple channels by adding an additional phase modulation on transmitter side in a free-space optical communication system with intensity modulation and direct detection (IM/DD). It enables using the same wavelength and even the same laser source for multiple transmitters. Furthermore, it is similar to Alamouti's scheme known in RF communication systems, but does not require channel state information.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133804535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-28DOI: 10.1109/icsos53063.2022.9749703
A.W. Bernini, M. Fice, K. Balakier
As the demand for satellite data transmission increases, higher capacity optical links need to be developed to allow satellites to be connected directly to ground stations (GST). The advantages of Low Earth Orbit (LEO) direct-to-Earth links are smaller latency when compared to relay systems using Geostationary Orbit (GEO) satellites, i.e. LEO-to-GEO and GEO-to-GST, and an increased available bandwidth offered by the optical spectrum with respect to radio frequency (RF) which allows for much higher link capacity. The increase in data rate of optical satellite to ground links towards 100 Gbps will require implementing optical coherent transceivers with capability to compensate for Doppler shift and atmospheric channel impairments. An important figure of merit which needs to be carefully considered in a satellite system is the equipment power consumption. The power consumption of coherent receivers used for terrestrial applications is closely related to the bit rate, with a receiver back-end digital signal processing being responsible for the vast majority of the power consumed. In this paper we propose a hybrid approach to signal processing consisting of simplified digital and analogue elements allowing for significant power reduction. Moreover, one of the attractive aspects of the proposed approach is that it does not require an increased complexity for an increase in baud rate. It will be discussed that the analogue approach to the frequency and phase recovery would allow a saving of approximately 40% to 50% of power on the overall DSP block at baud rates between 10 Gbaud and 100 Gbaud.
{"title":"Low-power-consumption coherent receiver architecture for satellite optical links","authors":"A.W. Bernini, M. Fice, K. Balakier","doi":"10.1109/icsos53063.2022.9749703","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749703","url":null,"abstract":"As the demand for satellite data transmission increases, higher capacity optical links need to be developed to allow satellites to be connected directly to ground stations (GST). The advantages of Low Earth Orbit (LEO) direct-to-Earth links are smaller latency when compared to relay systems using Geostationary Orbit (GEO) satellites, i.e. LEO-to-GEO and GEO-to-GST, and an increased available bandwidth offered by the optical spectrum with respect to radio frequency (RF) which allows for much higher link capacity. The increase in data rate of optical satellite to ground links towards 100 Gbps will require implementing optical coherent transceivers with capability to compensate for Doppler shift and atmospheric channel impairments. An important figure of merit which needs to be carefully considered in a satellite system is the equipment power consumption. The power consumption of coherent receivers used for terrestrial applications is closely related to the bit rate, with a receiver back-end digital signal processing being responsible for the vast majority of the power consumed. In this paper we propose a hybrid approach to signal processing consisting of simplified digital and analogue elements allowing for significant power reduction. Moreover, one of the attractive aspects of the proposed approach is that it does not require an increased complexity for an increase in baud rate. It will be discussed that the analogue approach to the frequency and phase recovery would allow a saving of approximately 40% to 50% of power on the overall DSP block at baud rates between 10 Gbaud and 100 Gbaud.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114945012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Inter-Satellite Optical Wireless Communication (Is-OWC) is regarded as the best choice for satellite communication because of its large throughput, low transmission power and high immunity to interference. To increase the availability of Is-OWC, it is required to implement a communication scheme that realizes lower latency and handles more traffic. In this paper, we propose a new Is-OWC system that uses multi-layer satellite constellation that applies uplink Non-Orthogonal Multiple Access (NOMA) to achieve delay suppression and increased throughput. In our proposed scheme, to distribute packets and reduce queue delay in each satellite, each communication path is adapted to the distance between the terrestrial transmitter and receiver. Simulation results validate the performance of our NOMA model is better than that of the conventional OMA model. Furthermore, the results showed that the BER of our model is improved by introducing the original algorithm to optimize the transmission power and the allocated sub-band of each satellite for the NOMA transmission. As a result, comparison of the latency between the proposed model using LEO and MEO satellites and the conventional model using only LEO satellites, the proposed model realizes delay suppression. The difference between the two models becomes more significant as the number of sessions in the entire network increases.
{"title":"Multi-layer Constellation based Is-OWC employing NOMA","authors":"Wataru Tachikawa, Ajgaonkar Swarali Ashish, Kazutoshi Yoshii, Jiang Liu, S. Shimamoto","doi":"10.1109/icsos53063.2022.9749721","DOIUrl":"https://doi.org/10.1109/icsos53063.2022.9749721","url":null,"abstract":"Inter-Satellite Optical Wireless Communication (Is-OWC) is regarded as the best choice for satellite communication because of its large throughput, low transmission power and high immunity to interference. To increase the availability of Is-OWC, it is required to implement a communication scheme that realizes lower latency and handles more traffic. In this paper, we propose a new Is-OWC system that uses multi-layer satellite constellation that applies uplink Non-Orthogonal Multiple Access (NOMA) to achieve delay suppression and increased throughput. In our proposed scheme, to distribute packets and reduce queue delay in each satellite, each communication path is adapted to the distance between the terrestrial transmitter and receiver. Simulation results validate the performance of our NOMA model is better than that of the conventional OMA model. Furthermore, the results showed that the BER of our model is improved by introducing the original algorithm to optimize the transmission power and the allocated sub-band of each satellite for the NOMA transmission. As a result, comparison of the latency between the proposed model using LEO and MEO satellites and the conventional model using only LEO satellites, the proposed model realizes delay suppression. The difference between the two models becomes more significant as the number of sessions in the entire network increases.","PeriodicalId":237453,"journal":{"name":"2022 IEEE International Conference on Space Optical Systems and Applications (ICSOS)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125140581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：