This paper proposes radio highway networks using optical CDMA Method. Gold codes is applied by using optical polarity reversed correlator. The received C/ ( N + I ) in the CS is theoretically analyzed in the proposed networks with two bus connection methods using optical switch and optical coupler.
{"title":"Radio Highway Networks Using Optical CDMA With Optical Polarity Reversed Correlator","authors":"Sangjo Park, K. Tsukamoto, S. Komaki","doi":"10.1109/MWP.1997.740268","DOIUrl":"https://doi.org/10.1109/MWP.1997.740268","url":null,"abstract":"This paper proposes radio highway networks using optical CDMA Method. Gold codes is applied by using optical polarity reversed correlator. The received C/ ( N + I ) in the CS is theoretically analyzed in the proposed networks with two bus connection methods using optical switch and optical coupler.","PeriodicalId":280865,"journal":{"name":"International Topical Meeting on Microwave Photonics (MWP1997)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130769632","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}
Simultaneous upconversion of several channels in nzm-wave subcarrier transmission systems is proposed. The technique is advanta,geous for optical backbones of wireless LANs at 60 GHz with numerous base stations. Low cross-talk was obtained in experiments. Introduction For future mobile broadband communiication systems or wireless LANs millimeter-wave (mm-wave) fiber links are increasingly considered as attractive solutions for signal distribution to the base stations. In recent years, different concepts have been proposed. Heterodyne techniques using two lasers need complex circuitry for suppressing phase noise. Resonantly modulated [ 11 or mode-locked [2] lasers are other solutions for optical generation of mm-waves, where dual-mode devices [3] are preferable. In [4] two correlated subcarriers were generated by externally modulating a single laser diode and suppressing the carrier, resulting in detection of twice the modulation frequency. Furthermore, direct signal modulation of a laser diode and upconversion of the signal by an external modulator has been demonstrated 151. All techniques discussed so far concentrate on the generation of mm-wave subcarriers of a single channel. However, for a coinmunication system at 60 GHz 161 we propose upconversion of many baseband signals simultaneously with a single external modulator using a dense wavelength division mulliplex (WDM) system. The upconverted signals can easily have different subcarrier frequencies being required for a frequency division multiplexed (FDM) communication system. Furthermore, we propose the use of a phase inodulator and simple dispersion management instead of a IClach-Zehnder intensity modulator. This results in a 6-dB-imlprovement of the signal dletected [7]. Hence, the system proposed is well-suited for efficient upconversion of many downlink signals in a communication system at mm-wave frequencies. System Concept The concept for simultaneous upconversion of many subcarriers with a single external modulator is shown in Fig. 1. Basically, a dense wavelength division multiplexed (WDM) system is used for multiplexing many carriers at different waveliengths into a fiber bus. These signals are generated by laser diodes being available at well-defined emission wavelengths for dense WDM systems. Each laser with its emission wavelength is assigned to a certain base station and is modulat.ed with the corresponding datas in the baseband or at an intermediate frequency. By choosing different intermediate frequencies for different
{"title":"Simultaneous Upconversion Of Several Channels In MM-Wave Subearrier Transmission Systems for Wireless LANs at 60 GHz","authors":"M. Sauer, W. Nowak","doi":"10.1109/MWP.1997.740259","DOIUrl":"https://doi.org/10.1109/MWP.1997.740259","url":null,"abstract":"Simultaneous upconversion of several channels in nzm-wave subcarrier transmission systems is proposed. The technique is advanta,geous for optical backbones of wireless LANs at 60 GHz with numerous base stations. Low cross-talk was obtained in experiments. Introduction For future mobile broadband communiication systems or wireless LANs millimeter-wave (mm-wave) fiber links are increasingly considered as attractive solutions for signal distribution to the base stations. In recent years, different concepts have been proposed. Heterodyne techniques using two lasers need complex circuitry for suppressing phase noise. Resonantly modulated [ 11 or mode-locked [2] lasers are other solutions for optical generation of mm-waves, where dual-mode devices [3] are preferable. In [4] two correlated subcarriers were generated by externally modulating a single laser diode and suppressing the carrier, resulting in detection of twice the modulation frequency. Furthermore, direct signal modulation of a laser diode and upconversion of the signal by an external modulator has been demonstrated 151. All techniques discussed so far concentrate on the generation of mm-wave subcarriers of a single channel. However, for a coinmunication system at 60 GHz 161 we propose upconversion of many baseband signals simultaneously with a single external modulator using a dense wavelength division mulliplex (WDM) system. The upconverted signals can easily have different subcarrier frequencies being required for a frequency division multiplexed (FDM) communication system. Furthermore, we propose the use of a phase inodulator and simple dispersion management instead of a IClach-Zehnder intensity modulator. This results in a 6-dB-imlprovement of the signal dletected [7]. Hence, the system proposed is well-suited for efficient upconversion of many downlink signals in a communication system at mm-wave frequencies. System Concept The concept for simultaneous upconversion of many subcarriers with a single external modulator is shown in Fig. 1. Basically, a dense wavelength division multiplexed (WDM) system is used for multiplexing many carriers at different waveliengths into a fiber bus. These signals are generated by laser diodes being available at well-defined emission wavelengths for dense WDM systems. Each laser with its emission wavelength is assigned to a certain base station and is modulat.ed with the corresponding datas in the baseband or at an intermediate frequency. By choosing different intermediate frequencies for different","PeriodicalId":280865,"journal":{"name":"International Topical Meeting on Microwave Photonics (MWP1997)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121140522","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}
Tunable millimeter wave generation by photomixing one TE and one TM longitudinal mode of a dual-polarization external cavity diode laser is presented. Data transmission at 140 Mbit/s onto a 60 GHz beat carrier is demonstrated by externally modulating one of the modes. Introduction Optical mixing of two laser modes is a straight-forward technique for the generation of millimeter waves. Potential applications of this method include optoelectronic metrology such as the characterization of high-speed electronic and photonic devices [l] and signal transmission at millimeter wave carrier frequencies via fibers [2,3]. Here, we report on the generation of millimeter waves and their use for data transmission by means of beating the two modes of a dual-polarization emitting external cavity diode laser (ECDL). This technique offers the advantage of narrow free-running mode linewidths, a wide beat frequency tuning range potential up to several THz, and an easy separation of the two modes for external modulation and control. Generation of tunable millimeter waves The experimental setup of the dual-polarization ECDL is shown in Fig. 1 [4]. The laser diode is of a 1.55pm InGaAsPflnP ridge-waveguide structure designed for having a polarization-insensitive modal gain. In order to achieve optimum coupling between the active device and the two external resonators, a two-layer AR-coating was applied on one facet. Its output emission is collimated, subsequently split in a polarization beam splitter (PBS 1) and diffracted back by two 1200 l/mm gratings forming a mode and polarization-selective twoarm external cavity. In order to be able to adjust the feedback levels of the two modes corresponding to the two arms, variable attenuators were inserted. The laser output of the uncoated facet is coupled to a lens-ended polarization maintaining fiber (PMF) and subsequently split in PBS2 for power monitoring and recombined for the detection by a monochromator (M), a Fabry-Perot spectrum analyzer (FP-SA) and a fast photodetector (PD) When the two spectral modes are mixed in the fast photodetector a distinct line at the beat frequency between the two modes is observed in the RF-spectrum. The beat note detection with a preceding polarization filter.
{"title":"Optical Millimeter Wave Generation And Data Transmission Using A Dual-polarization Emission External Cavity Diode Laser","authors":"S. Pajarola, G. Guekos","doi":"10.1109/MWP.1997.740230","DOIUrl":"https://doi.org/10.1109/MWP.1997.740230","url":null,"abstract":"Tunable millimeter wave generation by photomixing one TE and one TM longitudinal mode of a dual-polarization external cavity diode laser is presented. Data transmission at 140 Mbit/s onto a 60 GHz beat carrier is demonstrated by externally modulating one of the modes. Introduction Optical mixing of two laser modes is a straight-forward technique for the generation of millimeter waves. Potential applications of this method include optoelectronic metrology such as the characterization of high-speed electronic and photonic devices [l] and signal transmission at millimeter wave carrier frequencies via fibers [2,3]. Here, we report on the generation of millimeter waves and their use for data transmission by means of beating the two modes of a dual-polarization emitting external cavity diode laser (ECDL). This technique offers the advantage of narrow free-running mode linewidths, a wide beat frequency tuning range potential up to several THz, and an easy separation of the two modes for external modulation and control. Generation of tunable millimeter waves The experimental setup of the dual-polarization ECDL is shown in Fig. 1 [4]. The laser diode is of a 1.55pm InGaAsPflnP ridge-waveguide structure designed for having a polarization-insensitive modal gain. In order to achieve optimum coupling between the active device and the two external resonators, a two-layer AR-coating was applied on one facet. Its output emission is collimated, subsequently split in a polarization beam splitter (PBS 1) and diffracted back by two 1200 l/mm gratings forming a mode and polarization-selective twoarm external cavity. In order to be able to adjust the feedback levels of the two modes corresponding to the two arms, variable attenuators were inserted. The laser output of the uncoated facet is coupled to a lens-ended polarization maintaining fiber (PMF) and subsequently split in PBS2 for power monitoring and recombined for the detection by a monochromator (M), a Fabry-Perot spectrum analyzer (FP-SA) and a fast photodetector (PD) When the two spectral modes are mixed in the fast photodetector a distinct line at the beat frequency between the two modes is observed in the RF-spectrum. The beat note detection with a preceding polarization filter.","PeriodicalId":280865,"journal":{"name":"International Topical Meeting on Microwave Photonics (MWP1997)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116020598","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}
Mixing microwave frequencies with optical devices has many applications in communication systems with fiber-optic links, to upconvert or downconvert the RF signal frequency for transmission or receiver processing respectively. Generally, mixing is achieved by the use of optical intensity modulators (laser diodes or external optical modulators) in different configurations : one modulator working in a non-linear regime or two cascaded modulators biased at quadrature [l, 21. We study here another technique using a frequency modulated semiconductor 1 aser and an interferometer to convert frequency modulation into intensity modulation [3]. We investigate two specific interferometers, a Mach-Zehnder and a Fabry-Perot. The performances of these two systems are compared in terms of conversion Loss, bandwidth .... Experimental results that demonstrate the validity of the theoretical analysis are reported with a Michelson interferometer.
{"title":"Optical Microwave Mixing By FM/AM Conversion With Different Interferometers","authors":"G. Maury, B. Cabon","doi":"10.1109/MWP.1997.740253","DOIUrl":"https://doi.org/10.1109/MWP.1997.740253","url":null,"abstract":"Mixing microwave frequencies with optical devices has many applications in communication systems with fiber-optic links, to upconvert or downconvert the RF signal frequency for transmission or receiver processing respectively. Generally, mixing is achieved by the use of optical intensity modulators (laser diodes or external optical modulators) in different configurations : one modulator working in a non-linear regime or two cascaded modulators biased at quadrature [l, 21. We study here another technique using a frequency modulated semiconductor 1 aser and an interferometer to convert frequency modulation into intensity modulation [3]. We investigate two specific interferometers, a Mach-Zehnder and a Fabry-Perot. The performances of these two systems are compared in terms of conversion Loss, bandwidth .... Experimental results that demonstrate the validity of the theoretical analysis are reported with a Michelson interferometer.","PeriodicalId":280865,"journal":{"name":"International Topical Meeting on Microwave Photonics (MWP1997)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128440189","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}
The concept of a THz source based on laser mixing is presented. A radiated power of 1OOpUW can be generated at 1-3 THz from laser powers of 25 mW if a photo detector with a bandwidth efficiency product of 360 GHz can be fabricated.
{"title":"THz Source Based On Laser Mixing","authors":"IJ. GIiese","doi":"10.1109/MWP.1997.740233","DOIUrl":"https://doi.org/10.1109/MWP.1997.740233","url":null,"abstract":"The concept of a THz source based on laser mixing is presented. A radiated power of 1OOpUW can be generated at 1-3 THz from laser powers of 25 mW if a photo detector with a bandwidth efficiency product of 360 GHz can be fabricated.","PeriodicalId":280865,"journal":{"name":"International Topical Meeting on Microwave Photonics (MWP1997)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128564270","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}
This paper presents a discussion of two numerical techniques and a description of their use for modelling electromagnetic wave propagation and charge carrier effects present in high-speed optoelectronic devices and circuits. The Method of Lines is used to compute the microwave and optical mode propagation characteristics of optoelectronic circuits while the Monte Carlo Method is used to simulate charge carrier 'trans port phenomena in devices. Results are presented to to demonstrate the power of these rigorous numerical modelling tools.
{"title":"Modelling Microwave Optical And Charge Carrier Effects In High-speed Optoelectronic Devices And Circuits Using The Method Of Lines And The Monte Carlo Method","authors":"P. Berini, M. Abou-Khalil, K. Wu","doi":"10.1109/MWP.1997.740272","DOIUrl":"https://doi.org/10.1109/MWP.1997.740272","url":null,"abstract":"This paper presents a discussion of two numerical techniques and a description of their use for modelling electromagnetic wave propagation and charge carrier effects present in high-speed optoelectronic devices and circuits. The Method of Lines is used to compute the microwave and optical mode propagation characteristics of optoelectronic circuits while the Monte Carlo Method is used to simulate charge carrier 'trans port phenomena in devices. Results are presented to to demonstrate the power of these rigorous numerical modelling tools.","PeriodicalId":280865,"journal":{"name":"International Topical Meeting on Microwave Photonics (MWP1997)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128743142","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}
{"title":"Passive Picocell - Prospects For Increasing The Radio Range","authors":"D. Wake, D. Moodie","doi":"10.1109/MWP.1997.740278","DOIUrl":"https://doi.org/10.1109/MWP.1997.740278","url":null,"abstract":"","PeriodicalId":280865,"journal":{"name":"International Topical Meeting on Microwave Photonics (MWP1997)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122223234","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}
E. Avrutin, J. Marsh, J. Arnold, T. Krauss, H. Pottinger, Richard M. De La Rue
The authors analyse harmonic mode-locking at (sub)terahertz frequencies in linear Fabry-Perot compound-cavity laser diodes (theoretically), and in ring structures (experimentally and theoretically) and compare these lasers with other constructions used for harmonic mode-locking.
{"title":"Analysis Of Harmonic (Sub-)THz Passive Mode Locking in Monolithic Compound Cavity Fabry-Perot and Ring Laser Diodes","authors":"E. Avrutin, J. Marsh, J. Arnold, T. Krauss, H. Pottinger, Richard M. De La Rue","doi":"10.1109/MWP.1997.740223","DOIUrl":"https://doi.org/10.1109/MWP.1997.740223","url":null,"abstract":"The authors analyse harmonic mode-locking at (sub)terahertz frequencies in linear Fabry-Perot compound-cavity laser diodes (theoretically), and in ring structures (experimentally and theoretically) and compare these lasers with other constructions used for harmonic mode-locking.","PeriodicalId":280865,"journal":{"name":"International Topical Meeting on Microwave Photonics (MWP1997)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129147926","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}
F. Hopfer, M. Schulze, D. Huhse, H. Scholl, H. Burkhard, V. Piataev, D. Bimberg
{"title":"Ultra High Repetition Rate (20.. 2000 GHz) Optical Pulse Generation","authors":"F. Hopfer, M. Schulze, D. Huhse, H. Scholl, H. Burkhard, V. Piataev, D. Bimberg","doi":"10.1109/MWP.1997.740224","DOIUrl":"https://doi.org/10.1109/MWP.1997.740224","url":null,"abstract":"","PeriodicalId":280865,"journal":{"name":"International Topical Meeting on Microwave Photonics (MWP1997)","volume":"86 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121222686","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}
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