Pub Date : 2014-12-19DOI: 10.1109/MWP.2014.6994513
T. Umezawa, T. Angkaew, T. Kawanishi
We report on a simulation investigation of the effects of signal lines and core pitch on RF and optical crosstalk in integrated photonic circuits, and we discuss the data rate with photonic circuit density in advanced modulation formats such as 64QAM.
{"title":"Data rate penalty for high-density photonic integrated circuits in advanced modulation formats","authors":"T. Umezawa, T. Angkaew, T. Kawanishi","doi":"10.1109/MWP.2014.6994513","DOIUrl":"https://doi.org/10.1109/MWP.2014.6994513","url":null,"abstract":"We report on a simulation investigation of the effects of signal lines and core pitch on RF and optical crosstalk in integrated photonic circuits, and we discuss the data rate with photonic circuit density in advanced modulation formats such as 64QAM.","PeriodicalId":220534,"journal":{"name":"Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meeting on","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114676373","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 : 2014-12-19DOI: 10.1109/MWP.2014.6994587
Katsuyuki Yamamoto, T. Kawai, A. Enokihara, T. Kawanishi
Optical single sideband (SSB) modulation can be realized by using a Mach-Zehnder (MZ) interferometer with the branch-line coupler (BC) circuit as a 90 degree hybrid. In this paper, a miniaturized configuration of the BC circuit with installed series capacitors of the inter-digital structure was designed onto an electro-optic (EO) crystal, LiNbO3, substrate. Compared with a conventional BC, an area of the miniaturized BC was reduced by about 60% and the operation as the 90 degree hybrid was confirmed at around 10 GHz. The BC circuit directly connected with modulation electrodes was designated onto an EO modulator substrate for a single input type optical SSB modulator with a compact configuration. In the experiment, the modulator was fabricated and the optical SSB signal with the sideband suppression ratio of more than 30 dB was observed using light-waves of the 1550 nm region.
{"title":"LiNbO3 optical SSB modulator using microwave branchline coupler miniaturized by inter-digital capacitors","authors":"Katsuyuki Yamamoto, T. Kawai, A. Enokihara, T. Kawanishi","doi":"10.1109/MWP.2014.6994587","DOIUrl":"https://doi.org/10.1109/MWP.2014.6994587","url":null,"abstract":"Optical single sideband (SSB) modulation can be realized by using a Mach-Zehnder (MZ) interferometer with the branch-line coupler (BC) circuit as a 90 degree hybrid. In this paper, a miniaturized configuration of the BC circuit with installed series capacitors of the inter-digital structure was designed onto an electro-optic (EO) crystal, LiNbO3, substrate. Compared with a conventional BC, an area of the miniaturized BC was reduced by about 60% and the operation as the 90 degree hybrid was confirmed at around 10 GHz. The BC circuit directly connected with modulation electrodes was designated onto an EO modulator substrate for a single input type optical SSB modulator with a compact configuration. In the experiment, the modulator was fabricated and the optical SSB signal with the sideband suppression ratio of more than 30 dB was observed using light-waves of the 1550 nm region.","PeriodicalId":220534,"journal":{"name":"Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meeting on","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131102681","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 : 2014-12-19DOI: 10.1109/MWP.2014.6994596
T. Umezawa, K. Akahane, N. Yamamoto, K. Inagaki, A. Kanno, T. Kawanishi
We have successfully realized the non-bias operation of an ultra-wide bandwidth uni-traveling-carrier photodetector (UTC-PD) using a low carrier concentration of 3 × 1014 cm-3 in the carrier collection layer for future high-density photonic integration. A 3-dB bandwidth above 110 GHz was confirmed without a bias circuit. In this paper, we discuss the proposed design and the experimental results obtained for the frequency response and maximum RF output power.
{"title":"Ultra-broadband UTC-PD beyond 110 GHz at 0 V for future photonic integration","authors":"T. Umezawa, K. Akahane, N. Yamamoto, K. Inagaki, A. Kanno, T. Kawanishi","doi":"10.1109/MWP.2014.6994596","DOIUrl":"https://doi.org/10.1109/MWP.2014.6994596","url":null,"abstract":"We have successfully realized the non-bias operation of an ultra-wide bandwidth uni-traveling-carrier photodetector (UTC-PD) using a low carrier concentration of 3 × 1014 cm-3 in the carrier collection layer for future high-density photonic integration. A 3-dB bandwidth above 110 GHz was confirmed without a bias circuit. In this paper, we discuss the proposed design and the experimental results obtained for the frequency response and maximum RF output power.","PeriodicalId":220534,"journal":{"name":"Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meeting on","volume":"38 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130937940","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 : 2014-12-19DOI: 10.1109/MWP.2014.6994510
T. Angkaew, T. Umezawa, T. Kawanishi
The fundamental crosstalk characteristics related to design of highly compact optical and RF signal lines has been studied in this work. The systematic investigation of the crosstalk of parallel waveguides are carried out by modal analysis and the beam propagation analysis. The new idea of crosstalk mitigation in PIC by using uniform air gap along the longitudinal structure has been proposed. The crosstalk mitigation up to - 40dB by using air gap can successfully achieve, which results in reduction of spacing between signal lines.
{"title":"Crosstalk reduction for large scale photonic integrated circuits","authors":"T. Angkaew, T. Umezawa, T. Kawanishi","doi":"10.1109/MWP.2014.6994510","DOIUrl":"https://doi.org/10.1109/MWP.2014.6994510","url":null,"abstract":"The fundamental crosstalk characteristics related to design of highly compact optical and RF signal lines has been studied in this work. The systematic investigation of the crosstalk of parallel waveguides are carried out by modal analysis and the beam propagation analysis. The new idea of crosstalk mitigation in PIC by using uniform air gap along the longitudinal structure has been proposed. The crosstalk mitigation up to - 40dB by using air gap can successfully achieve, which results in reduction of spacing between signal lines.","PeriodicalId":220534,"journal":{"name":"Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meeting on","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123471212","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 : 2014-12-19DOI: 10.1109/MWP.2014.6994535
T. Kuri, A. Kanno, T. Kawanishi
A wavelength-division-multiplexed (WDM) radio-over-fiber (RoF) de-multiplexer, which is specially designed for frequency-modulated continuous-wave (FM-CW) signal delivery systems, is newly developed. The characteristics of the developed de-multiplexer are described and then the de-multiplexing performances of 4-channel WDM 32-GHz-band and 8-channel WDM 48-GHz-band FM-CW RoF signals are evaluated with the de-multiplexer.
{"title":"Performance evaluation of wavelength division multiplexed radio-over-fiber de-multiplexer in frequency-modulated continuous-wave signal delivery systems","authors":"T. Kuri, A. Kanno, T. Kawanishi","doi":"10.1109/MWP.2014.6994535","DOIUrl":"https://doi.org/10.1109/MWP.2014.6994535","url":null,"abstract":"A wavelength-division-multiplexed (WDM) radio-over-fiber (RoF) de-multiplexer, which is specially designed for frequency-modulated continuous-wave (FM-CW) signal delivery systems, is newly developed. The characteristics of the developed de-multiplexer are described and then the de-multiplexing performances of 4-channel WDM 32-GHz-band and 8-channel WDM 48-GHz-band FM-CW RoF signals are evaluated with the de-multiplexer.","PeriodicalId":220534,"journal":{"name":"Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meeting on","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125924329","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 : 2014-12-19DOI: 10.1109/MWP.2014.6994516
Y. Takashima, Y. Maejima, H. Murata, Y. Okamura, A. Kanno, T. Kawanishi
A new millimeter-wave (MMW) signal generation device using a rectangular waveguide and second order nonlinear optical effect is proposed. Using a T-shaped rectangular waveguide with a suspended LiTaO3 crystal, adiabatic MMW signal injection into the waveguide is obtainable through optical difference frequency generation in the crystal. This device is easy for coupling to standard rectangular waveguide circuits compared with the proto-type devices where a nonlinear crystal is completely embedded into a rectangular waveguide. Analysis, design and preliminary experimental results are reported.
{"title":"Millimeter-wave signal generation device using optical difference frequency generation in LiTaO3 crystal suspended to rectangular waveguide","authors":"Y. Takashima, Y. Maejima, H. Murata, Y. Okamura, A. Kanno, T. Kawanishi","doi":"10.1109/MWP.2014.6994516","DOIUrl":"https://doi.org/10.1109/MWP.2014.6994516","url":null,"abstract":"A new millimeter-wave (MMW) signal generation device using a rectangular waveguide and second order nonlinear optical effect is proposed. Using a T-shaped rectangular waveguide with a suspended LiTaO3 crystal, adiabatic MMW signal injection into the waveguide is obtainable through optical difference frequency generation in the crystal. This device is easy for coupling to standard rectangular waveguide circuits compared with the proto-type devices where a nonlinear crystal is completely embedded into a rectangular waveguide. Analysis, design and preliminary experimental results are reported.","PeriodicalId":220534,"journal":{"name":"Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meeting on","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127432044","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 : 2014-10-01DOI: 10.1109/MWP.2014.6994594
Xiaodong Liang, Xi Liang, Yitang Dai, Kun Xu, Feifei Yin, Jiangqiang Li, Jintong Lin
We experimentally demonstrate the compensation of cross modulation distortion (XMD) nonlinearity which exists in wide-band, multiple-carrier analog photonic link (APL) systems. Such nonlinearity is caused by out-of-band signals due to the inherent nonlinear transfer function of Mach-Zehnder modulator (MZM). Instead of precisely emulating the transfer function of the whole nonlinear system in the digital domain, we digitally multiply the distorted signals by a compensating signal which can be extracted through a digital low-pass filtering. As a result, the XMD will be well suppressed. Theory analysis shows that only the bias angle should be known by the algorithm. By low biasing the MZM, the experiment shows a well-suppressed XMD, where the fundamental sidebands to XMD sidebands ratio is improved by more than 19 dB.
{"title":"Mitigation of cross-modulation distortion in wideband analog photonic link based on digital post-processing","authors":"Xiaodong Liang, Xi Liang, Yitang Dai, Kun Xu, Feifei Yin, Jiangqiang Li, Jintong Lin","doi":"10.1109/MWP.2014.6994594","DOIUrl":"https://doi.org/10.1109/MWP.2014.6994594","url":null,"abstract":"We experimentally demonstrate the compensation of cross modulation distortion (XMD) nonlinearity which exists in wide-band, multiple-carrier analog photonic link (APL) systems. Such nonlinearity is caused by out-of-band signals due to the inherent nonlinear transfer function of Mach-Zehnder modulator (MZM). Instead of precisely emulating the transfer function of the whole nonlinear system in the digital domain, we digitally multiply the distorted signals by a compensating signal which can be extracted through a digital low-pass filtering. As a result, the XMD will be well suppressed. Theory analysis shows that only the bias angle should be known by the algorithm. By low biasing the MZM, the experiment shows a well-suppressed XMD, where the fundamental sidebands to XMD sidebands ratio is improved by more than 19 dB.","PeriodicalId":220534,"journal":{"name":"Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meeting on","volume":"449 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115276955","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 : 2014-10-01DOI: 10.1109/MWP.2014.6994531
Can Cui, Duo Zhang, Jin-Dong Zhang, Wen Wu
A novel time division multiplexing of channel (TDMC) scheme for smart antenna is proposed. The scheme effectively reduces the number of radio frequency (RF) channels form N to one. In this scheme, each element is followed by an optical delay line with different time delays. The signals on different elements can pass through the only RF channel sequentially. Compared with other schemes, the TDMC can be used not only for the receiving but also for the transmitting. Design principles and correction method for recovery data with errors are given. Simulation results have validated the proposed scheme.
{"title":"A novel single RF channel scheme for smart antenna based on optical delay lines","authors":"Can Cui, Duo Zhang, Jin-Dong Zhang, Wen Wu","doi":"10.1109/MWP.2014.6994531","DOIUrl":"https://doi.org/10.1109/MWP.2014.6994531","url":null,"abstract":"A novel time division multiplexing of channel (TDMC) scheme for smart antenna is proposed. The scheme effectively reduces the number of radio frequency (RF) channels form N to one. In this scheme, each element is followed by an optical delay line with different time delays. The signals on different elements can pass through the only RF channel sequentially. Compared with other schemes, the TDMC can be used not only for the receiving but also for the transmitting. Design principles and correction method for recovery data with errors are given. Simulation results have validated the proposed scheme.","PeriodicalId":220534,"journal":{"name":"Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meeting on","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130373866","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 : 2014-10-01DOI: 10.1109/MWP.2014.6994534
Sun-Young Jung, Soo-Min Kang, Sang-Min Jung, Sang‐Kook Han
Sinc-shaped side-lobes of OFDM problematic in multi-services integrated optical network were effectively suppressed by employing FBMC. It is experimentally verified that signal performance and spectral efficiency of FBMC becomes better in comparison with OFDM in wired/wireless converged optical transmission.
{"title":"AMO-FBMC based RoF transmission for efficient wired/wireless converged optical networks","authors":"Sun-Young Jung, Soo-Min Kang, Sang-Min Jung, Sang‐Kook Han","doi":"10.1109/MWP.2014.6994534","DOIUrl":"https://doi.org/10.1109/MWP.2014.6994534","url":null,"abstract":"Sinc-shaped side-lobes of OFDM problematic in multi-services integrated optical network were effectively suppressed by employing FBMC. It is experimentally verified that signal performance and spectral efficiency of FBMC becomes better in comparison with OFDM in wired/wireless converged optical transmission.","PeriodicalId":220534,"journal":{"name":"Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meeting on","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123262893","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 : 2014-10-01DOI: 10.1109/MWP.2014.6994585
Sangsoo Lee, Seunghyun Cho, Jong Hyun Lee
Although there have been a lot of efforts to converge optical access network and mobile access network for reducing the CAPEX and OPEX of telecom operators, we are still seeking to ultimate cost-effective solution for merged access network architecture. So we introduced future-proof optical-mobile converged access network architectures based on integration of PON with RoF technologies and discussed their characteristics and possibility of realization.
{"title":"Future-proof optical-mobile converged access network based on integration of PON with RoF technologies","authors":"Sangsoo Lee, Seunghyun Cho, Jong Hyun Lee","doi":"10.1109/MWP.2014.6994585","DOIUrl":"https://doi.org/10.1109/MWP.2014.6994585","url":null,"abstract":"Although there have been a lot of efforts to converge optical access network and mobile access network for reducing the CAPEX and OPEX of telecom operators, we are still seeking to ultimate cost-effective solution for merged access network architecture. So we introduced future-proof optical-mobile converged access network architectures based on integration of PON with RoF technologies and discussed their characteristics and possibility of realization.","PeriodicalId":220534,"journal":{"name":"Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meeting on","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122791188","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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