光学

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あいりさわまつ
5 years ago
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1 LCOS Gridless Wavelength Selective Switch Based on LCOS Technology Yasuki SAKURAI To meet ever-increasing demand for network capacity, both the spectral e ciency and symbol rate carried by a single channel have been increasing dramatically. As a promising candidate, elastic optical path networks have been proposed as a spectrally e cient networking technology, which e ectively supports per-channel variable tra c demands. The elastic optical networks allow us to deal with the mix of various tra cs with arbitrarily variable symbol rates and modulation formats, which are not only 10 Gbps legacy channels but also core tra c channels over 400 Gbps. In such networks, bandwidth and frequency variable gridless wavelength selective switches play an important role. In this paper, we summarize recent network revolution due to elastic optical path networks and also report the performance of gridless wavelength selective switches based on LCOS technology. Key words: wavelength selective switch WSS, liquid crystal on silicon LCOS, reconfigurable optical add-drop multiplexer ROADM, gridless, di ractive optical element DOE QAM quadrature amplitude modulation OFDM orthogonal frequency division multiplexing 1 2 ITU-T International Telecommunication Union Telecommunication Standardization Sector WDM wavelength division multiplexing WDM WDM LCOS liquid crystal on silicon ROADM reconfigurable optical add/drop multiplexer LCOS WSS: wavelength selective switch 1. ROADM/WXC ROADM 1 ROADM/WXC santec ysakurai@santec-net.co.jp

2 1 ROADM 3 2 WSS 3 WXC ROADM/WXC WDM / add/drop WDM O/E optical/ electrical E/O 2 WSS 3 WXC WSS 2 6 WSS mux/demux WDM add/drop WDM Tx / Rx mux/ demux Tx/Rx 3 / QAM OFDM Gbps 1 Tbps Gbps 40 Gbps ROADM/WXC WSS ITU-T ROADM/WXC WDM WSS WDM 3 2. WSS ROADM/WXC WSS N 1 N 1 1 N 1 N mux/demux WDM demux, mux WDM WSS 4 WDM

LCOS LCOS DOE: di ractive optical element LCOS 238 20 DOE 5 LCOS LCOS ITO indium tin oxide CMOS complementary metal oxide semiconductor

3 5 LCOS 4 WSS WDM LC liquid crystal LCOS MEMS micro-electromechanical systems DMD digital mirror device 6 MEMS DMD LC LCOS MEMS LC WDM 1 DMD LCOS DMD on/o WSS LCOS ms DMD WSS 3. LCOS LCOS DOE: di ractive optical element LCOS DOE 5 LCOS LCOS ITO indium tin oxide CMOS complementary metal oxide semiconductor Si DOE DOE 2p rad LCOS d q 2p rad l q in q d h q in q d m l L 1 h sin p q p q 2 2 L d q 3 m L DOE DOE LCOS WSS WSS 2 WSS AR antireflecticve LCOS LCOS LCOS HDTV high definition televison 0 12 Vp-p 12 bit 8.0 mm 8.5 mm LCOS

4 8 1 4 WSS db LCOS DOE DOE WSS DOE L l Λ 1 π η exp jφ exp j 2 m x x dx 4 Λ Λ 0 F x DOE 8 DOE 2p rad 7 WSS 4. WSS 1 4 WSS C PDL polarization dependent loss 6.5 db 35 db 0.5 db 0 db mm WSS 1U

5 9 WSS 10 WSS 3 db TEC thermoelectric cooler TEC W LCOS TEC 10 W 9 WSS C GHz 0.5 db 3.0 db 45 GHz 38 GHz WDM WSS WSS 10 WSS 5 IL db 10 log exp ln 2 2 Dn BW 3 2n 5 Dn BW 3 n 3 db WSS 3 db m : 45.8 GHz / s : 0.43 GHz m : 0.09 GHz / s : 0.25 GHz WSS 3 db 10 WSS n db s 34 GHz WSS LCOS 11. WSS LCOS

6 1 M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, T. Yoshimatsu, T. Kobayashi, Y. Miyamoto, K. Yoneganaga, A. Takada, O. Ishida and S. Matsuoka: Demonstration of novel spectrume cient elastic optical path network with per-channel variable capacity of 40 Gb/s to over 400 Gb/s, Proc. of 34th European Conference on Optical Communication ECOC, Paper Th.3.F M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone and S. Matsuoka: Spectrum-e cient and scalable elastic optical path network: Architecture, benefits, and enabling technologies, IEEE Commun. Mag., P. Colbourne and B. Collings: ROADM switching technologies, Proc. of Optical Fiber Communication Conference and Exposition/National Fiber Optic Engineers Conference OFC/ NFOEC, Paper OTuD T. J. Xia, G. A. Wellbrock, Y. Huang, E. Ip, M. Huang, Y. Shao, T. Wang, Y. Aono, T. Tajima, S. Murakami and M. Cvijetic: Field experiment with mixed line-rate transmission 112-Gb/s, 450-Gb/s, and 1.15-Tb/s over 3,560 km of installed fiber using filterless coherent receiver and EDFas only, Proc. of Optical Fiber Communication Conference and Exposition/National Fiber Optic Engineers Conference OFC/NFOEC, Paper PDPA Y. Huang, E. Ip, P. N. Ji, Y. Shao, T. Wang, Y. Aono, Y. Yano and T. Tajima: Terabit/s optical superchannel with flexible modulation format for dynamic distance/route transmission, Proc. of Optical Fiber Communication Conference and Exposition/ National Fiber Optic Engineers Conference OFC/NFOEC, Paper OM3H P. Wall, P. Colbourne, C. Reimer and S. McLaughlin: WSS switching engine technologies, Proc. of Optical Fiber Communication Conference and Exposition/National Fiber Optic Engineers Conference OFC/NFOEC, Paper OWC E. G. Loewen and E. Popov: Di raction Gratings and Applications CRC Press, New York, 1997 pp J. Kelly: Application of liquid crystal technology to telecommunication devices, Proc. of Optical Fiber Communication Conference and Exposition/National Fiber Optic Engineers Conference OFC/NFOEC, Paper NThE LCOS 2012 C F. Heismann: System requirements for WSS filter shape in cascaded ROADM networks, Proc. of Optical Fiber Communication Conference and Exposition/National Fiber Optic Engineers Conference OFC/NFOEC, Paper OThR K. Sone, X. Wang, S. Oda, G. Nakagawa, Y. Aoki, I. Kim, P. Palacharla, T. Hoshida, M. Sekiya and J. C. Rasmussen: First demonstration of hitless spectrum defragmentation using real-time coherent receivers in flexible grid optical networks, Proc. of 38th European Conference on Optical Communication ECOC, Paper Th.3.D

膨張する幹線トラフィックに対応する超高速トランスポート

膨張する幹線トラフィックに対応する超高速トランスポート Ultra-High-Speed Core Transport to Handle Rapid Growth in Traffic 塩田昌宏横田泉菅谷靖斉藤成明荻原裕史あらまし 40 Gbps100 Gbps FLASHWAVE 9500FLASHWAVE S660 Abstract There has recently been a speed up of mobile traffic,