Photonic Systems. WDM Wavelength Division Multiplexing. WDM 40 GbpsWDM WDM. Abstract

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Elmer Bryant
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Photonic Systems 21 WDM Wavelength Division Multiplexing WDM 40 GbpsWDM WDM Abstract The information society of the

cost, as represented by wavelength division multiplexing (WDM) systems.

It describes recent research on technologies for 40 Gbps WDM systems for the next-generation ultralarge-capacity

1 Photonic Systems 21 WDM Wavelength Division Multiplexing WDM 40 GbpsWDM WDM Abstract The information society of the 21st century requires powerful communication networks that allow information to be freely exchanged irrespective of time or location. Photonic technology is suitable for such networks due to its large capacity, flexibility, expandability, and low cost, as represented by wavelength division multiplexing (WDM) systems. This paper introduces terabit WDM systems and the optical amplifying technology used in them. It describes recent research on technologies for 40 Gbps WDM systems for the next-generation ultralarge-capacity high-speed systems, terabit submarine WDM systems, and ultra-long-reach terrestrial WDM systems. It also outlines optical signal processing technology that will allow optical signals to be used without conversion in future all optical networks. FUJITSU.52, 4, p (07,2001) 299

2 21 IMT-2000 IPv6 e- WDM Wavelength Division Multiplexing Gbps Gbps (1) 40 Gbps WDMWDM WDM 10 Gbps 176 WDM 10 Gbps Tbps WDM FLASHWAVE OADX 25 db 100 km 6 span (2) WorldCom Terabit Challenge km 1.76 Tbps 1 C/Lband 2 3 C/L-band DRA Distributed Raman Amplification 4 ITU-T G.975 FEC Forward Error Correction km 1,000 km 4,000 kmwdm 10 Gbps Tbps SMF Single Mode Fiber 1,680 km120 km -1 (3) C-band L-band 50 GHz OOB-FEC Out of Band- FEC Gbps NRZ SMF km 3 60 km 1 1,680 km C/L-band DRA DRA SNR OOB-FEC BER Bit Error Rate Gbps Gbps 40 Gbps WDM Gbps IC 40 Gbps FUJITSU.52, 4, (07,2001)

10.66 Gbps 128 ch. 送信部 1.55μm 帯 64 ch Ch.1 Ch.64 光ポストアンプ SMF 60 km 受信部光プリアンプ Ch.1 Ch.64 1.58μm 帯 64 ch Ch.65 Ch.128 波長合波器光スイッチ (AOM) 1.4μm 波長分波器 Ch.65 Ch.128 SMF 60 km 分布ラマン増幅器光増幅器 1.

) 1,530 1,535 1,540 1,545 1,550 1,555 1,560 1,565 波長 (nm) 1,570 1,575 1,580 1,585 1,590 1,595 1,600 1,605 波長 (nm) -1 10 Gbps 128 SMF1,680 km Fig.

3 dbm @20 db-down SPM 108 GHz 180 GHz 165 GHz 70 GHz 10.6 dbm 13.0 dbm 13.0 dbm 7.

3 10.66 Gbps 128 ch. 送信部 1.55μm 帯 64 ch Ch.1 Ch.64 光ポストアンプ SMF 60 km 受信部光プリアンプ Ch.1 Ch μm 帯 64 ch Ch.65 Ch.128 波長合波器光スイッチ (AOM) 1.4μm 波長分波器 Ch.65 Ch.128 SMF 60 km 分布ラマン増幅器光増幅器 1.55μm 帯 #1 SMF #2 SMF #5 120 km 120 km 1.58μm 帯 1.4μm 1.4μm 1.4μm 励起レーザ分散補償器帯域分離カプラ帯域合波カプラ 1.55 μm 帯 1.58 μm 帯光強度 (5 db/div.) 光強度 (5 db/div.) 1,530 1,535 1,540 1,545 1,550 1,555 1,560 1,565 波長 (nm) 1,570 1,575 1,580 1,585 1,590 1,595 1,600 1,605 波長 (nm) Gbps 128 SMF1,680 km Fig.1-10 Gbps 128 ch SMF 1,680 km transmission experiment Gbps NRZ Conventional RZ RZ CS-RZ 110 ps/nm 40 ps/nm 50 ps/nm 340 ps/nm 30.5 dbm 32.3 dbm 32.0 dbm 27.3 db-down SPM 108 GHz 180 GHz 165 GHz 70 GHz 10.6 dbm 13.0 dbm 13.0 dbm 7.7 dbm OTDM Optical Time-Division Multiplexing 20 GHz 40 Gbps LiNbO 3 OTDM 40 Gbps (4),(5) 40 Gbps NRZ Non-Return-to-Zero InP HEMT SiGe HBT 40 Gbps SPM Self-Phase Modulation XPM Cross-Phase Modulation FWM Four-Wave Mixing PMD Polarization-Mode Dispersion 40 Gbps PMD 1 40 Gbps NRZ RZ RZ CS-RZ (6),(7) -1 FUJITSU.52, 4, (07,2001) 301

4 光サーキュレータライン焦点レンズ分散補償量 : 正平行移動負コリメータレンズ焦点レンズ VIPAガラス板 3 次元ミラー送信光波形伝送後 -800 ps/nm 分散補償後 1,530 nm 1,545 nm 1,560 nm Gbps VIPA Fig.2-40 Gbps VIPA variable dispersion compensator. RZ CS-RZ WDM WDM NRZ 40 Gbps 2 40 Gbps10 Gbps DCF -2 VIPA Virtually Imaged Phased Array (8) 3 40 Gbps NRZ C-band 800 ps/nm (9) (10) 3 PMD PMD PMD 40 GbpsPMD PMD PMD PMD PMD PMD PMD 40 Gbps PMD -3 (10),(11) PMD fast slow PMF Polarization Maintained Fiber 1 PMD PMD 40 Gbps 20 GHz 302 FUJITSU.52, 4, (07,2001)

5 20 GHz 成分強度 (arb.units) 光ポストアンプ 40 Gbps 光送信機 PMD モニタ実験高 PMD ファイバ理論伝送路の群遅延時間差 (ps) PMD 補償器偏波制御器 λ/4 板 λ/2 板偏波保持ファイバフィードバック制御補償前光プリアンプ Gbps PMD Fig.3-40 Gbps automatic PMD compensation experiment. 40 Gbps 光受信機 PMDモニタ BPF ハワー PD メータ 20 GHz 補償後ハソコン横軸 :10 ps/div. PMD PMD +D ファイハ -D ファイハ WDM カフラ分波器 1,550 nm 帯光ファイバ増幅器合波器ラマン増幅 WDM 1 Tbps 10,000 km (12) ,000 1 S/N 50 km 7,200 km (13) 1 10 Gbps Tbps 1 励起 LD. 1,580 nm 帯光ファイバ増幅器 -4 Fig.4-Optical fiber amplifier for WDM systems. 6,500 km 50 km 80 km WDM ,550 nm/1,580 nm 37.5 GHz 0.3 nm1,550 nm 103 FUJITSU.52, 4, (07,2001) 303

6 30.6 nm 33.8 nm EDFA 強度 (10 db/div.) TDFA GS-TDFA FRA GS-EDFA 1,530 1,550 1,570 1,590 1,610 波長 (nm) ( 分解能 :0.1 nm) -5 Fig.5-Optical spectrum after transmission. 1,580 nm D -4 D 64 nm 8 THz Tbps 7,200 km km Gbps Gbps (14) 1 1,550 nm C-band EDFA Er Doped Fiber Amplifier 1,580 nm L-band GS-EDFA Gain Shifted EDFA 70 nm 176 S + -band S-band C-band L-band L + -band 1,450 1,490 1,530 1,570 1,610 1,650 波長 (nm) EDFA Erbium Doped Fiber Amplifier GS-EDFA Gain Shifted EDFA TDFA Thulium Doped Fiber Amplifier FRA Fiber Raman Amplifier -6 Fig.6-Optical fiber amplifier for each band. C-band Lband C-bandS-band S -bandl-band L -band -6 EDFA TDFA Tm Doped Fiber Amplifier S-band S -band (15),(16) EDFA TDFA TDFA FRA Fiber Raman AmplifierFRA nm ( 1) 60 nm FRA S -band L -band (17),(18) FUJITSU.52, 4, (07,2001)

7 FRA FRA EDFA S-band EDFA S-band 2 DRA Distributed Raman Amplifier 1,000 km (19) DRA EDFA db DRA S/N (20) 3R ( 2) 3R WDM WDM (21) WDM ( 3) SC WDM 20 GHz 20 (22) -8 WDM SC SC 出力増幅媒体 [ 石英ファイバ ] 励起光 1 励起光 2 WDM 入力信号光中継器 / 光ノード光クロック再生光フィルタスーハーコンティニューム EDFA 光 3R/ 光 ADM 非線形ファイハ AWGフィルタ WDM 出力信号励起光 1 励起光 2 ラマン利得 1 ラマン利得 2-8 WDM Fig.8-Configuration of simultaneous WDM regenerator. ~100 nm 利得帯域幅 -7 Fig.7-Principle of fiber Raman amplifiers. 波長 2 ReamplificationRetiming Reshaping 3 3 Self-phase modulation SPM FUJITSU.52, 4, (07,2001) 305

光電力 (dbm) 10 0-10- -20- -30-17 nm AWG Arrayed Waveguide Grating WDM WDM 20 Gbps -10 a WDM 20 GHz -9 17 nm SC100 GHz AWG SC20 20 GHz WDM 0.6 ps SC 20-10 20 3R SC WDM C-band WDM 1.

8 光電力 (dbm) nm AWG Arrayed Waveguide Grating WDM WDM 20 Gbps -10 a WDM 20 GHz nm SC100 GHz AWG SC20 20 GHz WDM 0.6 ps SC R SC WDM C-band WDM ,530 1,540 1,550 1,560 1,570 波長 (nm) タイミンクシッタ (ps) -9 SC スペクトル 20 GHz クロックのタイミングジッタ Fig.9-SC spectrum and timing jitter for recovered 20 GHz optical clocks. Res.: 1.0 nm. 3R WDM RZ ADM WDM SC WDM a FUJITSU Vol.50 No.4 p FUJITSU Vol.51 No.6 p K. Nakamura et al Tbit/s Transmission over 1680 km Standard SMF with 120 km Optical Repeater Spacing Employing Distributed Raman Amplification OECC2000 Post-Deadline Papers PD G. Ishikawa et al. 80-Gb/s (2 40 Gb/s) Transmission Experiments over 667-km Dispersion-Shifted Fiber using Ti:LiNbO 3 OTDM Modulator and Demultiplexer ECOC 96 Post-Deadline Papers ThC FUJITSU Vol.48 No.5 p b Gbps a および 20 GHz クロック b Fig.10-Waveform for input 20 Gbps signal, (a), and recovered 20 GHz optical clock, (b). H: 25 ps/div. TDM O plus E Vol FUJITSU.52, 4, (07,2001)

9 No.1 p in optics and photonics vol.30 p Y. Akiyama et al. A Comparison of Performance in 40-Gbit/s NRZ, RZ, CS-RZ, and Optical Duobinary Modulation Schemes OECC/IOOC2001 OR.TueI T. Kasamatsu et al. Laser-diode-pumped highlyefficient gain shifted thulium-doped fiber amplifier operating in the nm band Technical digest of Fiber communication conference TuQ4 March M. Shirasaki Virtually Imaged Phased Array 17 A. B. Puc et al. Long-haul WDM NRZ transmission FUJITSU Sci. Tech. J. Vol.35 No.1 p M. Shirasaki et al. Variable Dispersion Compensator using The Virtually Imaged Phased Array (VIPA) for 40-Gbit/s WDM Transmission Systems ECOC2000 Post- Deadline Papers H. Hamano et al. High-Speed Optical Transmission Systems FUJITSU Sci. Tech. J. Vol.35 No.1 p H. Ooi et al. Automatic Polarization-Mode Dispersion Compensation in 40-Gbit/s Transmission OFC/IOOC 99 WE T. Naito et al. 1 Terabit/s WDM Transmission over 10,000 km ECOC '99 PD T. Tanaka et al. 2.1-Tbit/s WDM Transmission over 7,221 km with 80-km repeater spacing. ECOC '2000 PD H. Nakamoto et al Tbit/s WDM transmission over 6,173 km using all Raman amplifier repeaters and super FEC SubOptic '2001 PDP T. Sakamoto et al. Gain-equalized thulium doped fiber amplifiers for 1460 nm-band WDM signals Trends at 10.7 Gb/s in S-bnad using cascade of lumped Raman amplifiers Technical digest of Fiber communication conference PD m2000 B T. Terahara et al. 128 x Gbit/s transmission over 840-km standard SMF with 140-km optical repeater spacing 30.4-dB loss employing dual-band distributed Raman Amplification Technical digest of Fiber communication conference PD28 March M. Takeda et al. Active gain-tilt equalization by preferentially 1.43 m- or 1.48 m-pumped Raman amplification Trends in optics and photonics vol.30 p S. Watanabe et al. Interband wavelength conversion of 320 Gb/s 32 x 10 Gb/s WDM signal using a polarization insensitive fiber four-wave mixer ECOC '98 PD paper p F. Futami et al. Simultaneous recovery of 20 x 20 Gb/s WDM optical clocks using supercontinuum in a nonlinear fiber ECOC2000 PD paper PD FUJITSU.52, 4, (07,2001) 307

Next-Generation IP Platform Photonic Virtual Router

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