conference & convention enabling the next generation of networks & services Field PMD Measurements of a New 900-km Repeatered Submarine System Designed for Repeatered Submarine System Designed for 43 Gbps WDM Transmission Akihiko Matsuura NTT Network Service Systems Laboratories
conference & convention enabling the next generation of networks & services Presenter Profile Akihiko Matsuura was born in Toyama, Japan in 1969. He received his B. E. degree from the Tokyo University of Science in 1995, and the M. E. degree from Tokyo Institute of Technology in 1997. Since 1997 he has been with NTT Optical Since 1997 he has been with NTT Optical Network Systems Laboratories, where he researched 40 G optical transmission. From 2002 to 2010, he designed commercial 40-G WDM systems and submarine transmission systems. Akihiko Matsuura Email: matsuura.akihiko@lab.ntt.co.jp Tel: (+81) 46 859 4664
conference & convention enabling the next generation of networks & services Background 40-G based WDM transmission services - Supports the increase in IP traffic cost effectively - Commercially available in the last few years The main factor limiting 40 G transmission - PMD PMD impact on 40 G transmission must be assessed
conference & convention enabling the next generation of networks & services Outline Transmission design of newly installed 40-G based submarine system - 30 ch x 40-G submarine system design - 900-km Straight line transmission experiments - 900-km Straight line transmission experiments Field PMD measurements of repeatered submarine system - Measurement setup - Measured results Conclusions
conference & convention enabling the next generation of networks & services Newly Installed Submarine System Route length : We are here about 900 km (between Kyushu and Okinawa- Island) Island) Kyushu Kyushu Capacity : 80 ch x 10 G (initial capacity) 900 km 30 ch x 40 G (finally supported) Okinawa-Island
conference & convention enabling the next generation of networks & services 40 G System Design (S/N) Considering commercial technologies ... RZ-DPSK modulation format 100-GHz channel spacing Theoretical OSNR calculations ... Theoretical OSNR calculations ... 74-km mean repeater spacing RZ-DPSK, 100-GHz channel spacing #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 ... ... Okinawa- Kyushu inline amplifiers Island 74-km mean repeater spacing
conference & convention enabling the next generation of networks & services 40 G System Design (Nonlinear) By computer simulations ... 11 spans of NZ-DSF two spans of SMF for dispersion compensation From our previous RZ-DPSK research ... From our previous RZ-DPSK research ... (2-dB PMD penalty @ DGD = 9.2-ps) allowable PMD for transmission line = 2.6 ps land fiber NZ-DSF SMF ... allowable PMD 2.6 ps Okinawa- Kyushu Island
conference & convention enabling the next generation of networks & services Transmission Experiments TX spectrum monitor MUX post amp (next slide) LD 1 RZ-DPSK modulator LD 33 NZ-DSF SMF rep 1 rep 2 rep 6 rep 12 RZ-DPSK DEMUX demodulator (MZI) pre amp variable dispersion balanced compensator receiver RX spectrum monitor (next slide)
conference & convention enabling the next generation of networks & services Experimental Results PMD of entire transmission line = 0.3 ps mean received OSNR = 17.6 dB (@43 GHz optical bandwidth) nonlinear penalty = 1 dB nonlinear penalty = 1 dB TX RX power density power density [5 dB / div] [5 dB / div] 1528 1548 1568 1528 1548 1568 wavelength [nm] wavelength [nm]
conference & convention enabling the next generation of networks & services Our PMD Measurement Techniques In automatic PMD measurement, inline amplifiers generate 1. cummulated ASE noise we reduced it by inserting programmable optical filters 2. optical surges 2. optical surges we suppressed it by using continuous dummy lights programmable dummy lights filter measurement measurement equipment (RX) equipment (TX)
conference & convention enabling the next generation of networks & services PMD Measurement Setup We measured 12 fibers We injected 4 continuous dummy lights Kyushu Kyushu Okinawa-Island Okinawa-Island down (6 fibers) CTF CTF 4 RX TX up (6 fibers) TX RX 4
conference & convention enabling the next generation of networks & services Dummy Lights’ Positions programmable filter bandwidth measuring signal received power density dummy lights 0 1528 1533 1538 1543 1548 1553 1558 1563 1568 -10 1550_000 1550_000 power density [dBm/0.5 nm] power density [dBm/0.5 nm] -20 0 1525 1530 1535 1540 1545 1550 1555 1560 1565 1570 1575 -30 -10 -20 power density [dBm/res] -40 -30 -50 -40 -60 -50 -60 -70 wavelength [nm] -70 wavelength [nm] PMD測定器入力 1550_000 received optical spectrum measuring longer wavelength (measuring center wavelength)
conference & convention enabling the next generation of networks & services Measured Mean DGD 3.0 specified value (2.6 ps) 2.5 2.0 2.0 mean DGD [ps] 1.5 1.0 0.5 0.0 1 3 5 7 9 11 2 4 6 8 10 12 down up fibers shorter center longer
conference & convention enabling the next generation of networks & services Evaluated DGD Value 3.0 specified value (2.6 ps) 2.5 margin (2 sigma) 2.0 2.0 DGD [ps] 1.5 mean DGD 1.0 0.5 0.0 1 3 5 7 9 11 2 4 6 8 10 12 down up fibers mean DGD margin (2 sigma)
conference & convention enabling the next generation of networks & services Conclusions We developed and deployed a new 900-km submarine DWDM system that offers 30 ch x 43-G transmission - 11 spans of NZ-DSF and two spans of SMF - 11 spans of NZ-DSF and two spans of SMF - mean repeater spacing is 74 km - end to end DGD of submarine facilities is under 2.6 ps - transmission experiments in our laboratory We confirmed our 43 G design by measuring PMD of installed submarine facilities
2010 conference & convention enabling the next generation of networks & services The 7th International Conference & Convention on Undersea Telecommunications Pacifico Convention Plaza Yokohama & InterContinental The Grand Yokohama 11 ~ 14 May 2010 www.suboptic.org
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