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Abstract: Optimized system designs for 160 Gbit/s long-haul transmission will be presented. The influence of fiber type (SSMF, NZDSF), modulation format (RZ, ...
© 2005 OSA/FIO 2005

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System Optimization for 160 Gbit/s Long-Haul Transmission Systems Franko Kueppers†, Ismail E. Araci†, M. Junaid Ansari‡, Malte Schneiders‡, Sascha Vorbeck‡, †



Optical Sciences Center, University of Arizona, 1630 E. University Blvd., Tucson, AZ 85721-0094, USA [email protected] T-Systems International GmbH, Technologiezentrum, Deutsche Telekom Allee 7, D- 64295 Darmstadt, Germany

Abstract: Optimized system designs for 160 Gbit/s long-haul transmission will be presented. The influence of fiber type (SSMF, NZDSF), modulation format (RZ, CSRZ, IM-DPSK), and signal power level was investigated and reach limits of up to 880 km could be shown by means of numerical simulation. ©2005 Optical Society of America OCIS codes: (060.2330) Fiber optics communications; (060.4510) Optical communications; (999-9999) Ultra-high-speed transmission; (999.9999) Modulation formats; (999.9999) Differential phase shift keying

1. Introduction As 10 Gbit/s WDM systems are standard in today’s backbone networks, and 40 Gbit/s WDM equipment is commercially available and has been tested by network operators in numerous field trials, 160 Gbit/s technology now attracts the interest of research institutions and system manufacturers. Following a first field experiment in 2001 over 116 km dispersion compensated standard single-mode fiber (SSMF) [1], the transmission distances could be increased in a laboratory experiment to 480 km SSMF in 2002 [2] and further to 896 km non-zero dispersion shifted fiber (NZDSF) with short-period dispersion management in 2003 (16 km spans, 160 GHz 1.27 ps pulse transmission only) [3]. Very recently 8-channel WDM capability was demonstrated in the field [4]. 2. Set-up and results Here, we present detailed results of a system optimization study taking into account various fiber types (SSMF and low/high dispersion NZDSF), various modulation formats (return-to-zero RZ, non-return-to-zero NRZ, intensity modulated differential phase shift keying IM-DPSK), and a broad range of signal power levels in order to increase system reach. By means of numerical simulations we could investigate transmission performance for a wide set of scenarios (two examples are shown in Fig. 1), optimize the system design using practical system parameters, and achieve up to 880 km system reach with low DCF input signal power sensitivity (Fig. 1, to the right). # of spans @ Q>6dB, NZDSF(a),160 Gb/s,CSRZ-DPSK, Balanced-Rx, Gauß , dc = 0.4 6 6 4 2 11 9 7 8 4 10 7

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Fig. 1. Number of spans (80 km transmission fiber, dispersion compensation, amplification) which can be bridged for a Q-factor of 6 dB. NZDSF combined with CSRZ-DPSK modulation (right) shows superior performance compared to SSMF with conventional RZ modulation (left). 880 km are feasible with a large tolerance with respect to dispersion compensating fiber (DCF) input power.

3. References [1] [2] [3] [4]

Feiste, Ludwig, Schubert, Berger, Schmidt, Weber, Schmauss, Munk, Buchold, Briggmann, Kueppers, Rumpf, “160 Gbit/s Transmission over 116 km Fieled-Installed Fiber Using 160 Gbit/s OTDM and 40 Gbit/s ETDM,“ OFC 2001, ThF3 Auge, Cavallari, Jones, Kean, Watley, Hadjifotiou, “Single Channel 160 Gbit/s OTDM Propagation over 480 km of Standard Fiber Using a 40 GHz Semiconductor Mode-Locked Laser Pulse Source;” OFC 2002, TuA3 Fatome, Pitois, Dinda, Millot, “Experimental demonstration of 160-GHz densely dispersion-managed soliton transmission in a single channel over 896 km of commercial fibers,” Optics Express, Vol. 11, No. 13, June 30, 2003, pp. 1553-1558 Schneiders, Vorbeck, Leppla, Lach, Schmidt, Papernyi, Sanapi, “Field Transmission of 8u170 Gbit/s over High Loss SSMF Link Using Third Order Distributed Raman Amplification,” OFC 2005, PDP39