Clausen, Anders

Jeppesen, Palle

Oxenløwe, Leif Katsuo

Seoane, Jorge

Siahlo, Andrei

Zhenbo, Xu

We investigate the combined effects of dispersion compensation and Raman amplification in SMF-based transmission span of 160 Gb/s system. The post compensation map shows better power tolerance

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Downloaded from orbit.dtu.dk on: Dec 17, 2017Experimental characterization of dispersion maps with Raman gain in 160 Gb/stransmission systemsXu, Zhenbo; Seoane, Jorge; Siahlo, Andrei; Oxenløwe, Leif Katsuo; Clausen, Anders; Jeppesen, PallePublished in:Technical Digest Conference on Lasers and Electro-Optics 2004Publication date:2004Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Zhenbo, X., Seoane, J., Siahlo, A., Oxenløwe, L. K., Clausen, A., & Jeppesen, P. (2004). Experimentalcharacterization of dispersion maps with Raman gain in 160 Gb/s transmission systems. In Technical DigestConference on Lasers and Electro-Optics 2004 (Vol. 1, pp. CWA20). IEEE.Experimental characterization of dispersion maps with Raman gain in 160 Gb/s transmission systems Zhenbo Xu, J. Seoane, A. I. Siahlo, L. K. Oxenlewe, A. T. Clausen P. Jeppesen Research Center COM, Technical University of Denmark, Kgs. Lyngby, DK-2800. Denmark Emarl: xuz@com dtu dk Abstract: We investigate the combined effects of dispersion compensation and Raman amplification in SMF-based transmission span of 160 Gb/s system. The post compensation map shows better power tolerance. 02004 Optical Society of America OCIS codes: (060.2330) Fiber optlcs communicahous; (060.2320) Fiber optics amplifiers and oscillators Introduction Dispersion maps have been investigated for EDFA-based transmission systems [1,2]; and Raman aided 40 Gb/s WDM systems have achieved record transmission distance [3]. In this paper, the combination of dispersion management and Raman amplification is evaluated in a 160 Gb/s single channel system; the optimum dispersion map is proposed. Schematic of experimental set-up A schematic of the experimental set-up is shown in Fig. 1. A 10 GHz pulse train is generated by a mode-locked fiber ring laser (ML-FRL) at 1558nm, which is encoded with a 27-1 PRBS by a Mach-Zehnder modulator. The modulated signal is launched into a 27-1 PRBS maintaining multiplexer (MUX) to generate a 160 Gb/s OTDM data signal. A second pulse train from the ML-FRL is launched into a NOLM (non-linear optical loop mirror) unit that generates the wavelength converted optical clock signal at 1540 nm. The clock and data signals are combined and launched into the fiber span, which is composed of two 40 km SMFs and one 13 km DCF with complete dispersion compensation at 1558 nm. At the output of the span, a 3 dB coupler is used to split the optical power, and two filters are used to select the clock and data signals separately. The optical data and clock signals were injected into the second NOLM for demultiplexing and the clock was also used to drive the BER test set. TX+MUX SPAN DEMUX+RX SMF SMF DCF Fig. 1. Expenmental set-up, OBPF ophcal bandpass filter Results First we investigate the span and characterize it with and without Raman amplification by optimizing the signal power in the two cases. The optimal input optical power was 4.5 dBm with and 16 dBm without Raman pump. The system performance in Fig. 2 shows that Raman amplification can improve the receiver sensitivity by 2 dB compared with the EDFA case. Authorized licensed use limited to: Danmarks Tekniske Informationscenter. Downloaded on January 22, 2010 at 10:47 from IEEE Xplore.  Restrictions apply. 4 10- . I . ,  . , . , ~, . , . , . , . -37 -36 -35 -34 33 32 31 -30 -29 ‘8 Reciever power ( d h )  Fig. 2. BER curves for back-to-back, transmission with EDFA and transmission with Raman. The combined effect of dispersion map and Raman amplification is analyzed in Fig. 3. We apply the same Raman gain at the end of the span to both maps to compensate the fiber loss of 23 dB. The post compensation dispersion map with DCF at the end of the span offers larger tolerance with respect to the launched signal power and less receiver penalty than the symmetrical dispersion map, where the DCF is placed in the middle of the span. The explanation is that for the same Raman gain, post compensation needs less pump power and consequently reduce Raman noise. Our simulation confirms that the non-linear phase shft is smaller when post dispersion compensating. i . , . , . , . , . ,  0 2 4 6 8 1 0  Span launch power (dBm) Fig. 3. Receiver penalty of symmetncal and post dispersion compensation with same Raman on-off gain Conclusion A transmission span for use in a 160 Gb/s system was investigated with respect to dispersion map and Raman amplification. Raman amplification reduced the transmission penalty by 2 dB compared to the EDFA case. The post compensation dispersion map is more tolerant to launch power. . Reference 1.  A Cauvin, et al, “Single -channel nonlinear mpairments at vmous bit-rate in dispersion managed systems”, Mo4.2.4, ECOC 2003 2. J Berger. et al. “160  Gbit/s transmission over dispersion managed fiber set”, Mo3.6.6, ECOC 2003 3. B. Zhu, et al., “Transmssion of 1.6 Tb/s(40*42.7 Gb/s) over transoceanic distance with terrestrial 100-km amplifier spans”, FN2. OFC 2003 Authorized licensed use limited to: Danmarks Tekniske Informationscenter. Downloaded on January 22, 2010 at 10:47 from IEEE Xplore.  Restrictions apply. 

Experimental characterization of dispersion maps with Raman gain in 160 Gb/s transmission systems

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Experimental characterization of dispersion maps with Raman gain in 160 Gb/s transmission systems

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