Pump Laser Diodes and WDM Pumping

Namiki, Shu; Tsukiji, Naoki; Emori, Yoshihiro

doi:10.1007/978-0-387-21583-9_5

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…Total input Raman pump power, P p 0 = 26.7 dBm which is fixed for all three pumping schemes. The pumps have a RIN of −155 dB/Hz [42]. The DCF is divided into N R = 2000 segments, which corresponds to a step size of 1.5 m. The Raman gain over a segment is determined by Eqs.…”

Section: Simulation Resultsmentioning

confidence: 99%

A Raman-Pumped Dispersion and Nonlinearity Compensating Fiber For Fiber Optic Communications

Bidaki

Kumar

2020

IEEE Photonics J.

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An optical back propagation (OBP) technique using Raman pumped dispersion compensation fibers (DCF) is investigated to compensate for nonlinear impairments in WDM systems in real time. The proposed inline OBP module consists of an optical phase conjugator, amplifiers and a Raman pumped DCF. In order to suppress the nonlinear effects of the transmission fibers exactly, the power in the backpropagation fiber should increase exponentially with distance. This can be approximately achieved by using forward/backward Raman pumping of the dispersion compensating fiber (DCF). We introduce two configurations to realize the OBP. In this paper, we show that the OBP with forward/backward pumping provides 2.45 dB Q-factor gain compared to single-channel digital back propagation (DBP) when transmission distance is 1500 km for a WDM system with QAM-64. To minimize the variation of effective gain coefficient of the Raman pumped DCF as a function of distance, bidirectional pumping scheme which can provide the signal power profile closest to that required by the ideal OBP condition is proposed. The bidirectional pumping scheme provides a superior performance over forward/backward pumping and wideband DBP (i.e., DBP is applied on the entire WDM signal). Our numerical simulation results show that the bidirectional pumping scheme provides 7.6 dB and 5 dB advantage in Q-factor as compared to single-channel DBP and wideband DBP, respectively at a transmission distance of 5000 km. The maximum achievable reach of a long haul WDM system can be enhanced by 225% using bidirectional pumping scheme as compared to wideband DBP.

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Section: Simulation Resultsmentioning

confidence: 99%

A Raman-Pumped Dispersion and Nonlinearity Compensating Fiber For Fiber Optic Communications

Bidaki

Kumar

2020

IEEE Photonics J.

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“…Nevertheless, by carefully optimising the launched powers, the desired spectral equalisation can be achieved. Multi-wavelength pumped DCF modules have been used to provide gain bandwidths that exceed 100 nm with uniformities of better than 0.3 nm but they are complicated sub-systems (Giltrelli and Santagiustina, 2004;Namiki et al, 2004;Neto et al, 2009). Wavelengthstabilised pump lasers are expensive and the resulting gain spectra are sensitive to the precise values of the launched powers.…”

Section: Introductionmentioning

confidence: 99%