Laser plasma

Performance investigation of optical wavelength conversion using a newly designed highly nonlinear ultra-flattened dispersion fibre

S. Selvendran^a, A. Sivanantharaja<sup>b

a</sup> CVR college of Engineering, India
^b Alagappa Chettiar College of Engineering and Technology, India

Abstract: We report an analysis of the wavelength conversion using a newly designed highly nonlinear ultra-flattened dispersion fibre (HN-UFF) for different signal modulation formats. A new technical solution is presented for high bit rate wideband wavelength conversion without any additional pump signals. Two-channel 80 Gb s^-1 modulated signals with differential quadrature phase shift keying (DQPSK) are considered for wavelength conversion using four wave mixing (FWM) technique in a newly designed HN-UFF without additional pump signals. It is found that even when the input signal frequency spacing is increased beyond 2 THz, DQPSK modulation with carrier-suppressed return-to zero (CSRZ), or CSRZDQPSK, gives a better value of flattened conversion efficiency and Q factor. The impact of input power on conversion efficiency and effective flatness is also investigated. The performance parameters, such as conversion efficiency, Q factor, log of bit error rate (BER), received signal power and power penalty, are analysed.

Keywords: dispersion, nonlinearity, four wave mixing, wavelength conversion, modulation format.

Received: 13.08.2017
Revised: 29.08.2018

 English version: Quantum Electronics, 2019, 49:6, 585–592

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