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Optical micro-ring resonator arrays (OMRA) are versatile elements for designing various photonic integrated circuits and systems for optical signal processing and communication. In this paper, we analyze the performance of an OMRA used for optical demodulation of both single channel DPSK and 3-channel WDM-DPSK signals. Several apodization profiles have been investigated to decide for the optimal performance...
In this paper a gain clamping approach is used to flatten the gain of erbium doped fiber amplifier (EDFA), so that it could be used for long haul wave length division multiplexing (WDM) communication system to maximize the transmission distance. The gain clamping is done through filters like Multi-stage Lorentzian filter, Super Gaussian filter, Bessel filter, and Raised cosine filter with bandwidth...
We have proposed a novel scheme based on chirped fiber Bragg grating (CFBG) as a narrowband optical filter demodulator and a maximum likelihood sequence estimation (MLSE) receiver to attain an enhanced unrepeatered reach in a nonreturn-to-zero differential phase-shift-keying (NRZ-DPSK) transmission link. An extended reach up to 500 km with only 2-dB optical signal-to-noise ratio penalty is found feasible...
We experimentally characterized at 10 and 40 Gb/s the optical packet power equalization capability of the non-linear polarization-rotation effect in an SOA. We found at 40 Gb/s a maximum input dynamic range tolerance of 12 dB.
We report a detailed experimental characterization of the wavelength conversion of 10 Gb/s non-return-to-zero differential phase shift keying (NRZ-DPSK) optical signals based on four wave mixing (FWM) in a semiconductor optical amplifier (SOA). The performance of this coherent wavelength converter is compared with theoretical results and found to perform better, in terms of extended range of signal-to-pump...
The tolerance against self-phase modulation (SPM) of three differential phase-shift keying (DPSK) modulation schemes viz. conventional DPSK (CDPSK), symmetrical DPSK (SDPSK) and pi/4-DPSK in a 40-Gb/s multi-span dispersion compensated single-mode fiber (SMF) link is studied through detailed numerical simulation. The study takes into account the influence of pulse duty-ratio, tight optical filtering,...
An efficient genetic algorithm (GA) assisted bit error rate (BER) estimation method using a sum of Gaussian approximation (SGA) for a single channel optical direct detection DPSK system affected by nonlinear phase noise is presented.
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