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Nature-inspired approaches are powerful methods to solve many tough optimization problems. This paper proposes the two optimization approaches named, Big bang-big crunch and Firefly optimization algorithm to solve the optical channel-allocation problem in the optical wavelength division multiplexing systems by using the optimal Golomb ruler sequences. The simulation results conclude that both approaches...
All optical WDM system has the benefit of increased transmission distance and high capacity. The reach of these systems is severely limited by the noise contributed from the combined nonlinear effects inherent in the optical fiber. Of these effects, stimulated Raman scattering (SRS) and four wave mixing (FWM) are the important factors that limit the system capacity and degrade the signal quality....
In order to reduce four-wave mixing (FWM) noises in FSK-modulation/direct-detection FDM lightwave transmission systems, combination of dual deviation frequencies in the FSK modulation and asymmetric repeated unequally spaced frequency allocations is proposed, and FWM noises are theoretically analyzed. It is found that the crosstalk decreases by 8.59 dB and the allowable input optical power increases...
This paper describes the fiber optic loop buffer-based switch in which contention is resolved in the time and wavelength domain. In the loop buffer, tunable wavelength converters (TWCs) are placed in place of semiconductor optical amplifiers (SOAs) as in conventional loop buffer-based architectures. The placement of TWCs inside the buffer facilitate simultaneous read/write operation and dynamic re-allocation...
We characterize a silicon based wavelength converter using a commercial semiconductor amplifier based wavelength converter as a benchmark. Results show that silicon achieves -5.5 dB efficiency, offers broader conversion bandwidth, higher OSNR and negligible channel crosstalk.
Performance analysis of an all-optical multiwavelength metropolitan optical network (MON) is presented. Simulation results of the bit error rate (BER) performance are shown taking into considerations the combined influence of photo detector shot noise, beat noise components arising out of the beating of the signal with accumulated amplifier's spontaneous emission (ASE) and crosstalk introduced at...
In dense wavelength division multiplexed (DWDM) links, the need for greater available bandwidth results in smaller channel separation and larger channel count. This increases the importance of nonlinear coupling effects such as four wave mixing (FWM) and cross-phase modulation (CPM). These impairments, together with chromatic dispersion (CD), polarization mode dispersion (PMD), and amplified spontaneous...
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