Abstract
We investigate reduction of mode partition noise of a spectrally sliced Fabry-Perot laser diode (FP-LD) for application to seeded DWDM systems. The proposed scheme for the noise reduction incorporates a fiber-based Mach-Zehnder interferometer (MZI) and a reflective semiconductor optical amplifier (RSOA). The MZI enables to reduce a relative intensity noise (RIN) more than 3 dB with better noise distributions. Experimental results of 10-Gb/s signal transmission exhibit a considerable bit-error-rate (BER) reduction by three orders of magnitude at the given received power. After the noise reduction, the FP-LD is applied to a 10-Gb/s DWDM system as a seed-light-source. In a local-seeding scheme, return-to-zero (RZ) and carrier-suppressed (CS)-RZ signal formats are compared as a function of transmission distance. Furthermore, a back-reflection induced impairment is evaluated in a remote-seeding scheme. We also count the number of useable channels to show the feasibility of DWDM transmission.
Highlights
In recent years, the drastic growth in bandwidth-intensive applications has been driving multigigabit sustained bit-rate services for optical access/metro networks
A seeded dense wavelength division multiplexing (DWDM) system based on an amplified-spontaneous-emission (ASE) light can be realized in a cost-effective manner [2,3,4,5,6]
We found that the Mach-Zehnder interferometer (MZI) enables to reduce the mode partition noise itself, and lead an enhancement of the noise suppression by the gain-saturated reflective semiconductor optical amplifier (RSOA)
Summary
The drastic growth in bandwidth-intensive applications has been driving multigigabit sustained bit-rate services for optical access/metro networks. Quantum dot/dash mode locked lasers (QD-MLLs) can enable a high-speed transmission over 10-Gb/s due to low amplitude and phase noise [8,9]. These lasers are based on rather costly and complex manufacturing process. We found that the MZI enables to reduce the mode partition noise itself, and lead an enhancement of the noise suppression by the gain-saturated RSOA. The noise-reduced FP-LD is applied to an injection seeded DWDM system as a seedlight-source for demonstrating the 10-Gb/s signal transmission without dispersion compensation. In the remoteseeding scheme, a back-reflection induced impairment and usable DWDM channel is discussed
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