Abstract

In order to increase the information capacity in wavelength division multiplexing (WDM) lightwave transmission, the realization of multi-wavelength laser sources with stable, narrow linewidth and equal output power in the 1.55-µm band have been extensively developed recently [1-2]. With the characteristics of compact, low cost and low temperature coefficient, WDM fiber laser sources are promising candidates for lightwave communications [3]. In this paper, we propose and simulate a novel configuration of power-equalized WDM fiber laser sources. The simulation is based on the spectral model of optical amplifier [4]. An 11-channel WDM laser sources with wavelengths λ_s ranging from 1530- to 1560 nm of 3.0 run channel spacing is studied. The parameters used here are similar to that in ref. [5]. Erbium-doped fiber (EDF) is modeled as a homogeneously broadened two-level system. The laser is assumed to have two counter-propagating signal beams at the laser wavelength with no input signal to start the oscillation process. The input conditions are given as: where Pp° is the launched pump power at z = 0. Above the threshold conditions, the generation and amplification of the forward and backward ASE noises within the gain fiber are sufficient to give rise to the lasing condition. To describe the reflector effects, the following boundary conditions are given [6]: where the subscript n is the n th iteration number of the iterative loop. Ro(λ_i) and R_i(λ_i) are the reflectivities at λ_i for z = 0 and z = L, respectively. A₁ and A₂ are the losses induce from the FBG-pair reflectors.

© 2001 IEEE