Abstract: A simple and cost effective optical device is provided which locks the wavelength output of a laser transmitter in an optical transmission system as well as substantially reducing and/or eliminating signal crosstalk. A light source is coupled along an optical path to a filtering element. The light source has output frequency shifts based on variation in input current. The filtering element is configured with a reflectivity characteristic which corresponds to a first portion of the optical signal associated with one or more frequencies such that the reflectivity characteristic is greater than the output frequency variations associated with the light source.

Abstract: An optical device is provided which locks the wavelength output of a laser transmitter in an optical transmission system as well as preventing the propagation of unwanted signals generated by the laser transmitter prior to the transmitter reaching the desired operating wavelength thereby reducing crosstalk between channels within a wavelength division multiplexed communication system.