Patent ID: 6931038

Claim:
A wavelength locked semiconductor laser module for fiber optic communications, the module comprising: a semiconductor laser substrate; an array of semiconductor lasers formed upon the semiconductor laser substrate; a TEC in thermal contact with the semiconductor laser substrate; a thermally conducting support/substrate in thermal contact with the TEC; a multiple-cavity phase shifted etalon in thermal contact with the thermally conducting support/substrate and configured to facilitate monitoring of a wavelength of light from at least one semiconductor laser of said array; a collimating lens receiving light from at least one semiconductor laser of said array; a first optical isolator receiving light from the collimating lens; a first mirror configured to reflect light from the first optical isolator upwardly; a second mirror configured to reflect light from the first mirror backwardly; a second optical isolator receiving light from the second mirror; a polarizing beam splitter receiving light from the second optical isolator; a quarter wave plate receiving light from the polarizing beam splitter and providing light to the etalon; a temperature sensor configured to measure a temperature representative of a temperature of the etalon; and a thermal jacket around the etalon to reduce the thermal gradient and increase thermal equilibrium time.