Patent ID: 6937628

Claim:
An optical transmitter module, comprising: a laser source to output outgoing light; an etalon positioned to pass part of the outgoing light from the laser source therethrough; a first photo detector positioned to receive the part of the outgoing light passed through the etalon, to produce a first detection signal; a second photo detector positioned to receive another part of the outgoing light not passed through the etalon, to produce a second detection signal; a laser source driver circuit to receive and compare the first detection signal and second detection signal, and to drive and control the laser source to substantially a specific oscillating frequency using feedback based at least in part on a differential between the first detection signal and second detection signal; wherein the etalon includes two plates that sandwich at least one media plate therebetween, and each plate has an optical characteristic allowing transmission of the part of the outgoing light therethrough; wherein the etalon has a construction where: one end of each plate is fixed to the at least one media plate, and the other end extends from the at least one media plate to form a cantilever structure, or a center portion of each plate is fixed to the at least one media plate, and other portions of the plate extend from the at least one media plate to form a cantilever structure, or the at least one media plate includes first and second media plates, in which one end of each plate is fixed to the first media plate, and the other end of each plate is fixed to the second media plate, whereby the plates and the first and second media plates form an inboard beam structure; wherein a space between the two plates not having the at least one media plate therebetween, serves as a multiple interference region of the etalon; and wherein each media plate of the at least one media plate is a solid material whose coefficient of thermal expansion is 10-7/° C. or less.