Optical module implementing with optical source, optical modulator, and wavelength detector, and a method to assemble the same

A process of assembling an optical module that installs a laser unit, a modulator unit, and a detector unit enclosed within a housing, the laser unit including a semiconductor laser diode (LD) having a front facet that outputs a first continuous wave (CW) beam and a rear facet that outputs a second CW beam, the modulator unit that modulates the first continuous wave (CW) beam and includes an input unit and an output unit, the detector unit that determines a wavelength of the second CW beam, the housing including a first output port and a second output port, the method comprising steps of:

• installing a first thermo-electric cooler (TEC), a second TEC, and a third TEC within the housing;
• mounting the laser unit on the first TEC, the modulator unit on the second TEC, and the detector unit on the third TEC, respectively;
• optically coupling one of the first CW beam with the first output port of the housing through the modulator unit and the second CW beam with the second output port of the housing through the detector unit:
• and
• optically coupling another of the first CW beam with the first output port of the housing through the modulator unit and the second CW beam with the second output port of the housing through the detector unit,
• wherein the step of coupling the first CW beam with the first output port includes steps of:
• optically coupling the laser unit with the modulator unit through the input unit;
• and
• optically coupling the modulator unit with the first output port through the output unit, and
• wherein the step of coupling the second CW beam with the second output port includes steps of:
• optically coupling the detector unit with the laser unit;
• and
• optically coupling the detector unit with the second output port.