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

An optical module, comprising:

• a wavelength tunable laser diode (t-LD) having a first facet and a second facet, the t-LD outputting a first continuous wave (CW) beam from the first facet and a second CW beam from the second facet;
• an optical modulator primarily made of semiconductor materials, the optical modulator generating a first output beam by modulating the first CW beam;
• a wavelength detector that splits the second CW beam into a monitored beam and a second output beam, the wavelength detector determining an oscillation wavelength of the t-LD;
• a housing including a front wall, a rear wall, and two side walls connecting the front wall to the rear wall, the housing enclosing the t-LD, the optical modulator, and the wavelength detector in a space partitioned by the front wall, the rear wall, and the side walls;
• and
• a first output port and a second output port each provided in the front wall of the housing, where the first output port outputs the first output beam, and the second output port outputs the second output beam,
• wherein the wavelength detector and the t-LD are arranged on an optical axis of the second output port that extends along one of the side walls, and
• wherein the optical modulator is arranged on an optical axis of the first output port that extends along another of the side walls, the optical modulator having an input port, an output port, and a signal pad, the input port being provided in a side of the optical modulator facing the one of the side walls of the housing, the output port being provided in a side of the optical modulator facing the front wall of the housing, and the signal pad being provided in a side of the optical modulator facing the rear wall of the housing, the signal pad providing a signal containing high frequency components.