Optical module

An optical module comprising:

• a) a light emitting semiconductor device having a first facet and a second facet opposing said first facet, said semiconductor device oscillating at a wavelength λ;
• b) a lens optically coupled to said second facet of said semiconductor device;
• c) a first optical detector for monitoring an optical output of said semiconductor device and outputting a first output;
• d) a second optical detector for monitoring said optical output of said semiconductor device and outputting an second output;
• e) a wedge Etalon device having a first surface for optically coupling said lens and a second surface for optically coupling said first detector and said second detector, said first surface being inclined to said second surface so as to make an transmittance having a predetermined period along a first direction, said Etalon device having a first portion including a first optical axis connecting said semiconductor device to said first detector and a second portion including a second optical axis connecting said semiconductor device to said second detector;
• and
• f) a thermoelectric cooler for controlling a temperature of said semiconductor device;
• wherein a width of said second detector is narrower than a half of said period along said first direction, a wavelength dependence of said first portion being less than a wavelength dependence of said second portion at said wavelength λ, and
• wherein said oscillation wavelength λ of said semiconductor device is controlled through said temperature of said thermoelectric cooler by said second output of said second detector.

An optical module comprising:

• a) a light emitting semiconductor device having a first facet and a second facet opposing to said first facet, said semiconductor device outputting an optical output at a wavelength λ;
• b) a lens optically coupled to said second facet of said semiconductor device;
• c) a first optical detector for monitoring an optical output of said semiconductor device and outputting a first output, said first detector having a first width along a predetermined direction;
• d) a second optical detector for monitoring said optical output of said semiconductor device and outputting an second output, said second detector having a second width along said direction;
• e) a wedge Etalon device having a first surface for optically coupling said lens and a second surface for optically coupling said first detector and said second detector, said first surface being inclined to said second surface so as to make an transmittance having a predetermined period along said direction, said Etalon device having a first portion including a first optical axis connecting said semiconductor device to said first detector and a second portion including a second optical axis connecting said semiconductor device to said second detector, said first portion having a first wavelength dependence of said transmittance at said wavelength λ and said second portion having a second wavelength dependence of said transmittance at said wavelength λ;
• and
• f) a thermoelectric cooler for controlling a temperature of said semiconductor device;
• wherein said first width of said first detector is wider than said period along said direction, and said output of said semiconductor device is controlled by said first output of said second detector.