Semiconductor laser device for optical communication

A wavelength monitoring device comprising:

• a semiconductor laser configured to radiate a forward laser beam and a backward laser beam;
• a photo detector configured to receive the backward laser beam radiated from the semiconductor laser;
• a window which transmits a most portion of the forward laser beam radiated from the semiconductor laser and on which the remaining portion of the forward laser beam is reflected as a reflected laser beam;
• a carrier on which the semiconductor laser is mounted;
• and
• a light shielding member which is fixed to the carrier and is configured to shield the photo detector from the reflected laser beam.

A wavelength monitoring device comprising:

• a semiconductor laser configured to radiate a forward laser beam and a backward laser beam;
• a carrier having a slot which is formed on a top surface, the semiconductor laser being arranged in the slot;
• a photo detector configured to receive the backward laser beam which is radiated from the semiconductor laser;
• a window which transmits a most portion of the forward laser beam radiated from the semiconductor laser and on which the remaining portion of the forward laser beam is reflected as a reflected laser beam;
• and
• a light shielding member, which is placed on the upper surface of the carrier so as to straddle the slot of the carrier and is configured to shield the photo detector from the reflected laser beam.

A wavelength monitoring device comprising:

• a semiconductor laser configured to radiate a forward laser beam and a backward laser beam;
• a photo detector configured to receive the backward laser beam radiated from the semiconductor laser;
• a lens configured to converge the forward laser beam radiated from the semiconductor laser;
• a window which transmits a most portion of the forward laser beam converged by the lens and on which the remaining portion of the forward laser beam is reflected as a reflected laser beam;
• a lens fixing member to which the lens is fixed;
• and
• a light shielding member which is supported by the lens fixing member and is formed in a U shape so as to cover an upper peripheral area of the semiconductor device.

A wavelength monitoring device comprising:

• a semiconductor laser configured to radiate a forward laser beam and a backward laser beam;
• a photo detector configured to receive the backward laser beam radiated from the semiconductor laser;
• a window which transmits a most portion of the forward laser beam radiated from the semiconductor laser and on which the remaining portion of the forward laser beam is reflected as a reflected laser beam;
• a carrier on which the semiconductor laser is mounted;
• and
• a light shielding member which is fixed to the carrier and is formed in a U shape so as to cover an upper peripheral area of the semiconductor device.

A wavelength monitoring device comprising:

• a semiconductor laser configured to radiate a forward laser beam and a backward laser beam;
• a photo detector configured to receive the backward laser beam radiated from the semiconductor laser;
• a window which transmits a most portion of the forward laser beam radiated from the semiconductor laser and on which the remaining portion of the forward laser beam is reflected as a reflected laser beam;
• a carrier on which the semiconductor laser is mounted;
• and
• a light shielding member which is fixed to the carrier and is formed in an L shape so as to cover an upper peripheral area of the semiconductor device.

A wavelength monitoring device comprising:

• a semiconductor laser configured to radiate a forward laser beam and a backward laser beam;
• a carrier having a slot which is formed on a top surface, the semiconductor laser being arranged in the slot;
• a photo detector configured to receive the backward laser beam which is radiated from the semiconductor laser;
• a window which transmits a most portion of the forward laser beam radiated from the semiconductor laser and on which the remaining portion of the forward laser beam is reflected as a reflected laser beam;
• and
• a light shielding member which is placed on the upper surface of the carrier so as to straddle the slot of the carrier and so as to cover an upper peripheral area of the semiconductor device.