Compact semiconductor laser diode module

A semiconductor laser diode module comprising:

• a semiconductor laser diode having a front facet for emitting a light beam;
• a collimating lens for receiving said light beam to generate a collimated light beam;
• a coupling lens for receiving said collimated light beam and converging said collimated light beam to an optical fiber;
• a bandpass filter for receiving a first part of said collimated light beam;
• a light detector having a first portion for receiving the first part of said collimated light beam through said bandpass filter and a second portion for receiving a second part of said collimated light beam;
• an isolator interposed between said collimating lens and said bandpass filter;
• and
• a temperature-controlled substrate mounting said semiconductor laser diode, said collimating lens, said isolator, said bandpass filter and said light detector,
• so that a wavelength of said semiconductor laser diode is controlled by changing a temperature of said temperature-controlled substrate in accordance with an output signal of the first portion of said light detector, and a light intensity of said semiconductor laser diode is controlled in accordance with an output signal of the second portion of said light detector.

A semiconductor laser diode module comprising:

• a semiconductor laser diode having a front facet for emitting a light beam;
• a collimating lens for receiving said light beam to generate a collimated light beam;
• a coupling lens for receiving said collimated light beam and converging said collimated light beam to an optical fiber;
• a bandpass filter for receiving a first part of said collimated light beam;
• a light detector having a first portion for receiving the first part of said collimated light beam through said bandpass filter and a second portion for receiving a second part of said collimated light beam;
• an isolator interposed between said collimating lens and said bandpass filter;
• a first temperature-controlled substrate mounting said semiconductor laser diode, said collimating lens and said isolator;
• and
• a second temperature-controlled substrate mounting said bandpass filter and said light detector,
• so that a wavelength of said semiconductor laser diode is controlled by changing a temperature of said first temperature-controlled substrate in accordance with an output signal of the first portion of said light detector, and a light intensity of said semiconductor laser diode is controlled in accordance with an output signal of the second portion of said light detector, a temperature of said second temperature-controlled substrate being controlled at a predetermined value.

A semiconductor laser diode module comprising;

• a semiconductor laser diode having a front facet for emitting a light beam;
• a collimating lens for receiving said light beam to generate a collimated light beam;
• a coupling lens for receiving said collimated light beam and converging said collimated light beam to an optical fiber;
• a bandpass filter for receiving a first part of said collimated light beam;
• a light detector having a first portion for receiving the first part of said collimated light beam through said bandpass filter and a second portion for receiving a second part of said collimated light beam;
• an isolator interposed between said collimating lens and said bandpass filter;
• a temperature-controlled substrate mounting said semiconductor laser diode, said collimating lens and said isolator;
• and
• a non-temperature-controlled substrate mounting said bandpass filter and said light detector,
• so that a wavelength of said semiconductor laser diode is controlled by changing a temperature of said temperature-control led substrate in accordance with an output signal of the first portion of said light detector, and a light intensity of said semiconductor laser diode is controlled in accordance with an output signal of the second portion of said light detector.