Optical module, transmitter and WDM transmitting device

A optical transmitter comprising:

• an optical module having
• a light-emitting device configured to output a laser beam,
• a first temperature-sensing unit disposed adjacent to the light-emitting device so as to sense a temperature of said light-emitting device,
• an optical filter positioned to receive and filter at least a component of the laser beam,
• a wavelength monitor device configured to monitor a wavelength of the laser beam and output a signal associated with monitored light at the wavelength,
• a wavelength regulating unit configured to regulate the wavelength of the laser beam that is output from said light-emitting device based on said signal from the wavelength monitor device, wherein at least a portion of said wavelength monitor device being in contact with said wavelength regulating unit, and
• a second temperature-sensing unit disposed adjacent to said optical filter so as to sense a temperature of said optical filter;
• a control unit configured to control said wavelength regulating unit so as to fix the wavelength of the laser beam outputted from said light-emitting device at a predetermined locked wavelength, based on the signal outputted from said wavelength monitor device;
• and
• a correcting unit configured to input the signal of the temperature sensed by said second temperature-sensing unit and to output a correction signal to said control unit, said correction signal being operative to correct the control signal outputted from said control unit for a correction of any deviation in said locked wavelength associated with the temperature characteristic in said optical filter.

A WDM transmitting device comprising:

• a plurality of optical transmitting devices configured to output to a common optical fiber respective optical signals at different wavelengths, each of said plurality of said transmitting devices including
• an optical module having
• a light-emitting device configured to output a laser beam,
• a first temperature-sensing unit disposed adjacent to the light-emitting device so as to sense a temperature of said light-emitting device,
• an optical filter positioned to receive and filter at least a component of the laser beam,
• a wavelength monitor device configured to monitor a wavelength of the laser beam and output a signal associated with monitored light at the wavelength,
• a wavelength regulating unit configured to regulate the wavelength of the laser beam that is output from said light-emitting device based on said signal from the wavelength monitor device, wherein at least a portion of said wavelength monitor device being in contact with said wavelength regulating unit, and
• a second temperature-sensing unit disposed adjacent to said optical filter so as to sense a temperature of said optical filter,
• a control unit configured to control said wavelength regulating unit so as to fix the wavelength of the laser beam outputted from said light-emitting device at a predetermined locked wavelength, based on the signal outputted from said wavelength monitor device;
• and
• a correcting unit configured to input the signal of the temperature sensed by said second temperature-sensing unit and to output a correction signal to said control unit, said correction signal being operative to correct the control signal outputted from said control unit for a correction of any deviation in said locked wavelength associated with the temperature characteristic in said optical filter.

An optical module comprising:

• a light-emitting device configured to output a laser beam, said light-emitting device being positioned at a first location;
• means for sensing a temperature of said light-emitting device;
• means for filtering at least a component of the laser beam;
• means for monitoring a wavelength of the laser beam at a second location and for outputting a signal indicative of the wavelength, said second location being different than said first location;
• means for regulating the wavelength of the laser beam that is output from said light-emitting device based on said signal from said means for monitoring a wavelength of the laser beam;
• wherein at least a portion of said means for monitoring being in contact with said means for regulating, and
• means for sensing a second temperature of said means for filtering, the signal of the temperature sensed by said means for sensing a second temperature being used to correct the signal outputted from said means for monitoring a wavelength of the laser beam.

An optical transmitter comprising:

• an optical module having
• a light-emitting device configured to output a laser beam, said light-emitting device being positioned at a first location,
• means for sensing a temperature of said light-emitting device,
• means for filtering at least a component of the laser beam;
• means for monitoring a wavelength of the laser beam at a second location and for outputting a signal indicative of the wavelength, said second location being different than said first location,
• means for regulating the wavelength of the laser beam that is output from said light-emitting device based on said signal from said means for monitoring a wavelength of the laser beam, wherein at least a portion of said means for monitoring being in contact with said means for regulating,
• means for sensing a second temperature of said means for filtering;
• means for controlling said means for regulating so as to fix the wavelength of the laser beam outputted from said light-emitting device at a predetermined locked wavelength, based on the signal outputted from said means for monitoring;
• and
• means for correcting to input the signal of the temperature sensed by said means for sensing a second temperature and to output a correction signal to said means for controlling, said correction signal being operative to correct the control signal outputted from said means for controlling for a correction of any deviation in said locked wavelength associated with the temperature characteristic in said means for filtering.

A WDM transmitting device comprising:

• a plurality of optical transmitting devices configured to output to a common optical fiber respective optical signals at different wavelengths, each of said plurality of optical transmitting devices including
• an optical module having
• a light-emitting device configured to output a laser beam, said light-emitting device being positioned at a first location,
• means for sensing a temperature of said light-emitting device;
• means for filtering at least a component of the laser beam;
• means for monitoring a wavelength of the laser beam at a second location and for outputting a signal indicative of the wavelength, said second location being different than said first location,
• means for regulating the wavelength of the laser beam that is output from said light-emitting device based on said signal from said means for monitoring a wavelength of the laser beam, wherein at least a portion of said means for monitoring being in contact with said means for regulating, means for sensing a second temperature of said means for filtering;
• means for controlling said means for regulating so as to fix the wavelength of the laser beam outputted from said light-emitting device at a predetermined locked wavelength, based on the signal outputted from said means for monitoring;
• and
• means for correcting to input the signal of the temperature sensed by said means for sensing a second temperature and to output a correction signal to said means for controlling, said correction signal being operative to correct the control signal outputted from said means for controlling for a correction of any deviation in said locked wavelength associated with the temperature characteristic in said means for filtering.

A method for stabilizing a wavelength of a laser beam output from a light-emitting device, comprising steps of:

• outputting a laser beam from the light-emitting device, said light-emitting device being positioned at a first location;
• receiving and filtering at least a component of the laser beam by an optical filter;
• monitoring a wavelength of the laser beam at a second location and outputting a signal indicative of the wavelength by a wavelength monitor device, said second location being different than said first location;
• regulating the wavelength of the laser beam that is output from said light-emitting device based on said signal from said wavelength monitor device by a wavelength regulating unit;
• wherein at least a portion of said wavelength monitor device being in contact with said wavelength regulating unit;
• and
• sensing a second temperature of said optical filter, wherein
• the signal outputted from said wavelength monitor device being inputted into a control unit configured to control said wavelength regulating unit so as to fix the wavelength of the laser beam outputted from said light-emitting device at a predetermined locked wavelength,
• the signal of the second temperature sensed being inputted into a correcting unit configured to output a correction signal to said control unit so as to correct the control signal outputted from said control unit for a correction of any deviation in said locked wavelength associated with the temperature characteristic in said optical filter.