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US 6,477,190 B1Granted
Optical module
AssigneeFujitsu Limited
InventorsManabu Komiyama, Tatsuro Kunikane, Yoshimitsu Sakai, Masaki Kuribayashi
Life of this patent
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Abstract
An optical module includes a first level detecting part having a semi-transparent structure and receiving a light signal emitted from a light-emitting element, a second level detecting part receiving the light signal which penetrates through the first level detecting part and passes through an optical filter, and a control part controlling an operation temperature of the light-emitting element on the basis of electric signals output from the first and second level detecting parts.
Claims26
An optical module comprising:
- a light-emitting element capable of varying an oscillation wavelength of the light output thereof by adjusting an operation temperature;
- a splitter splitting a light signal emitted from the light-emitting element;
- a first level detecting part receiving a first split light signal from the splitter;
- a second level detecting part receiving a second split light signal from the splitter via an optical filter;
- a first control part controlling the operation temperature of the light-emitting element in accordance with first and second electric signals output from the first and second level detecting parts, respectively;
- and
- a second control part controlling an operation temperature of the optical filter thereby to adjust a current oscillation wavelength of the light-emitting element to a desired oscillation wavelength, by detecting a current operating temperature of the optical filter, accessing a storage of plural reference values respectively corresponding to plural different operation temperatures of the optical filter set for respective, different oscillation wavelengths of the light-emitting element, selecting the respective reference operation temperature value corresponding to the desired oscillation wavelength and comparing the current operation temperature value with the selected reference operation temperature value so as to adjust the current operation temperature to the desired operation temperature.
4 more elements
An optical module comprising:
- a light-emitting element capable of varying an oscillation wavelength based on an operation temperature;
- a splitter splitting a light signal emitted from the light-emitting element;
- a first level detecting part receiving a first split light signal from the splitter;
- a second level detecting part receiving a second split light signal from the splitter via an optical filter;
- a first control part controlling the operation temperature of the light-emitting element in accordance with electric signals output from the first and second level detecting parts;
- and
- a second control part controlling an operation temperature of the optical filter in accordance with the oscillation wavelength of the light-emitting element, wherein the second control part comprises:
- a temperature detecting part detecting the operation temperature of the optical filter;
- a reference value outputting part from which reference values corresponding to operation temperatures set to respective oscillation wavelengths of the light-emitting element are output;
- a comparator comparing a value corresponding to the operation temperature output from the temperature detecting part with one of the reference values from the reference value outputting part;
- and
- a second temperature control part controlling the operation temperature of the optical filter based on comparison results.
9 more elements
An optical module comprising:
- a light-emitting element;
- a first temperature control part controlling a temperature of the light-emitting element;
- a first light receiving part receiving a light from the light-emitting element;
- a second light receiving part receiving the light from the light-emitting element via an optical filter;
- and
- a second temperature control part controlling a temperature of the optical filter, wherein:
- the first light-receiving part includes a light receiving element having a semi-transparent structure;
- and
- the optical filter filters the light from the first light receiving part, so that a filtered light is applied to the second light receiving part.
6 more elements
An optical module comprising:
- a light-emitting element capable of varying an oscillation wavelength of a light signal emitted from the light-emitting element;
- a splitter splitting the light signal emitted from the light-emitting element;
- a first level detecting part receiving a first split light signal from the splitter;
- an optical filter;
- a second level detecting part receiving a second split light signal from the splitter via the optical filter;
- a first control part controlling the oscillation wavelength of the light-emitting element in accordance with respective first and second electric signals output from the first and second level detecting parts, respectively;
- and
- a second control part controlling an operation temperature of the optical filter thereby to adjust a current oscillation wavelength of the light-emitting element to a desired oscillation wavelength, by detecting a current operating temperature of the optical filter, accessing a storage of plural reference values respectively corresponding to plural different operation temperatures of the optical filter set for respective, different oscillation wavelengths of the light-emitting element, selecting the respective reference operation temperature value corresponding to the desired oscillation wavelength and comparing the current operation temperature value with the selected reference operation temperature value so as to adjust the current operation temperature to the desired operation temperature.
5 more elements
An optical module comprising:
- a light-emitting element capable of varying an oscillation wavelength of light signal emitted from the light-emitting element;
- a splitter splitting the light signal emitted from the light-emitting element;
- a first level detecting part receiving a first split light signal from the splitter;
- an optical filter;
- a second level detecting part receiving a second split light signal from the splitter via the optical filter;
- a first control part controlling the oscillation wavelength of the light-emitting element in accordance with electric signals output from the first and second level detecting parts;
- and
- a second control part controlling an operation temperature of the optical filter in accordance with the oscillation wavelength of the light-emitting element, wherein the second control part comprises:
- a temperature detecting part detecting the operation temperature of the optical filter;
- a reference value outputting part from which reference values corresponding to operation temperatures set for respective oscillation wavelengths of the light-emitting element are output;
- a comparator comparing a value corresponding to the operation temperature output from the temperature detecting part with one of the reference values from the reference value outputting part and outputting a comparison result;
- and
- a second temperature control part controlling the operation temperature of the optical filter based on the comparison results.
10 more elements
An optical module comprising:
- a light-emitting element;
- a first temperature control part controlling a temperature of the light-emitting element;
- a first light receiving part receiving a light from the light emitting element;
- a second light receiving part receiving the light from the light-emitting element via an optical filter;
- and
- a second temperature control part controlling a temperature of the optical filter, wherein:
- the first light-receiving part includes a light receiving element having a semi-transparent structure;
- and
- the optical filter filters the light from the first light receiving part, so that a filtered light is applied to the second light receiving part.
6 more elements
Dependencies are inferred from the claim text.