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US 2012/0269508 A1Published application
Optical transmitter and optical transmission apparatus
AssigneeFujitsu Optical Components Limited
InventorManabu KOMIYAMA
Life of this patent
Estimating the term…
Abstract
An optical transmitter includes a laser configured to emit light, a power of the light increasing with temperature decreasing, a Faraday rotator configured to rotate a polarization direction of the light in accordance with the temperature, and a first polarizer that has a principal axis inclined at a given angle and inputs the light output from the Faraday rotator.
Claims10
An optical transmitter, comprising:
- a laser configured to emit light, a power of the light increasing with temperature decreasing;
- a Faraday rotator configured to rotate a polarization direction of the light in accordance with the temperature;
- and
- a first polarizer that has a principal axis inclined at a given angle and inputs the light output from the Faraday rotator.
1 more element
An optical transmission apparatus, comprising:
- a laser configured to emit light, a power of the light increasing with temperature decreasing;
- an optical attenuator whose insertion loss increases as the temperature decreases and that lets the light emitted from the laser pass through the optical attenuator;
- an output port configured to output the light that has passed through the optical attenuator;
- a measuring device configured to measure temperature of the laser;
- a memory configured to store association information obtained by associating the temperature measured by the measuring device with a value of a driving current with which quality of a waveform of the light output by the output port satisfies a certain condition;
- and
- a driver configured to drive the laser using the driving current having a value based on the temperature measured by the measuring device and the association information stored by the memory.
4 more elements
An optical transmitter, comprising:
- a laser configured to emit light, a power of the light increasing with temperature decreasing;
- an output port configured to output the light emitted from the laser;
- and
- a plate whose amount of bending changes in accordance with the temperature and that blocks part of the light emitted from the laser toward the output port in accordance with the amount of bending, an amount of light blocked by the plate increasing as the temperature decreases.
1 more element
Dependencies are inferred from the claim text.