Optical device
AssigneeFujitsu Optical Components Limited
InventorNobuaki Mitamura
Life of this patent
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Abstract
When environmental temperature becomes low, the quantity of light of the backward output light irradiated onto a light absorber formed on a mount over which a chip is mounted, is increased by a light quantity adjuster, to increase the optical absorption by the light absorber, thereby raising its temperature. As a result, the temperature of the chip on the mount rises, thereby enabling to substantially narrow a temperature range on a low temperature side. Accordingly, an optical device with low power consumption that can satisfy characteristics required for signal transmission at a required rate over a wide temperature range can be provided.
Claims13
An optical device comprising:
- a chip adapted to output laser beams forward and backward;
- a mount having the chip mounted thereover;
- a light absorber formed on the mount to absorb backward output light from the chip, thereby raising its temperature;
- and
- a light quantity adjuster arranged in an area where the backward output light from the chip propagates, to increase the quantity of light of the backward output light irradiated onto the light absorber, when environmental temperature changes to a low temperature side within an operating temperature range.
Dependencies are inferred from the claim text.