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US 2003/0118061 A1Published application
Optical semiconductor module
OwnerKenji Masuda, Makoto Satoinventors
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Abstract
An optical semiconductor module has a laser diode (LD) for emitting light, a first photo-diode (PD) and a second PD for receiving light emitted from the LD, and a wavelength filter which is disposed on a light path between the LD and the first PD and continuously changes the intensity according to wavelength of the light. The first PD generates an output current which is 20% or above larger than that of the second PD at the same intensity of the entered lights.
Claims8
An optical semiconductor module comprising:
- a laser diode for emitting light;
- a first photo-diode and a second photo-diode for receiving the light emitted by the laser diode;
- and
- a wavelength filter disposed on a light path between the laser diode and the first photo-diode to continuously change intensity of the light according to wavelength of the light,
- wherein the first photo-diode generates 20% larger output current than the second photo-diode when they receive the light of the same intensity.
2 more elements
An optical semiconductor module comprising:
- a laser diode for emitting light;
- a first photo-diode and a second photo-diode for receiving the light emitted by the laser diode;
- and
- a wavelength filter disposed on a light path between the laser diode and the first photo-diode to continuously change intensity of the light according to wavelength of the light,
- wherein ratio of light receiving area of the first photo-diode to that of the second photo-diode is 1.2 or above.
2 more elements
An optical semiconductor module comprising:
- a laser diode for emitting light;
- a first photo-diode and a second photo-diode for receiving the light emitted by the laser diode;
- and
- a wavelength filter disposed on a light path between the laser diode and the first photo-diode to continuously change intensity of the light according to wavelength of the light,
- wherein the first photo-diode is composed of plural photo-diode elements.
2 more elements
An optical semiconductor module comprising:
- a laser diode for emitting light;
- a first photo-diode and a second photo-diode for receiving the light emitted by the laser diode;
- and
- a wavelength filter disposed on a light path between the laser diode and the first photo-diode to continuously change intensity of the light according to wavelength of the light,
- wherein the first photo-diode is located on opposite to a principal ray emitted from the laser diode.
2 more elements
Dependencies are inferred from the claim text.