Light-receiving module
AssigneeNEC Corporation
InventorMasayuki Fujita
Life of this patent
Estimating the term…
Abstract
A light-receiving module having the characteristics of a tunable bandpass filter and applicable for receiving light signal from an optic fiber in the field of optical communication or optical information processing. The light-receiving module is coupled to the optical fiber and has a photo-detecting device for converting a light signal into an electric signal, a lens optically coupling said optical fiber and said photo-detecting device, and a bandpass filter plate provided between the photo-detecting device and the lens. The bandpass filter plate is supported such that it may rotate around an axis which is parallel to the face of the plate.
Claims15
A light-receiving module which is coupled to an optical fiber and receiving a light signal amplified by a fiber optic amplifier, comprising;
- a photo-detecting device for converting a light signal into an electric signal;
- a lens optically coupling one end of an optical fiber and said photo-detecting device;
- and
- a bandpass filter plate provided between said photo-detecting device and said lens, without any other component between said photo-detecting device and said bandpass filter plate, said bandpass filter plate being supported by a means effective for enabling said bandpass filter to be rotated around an axis which is parallel to its face to thereby enable adjusting a center of wavelength of transmission without reducing a light receiving sensitivity associated with transmission of light from said optical fiber to said photo-detecting device, wherein a light signal amplified by a fiber optic amplifier is emitted from said end of said fiber to said lens.
Light-receiving apparatus, comprising;
- an optical fiber amplifier for amplifying an input light signal;
- an optical fiber having a first end coupled to said fiber optic amplifier;
- a photo-detecting device for converting a light signal into an electric signal;
- a lens optically coupling a second end of said optical fiber to said photo-detecting device;
- and
- a bandpass filter plate provided between said photo-detecting device and said lens without any other component between said photo-detecting device and said bandpass filter plate, said bandpass filter plate being supported by a means effective for enabling said bandpass filter to be rotated around an axis which is parallel to its face, to thereby enable adjusting a center of wavelength of transmission without reducing a light receiving sensitivity associated with transmission of light from said optical fiber to said photo-detecting device, wherein the light signal amplified by a fiber optic amplifier is emitted from said end of said optical fiber to said lens.
Dependencies are inferred from the claim text.