Simplified gain flattening and tap device
AssigneeFinisar Corporation
InventorsYonglin Huang, Jian Liu, Qi Deng, Liren Du, Steve Wang
Life of this patent
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Abstract
A gain flattening and tap device. A gain flattening filter for use in fiber-optic communications includes a substrate. A GFF film is formed on a first surface of the substrate. An HR film is formed on a second surface of the substrate. The HR film is arranged to receive light from the GFF film and to reflect at least some of the light back through the GFF film. By passing the light through the GFF film multiple times, the effectiveness of the GFF film is multiplied. Further, by constructing the HR film to allow portions of the light to pass through, a tap may be implemented with the GFF.
Claims28
A gain flattening filter for use in fiber optic communications, the gain flattening filter comprising:
- a substrate having a first surface and a second surface;
- a first film disposed on the first surface of the substrate, the first film configured to attenuate one or more channels in a light signal;
- and
- a second film disposed on the second surface of the substrate, the second film arranged to receive the light signal from the first film and to reflect at least a portion of the light signal back through the first film that attenuates the one or more channels a second time.
A gain flattening filter for use in fiber optic communications, the gain flattening filter comprising:
- a substrate having a first surface and a second surface;
- a first film disposed on the first surface of the substrate, the first film configured to attenuate one or more channels in a light signal;
- an second film disposed on the second surface of the substrate, the second film arranged to receive the light signal from the first film and to reflect at least a portion of the light signal back through the first film, that attenuates the one or more channels;
- an input port adapted to direct an input light signal into the gain flattening filter;
- and
- an output port adapted to receive an output light signal reflected by the second film.
A method of manufacturing a fiber optic component that includes a gain flattening filter, the method comprising:
- forming a GFF film on a first surface of an optical substrate;
- and
- forming an HR film on a second surface of an optical substrate, wherein forming an HR film on a second surface comprises arranging the HR film so that the HR film is configured to receive light that has pass through the GFF film and to reflect at least a portion of the light back to the GFF film.
A method of equalizing non-uniform gain in an optical signal comprising:
- passing a light signal through GFF film;
- passing the light signal from the GFF film through a substrate to an HR film;
- reflecting the light signal at the HR film back through the GFF film;
- and
- directing the reflected light signal into an output port.
A gain flattening filter for use in fiber optic communications, the gain flattening filter comprising:
- a substrate having a first surface and a second surface;
- a first film disposed on the first surface of the substrate, the first film configured to reflect at least a portion of a light signal;
- and
- an second film disposed on the first film, the second film configured to attenuate one or more channels of the light signal.
A gain flattening filter for use in fiber optic communications, the gain flattening filter comprising:
- a substrate having a first surface, a second surface and a third surface;
- a first film disposed on the first surface of the substrate, the first film configured to attenuate one or more channels in a light signal;
- a second film disposed on the second surface of the substrate, the second film configured to attenuate one or more channels in a light signal;
- and
- a third film disposed on the third surface of the substrate, the third film arranged to receive the light signal from the first film and to reflect at least a portion of the light to the second film.
Dependencies are inferred from the claim text.