Tunable filter device
AssigneeHon Hai Precision Ind. Co., Ltd.
InventorsCharles Leu, Ga-Lane Chen
Life of this patent
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Abstract
A tunable filter device (10) has a plurality of input waveguide channels (141, 142, 143), a plurality of output waveguide channels (161, 162, 163) and a Bragg grating (13) which are formed in a planar waveguide (111). Every input waveguide channel couples with the Bragg grating at a different angle, and every output waveguide channel is a mirror image of a particular input waveguide channel. When input light transmits through a particular input waveguide channel, light of a particular wavelength is reflected by the Bragg grating to a corresponding, mirror image output waveguide channel.
Claims19
A tunable filter device comprising:
- a planar waveguide with a plurality of input waveguide channels and a plurality of output waveguide channels;
- a Bragg grating located in the planar waveguide;
- said every input waveguide channel angularly merging at a different acute angle with a normal of the Bragg grating;
- and
- said every output waveguide channel being a mirror image of a corresponding input waveguide channel;
- wherein, when input light signals consisting of a plurality of different, spectrally separated wavelengths transmit in a particular input waveguide channel and incident on the Bragg grating, a light beam with a predetermined wavelength is reflected by the Bragg grating and transmits to an output waveguide channel which is a mirror image of the input waveguide channel.
A tunable filter device comprising:
- a planar waveguide;
- a plurality of input waveguide channels formed in the planar waveguide;
- a plurality of output waveguide channels formed in the planar waveguide;
- a Bragg grating located in the planar waveguide;
- said every input waveguide channel angularly merging at a different acute angle with a normal of the Bragg grating;
- said every output waveguide channel being a mirror image of a corresponding input waveguide channel;
- an input port;
- an output port;
- and
- an adjustable mechanism which controls coupling of light from the input port into a desired input waveguide channel.
A tunable filter device comprising:
- a waveguide defining a plurality of input waveguide channels and a plurality of output waveguide channels;
- a Bragg grating provided in the waveguide;
- said output waveguide channels and said input waveguide channels being located on a same side of the Bragg grating, and said output waveguide channels being roughly of mirror images of the corresponding input waveguide channels, respectively, with regard to said Bragg grating due to reflection;
- and
- input and output ports commonly controlled by an adjustable mechanism and located at said same side to align with the corresponding input and output waveguide channels;
- wherein
- a light beam transmitted into the input port is regulated by a formula of λi=2d/(1−(sin2θi/n2))0.5, where d and n are respectively a grating period and a refractive index of the Bragg grating, θi is an incident angle of the light beam on the Bragg grating, and λi is the wavelength of a reflected light beam obtained at the output port.
Dependencies are inferred from the claim text.