| 摘要 |
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.
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