Flexible band tunable filter
First Claim
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1. A device for an optical communication network comprising:
- a first tunable edge filter that is adapted to receive an input signal and to drop a first range of channels in the input signal; and
a second tunable edge filter that is adapted to receive a dropped signal from the first tunable edge filter and that is adapted to drop a second range of channels from the dropped signal from the first tunable edge filter, such that an intersection between the first range of channels and the second range of channels defines a tunable passband for, the device.
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Abstract
A flexible band tunable filter design is disclosed which is capable of selecting any single channel or multiple of adjacent channels in a waveband of an optical signal in an optical communication network. The flexible band tunable filter has particular application in wavelength division multiplexing communication networks.
12 Citations
20 Claims
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1. A device for an optical communication network comprising:
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a first tunable edge filter that is adapted to receive an input signal and to drop a first range of channels in the input signal; and
a second tunable edge filter that is adapted to receive a dropped signal from the first tunable edge filter and that is adapted to drop a second range of channels from the dropped signal from the first tunable edge filter, such that an intersection between the first range of channels and the second range of channels defines a tunable passband for, the device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical communication device comprising:
a first and second tunable filter connected in series, the first tunable filter having a passband with a rising edge that lies outside an operating spectrum for the device, and the second tunable filter having a passband with a falling edge that lies outside the operating spectrum for the device. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for filtering an optical communication signal comprising:
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receiving an input signal;
dropping a first range of channels in the input signal using a first tunable edge filter; and
dropping a second range of channels from a signal comprising the first range of channels dropped from the first tunable edge filter using a second tunable edge filter, such that an intersection between the first range of channels and the second range of channels defines a tunable passband. - View Dependent Claims (16, 17)
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18. A device for an optical communication network comprising:
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a diffraction grating that receives an input signal and creates a spectrally dispersed signal; and
a pair of shutters that selectively block portions of the spectrally dispersed signal so as to define a tunable passband for the device. - View Dependent Claims (19, 20)
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Specification