Tunable optical demultiplexer
First Claim
1. An optical device, comprising:
- an optical demultiplexer; and
a control circuit coupled to the optical demultiplexer, the control circuit including a memory configured to store first and second parameter values, the memory being selected from the group consisting of a read only memory and a random access memory, wherein, in response to a first input to the control circuit, the control circuit generates a first control signal based on the first parameter value, and, in response to the first control signal, the optical demultiplexer has a first transmission characteristic, which includes a first plurality of transmission maxima, each of which corresponding to a first plurality of wavelengths, each of the first plurality of wavelengths being separated from one another by a spectral spacing and conforming to a first wavelength grid,in response to a second input to the control circuit, the control circuit generates a second control signal based on the second parameter value, and, in response to the second control signal, the optical demultiplexer has a second transmission characteristic, which includes a second plurality of transmission maxima, each of which corresponding to a second plurality of wavelengths, each of the second plurality of wavelengths being separated from one another by the spectral spacing and conforming to a second wavelength grid, the second wavelength grid being spectrally shifted relative to the first wavelength grid; and
a heater,wherein the optical demultiplexer includes an optical de-interleaver andwherein the heater is thermally coupled to the optical de-interleaver and the control signal includes a first electrical current or a second electrical current, the control signal being supplied to the heater, such that, when the control signal includes the first electrical current, the optical demultiplexer has a first temperature and a first transmission characteristic, and, when the control signal includes the second electrical current, the optical demultiplexer has a second temperature and a second transmission characteristic.
1 Assignment
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Accused Products
Abstract
A tunable optical demultiplexer includes a control circuit and one or more heaters thermally coupled to waveguides of an optical demux. The control circuit is in signal communication with the one or more heaters and includes a processor coupled to a memory. The control circuit is configured to receive an optical channel group (OCG) identification signal and adjust the power delivered to the heaters in response to the OCG identification signal and based on parameter values stored in the memory. The optical demux outputs a plurality of optical signals at a corresponding one of a plurality of outputs. The transmission characteristics of the optical demux are varied depending on the amount of power delivered to the heaters. The varying of the transmission characteristics of the optical demux adjusts the spectral shifting of the plurality of wavelengths output by the optical demux.
18 Citations
27 Claims
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1. An optical device, comprising:
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an optical demultiplexer; and a control circuit coupled to the optical demultiplexer, the control circuit including a memory configured to store first and second parameter values, the memory being selected from the group consisting of a read only memory and a random access memory, wherein, in response to a first input to the control circuit, the control circuit generates a first control signal based on the first parameter value, and, in response to the first control signal, the optical demultiplexer has a first transmission characteristic, which includes a first plurality of transmission maxima, each of which corresponding to a first plurality of wavelengths, each of the first plurality of wavelengths being separated from one another by a spectral spacing and conforming to a first wavelength grid, in response to a second input to the control circuit, the control circuit generates a second control signal based on the second parameter value, and, in response to the second control signal, the optical demultiplexer has a second transmission characteristic, which includes a second plurality of transmission maxima, each of which corresponding to a second plurality of wavelengths, each of the second plurality of wavelengths being separated from one another by the spectral spacing and conforming to a second wavelength grid, the second wavelength grid being spectrally shifted relative to the first wavelength grid; and a heater, wherein the optical demultiplexer includes an optical de-interleaver and wherein the heater is thermally coupled to the optical de-interleaver and the control signal includes a first electrical current or a second electrical current, the control signal being supplied to the heater, such that, when the control signal includes the first electrical current, the optical demultiplexer has a first temperature and a first transmission characteristic, and, when the control signal includes the second electrical current, the optical demultiplexer has a second temperature and a second transmission characteristic. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An optical device, comprising:
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an optical demultiplexer including a plurality of outputs; a control circuit including a memory configured to store first and second parameter values, the memory being selected from the group consisting of a read only memory and a random access memory, the control circuit in signal communication with the optical demultiplexer; and a heater, wherein, in response to a first input to the control circuit, the control circuit generates a first control signal based on the first parameter value, and, in response to the first control signal, the optical demultiplexer outputs a first plurality of optical signals at a corresponding one of the plurality of outputs, each of the plurality of optical signals has a corresponding one of a first plurality of wavelengths, each of the first plurality of wavelengths being separated from one another by a spectral spacing and conforming to a first wavelength grid, in response to a second input to the control circuit, the control circuit generates a second control signal based on the second parameter value, and, in response to the second control signal, the optical demultiplexer outputs a second plurality of optical signals at a respective one of the plurality of outputs, each of the second plurality of optical signals corresponding to one of a second plurality of wavelengths, each of the second plurality of wavelengths being separated from one another by the spectral spacing and conforming to a second wavelength grid, the second wavelength grid being spectrally shifted relative to the first wavelength grid, the optical demultiplexer includes a first optical de-interleaver, the heater is thermally coupled to the optical de-interleaver, and wherein the control signal includes a first electrical current or a second electrical current, the control signal being supplied to the heater, such that, when the control signal includes the first electrical current, the heater has a first temperature and the optical demultiplexer has a first transmission characteristic and when the control signal includes the second electrical current, the heater has a second temperature and the optical demultiplexer has a second transmission characteristic. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. An optical device, comprising:
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an optical demultiplexer; and a control circuit coupled to the optical demultiplexer, the control circuit including a memory configured to store first and second parameter values, wherein, in response to a first input to the control circuit, the control circuit generates a first control signal based on the first parameter value, and, in response to the first control signal, the optical demultiplexer has a first transmission characteristic, which includes a first plurality of transmission maxima, each of which corresponding to a first plurality of wavelengths, each of the first plurality of wavelengths being separated from one another by a spectral spacing and conforming to a first wavelength grid, and in response to a second input to the control circuit, the control circuit generates a second control signal based on the second parameter value, and, in response to the second control signal, the optical demultiplexer has a second transmission characteristic, which includes a second plurality of transmission maxima, each of which corresponding to a second plurality of wavelengths, each of the second plurality of wavelengths being separated from one another by the spectral spacing and conforming to a second wavelength grid, the second wavelength grid being spectrally shifted relative to the first wavelength grid, wherein the optical demultiplexer includes an optical de-interleaver, the optical device, further including; a heater thermally coupled to the optical de-interleaver, wherein the control signal includes a first electrical current or a second electrical current, the control signal being supplied to the heater, such that, when the control signal includes the first electrical current, the optical demultiplexer has a first temperature and a first transmission characteristic, and, when the control signal includes the second electrical current, the optical demultiplexer has a second, temperature and a second transmission characteristic. - View Dependent Claims (16)
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17. An optical device, comprising:
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an optical demultiplexer; and a control circuit coupled to the optical demultiplexer, the control circuit including a memory configured to store first and second parameter values, wherein, in response to a first input to the control circuit, the control circuit generates a first control signal based on the first parameter value, and, in response to the first control signal, the optical demultiplexer has a first transmission characteristic, which includes a first plurality of transmission maxima, each of which corresponding to a first plurality of wavelengths, each of the first plurality of wavelengths being separated from one another by a spectral spacing and conforming to a first wavelength grid, and in response to a second input to the control circuit, the control circuit generates a second control signal based on the second parameter value, and, in response to the second control signal, the optical demultiplexer has a second transmission characteristic, which includes a second plurality of transmission maxima, each of which corresponding to a second plurality of wavelengths, each of the second plurality of wavelengths being separated from one another by the spectral spacing and conforming to a second wavelength grid, the second wavelength grid being spectrally shifted relative to the first wavelength grid, wherein the optical demultiplexer includes a first Mach-Zehnder (MZ) interferometer including an input, first and second waveguides, and a pair of outputs, the first MZ interferometer receiving a wavelength division multiplexed (WDM) optical input signal having a plurality of channels, each of the channels corresponding to a wavelength, the MZ interferometer configured to output a first subset of the plurality of channels at the first output and a second subset of the plurality of channels at a second output. - View Dependent Claims (18, 19, 20)
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21. An optical device, comprising:
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an optical demultiplexer including a plurality of outputs; and a control circuit including a memory configured to store first and second parameter values, the control circuit in signal communication with the optical demultiplexer, wherein, in response to a first input to the control circuit, the control circuit generates a first control signal based on the first parameter value, and, in response to the first control signal, the optical demultiplexer outputs a first plurality of optical signals at a corresponding one of the plurality of outputs, each of the plurality of optical signals has a corresponding one of a first plurality of wavelengths, each of the first plurality of wavelengths being separated from one another by a spectral spacing and conforming to a first wavelength grid, and in response to a second input to the control circuit, the control circuit generates a second control signal based on the second parameter value, and, in response to the second control signal, the optical demultiplexer outputs a second plurality of optical signals at a respective one of the plurality of outputs, each of the second plurality of optical signals corresponding to one of a second plurality of wavelengths, each of the second plurality of wavelengths being separated from one another by the spectral spacing and conforming to a second wavelength grid, the second wavelength grid being spectrally shifted relative to the first wavelength grid, wherein the optical demultiplexer includes a first optical de-interleaver, the optical device further including a heater thermally coupled to the optical de-interleaver, wherein the control signal includes a first electrical current or a second electrical current, the control signal being supplied to the heater, such that, when the control signal includes the first electrical current, the heater has a first temperature and the optical demultiplexer has a first transmission characteristic, and, when the control signal includes the second electrical current, the heater has a second temperature and the optical demultiplexer has a second transmission characteristic. - View Dependent Claims (22)
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23. An optical device, comprising:
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an optical demultiplexer including a plurality of outputs; and a control circuit including a memory configured to store first and second parameter values, the control circuit in signal communication with the optical demultiplexer, wherein, in response to a first input to the control circuit, the control circuit generates, a first control signal based on the first parameter value, and, in response to the first control signal, the optical demultiplexer outputs a first plurality of optical signals at a corresponding one of the plurality of outputs, each of the plurality of optical signals has a corresponding one of a first plurality of wavelengths, each of the first plurality of wavelengths being separated from one another by a spectral spacing and conforming to a first wavelength grid, and in response to a second input to the control circuit, the control circuit generates a second control signal based on the second parameter value, and, in response to the second control signal, the optical demultiplexer outputs a second plurality of optical signals at a respective one of the plurality of outputs, each of the second plurality of optical signals corresponding to one of a second plurality of wavelengths, each of the second plurality of wavelengths being separated from one another by the spectral spacing and conforming to a second wavelength grid, the second wavelength grid being spectrally shifted relative to the first wavelength grid, wherein the optical demultiplexer includes a first optical de-interleaver, wherein the optical demultiplexer includes a second optical de-interleaver, the demultiplexer further comprising; a polarization beam splitter configured to receive a wavelength division multiplexed (WDM) optical input signal at an input and output a first polarized optical signal to the first optical de-interleaver and a second polarized optical signal to the second optical de-interleaver. - View Dependent Claims (24, 25, 26, 27)
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Specification