WAVELENGTH SELECTIVE SWITCH AND METHOD FOR CORRECTING DEVIATION OF WAVELENGTH
First Claim
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1. A wavelength selective switch comprising:
- an input port and an output port;
a wavelength demultiplexer that demultiplexes wavelength-multiplexed signal light into wavelengths in different optical paths;
an optical-path controller that controls an array that has a plurality of switch elements, the plurality of switch elements switching all or a part of the wavelengths to be coupled from the input port to the output port; and
an actuator driver that shifts the plurality of switch elements, based on a deviation of a center wavelength of a pass band from a reference wavelength.
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Abstract
A wavelength selective switch includes an input port and an output port, a wavelength demultiplexer that demultiplexes wavelength-multiplexed signal light into wavelengths in different optical paths, an optical-path controller that controls an array that has a plurality of switch elements, the plurality of switch elements switching all or a part of the wavelengths to be coupled from the input port to the output port, and an actuator driver that shifts the plurality of switch elements, based on a deviation of a center wavelength of a pass band from a reference wavelength.
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Citations
20 Claims
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1. A wavelength selective switch comprising:
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an input port and an output port; a wavelength demultiplexer that demultiplexes wavelength-multiplexed signal light into wavelengths in different optical paths; an optical-path controller that controls an array that has a plurality of switch elements, the plurality of switch elements switching all or a part of the wavelengths to be coupled from the input port to the output port; and an actuator driver that shifts the plurality of switch elements, based on a deviation of a center wavelength of a pass band from a reference wavelength.
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2. A wavelength selective switch comprising:
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an input port and an output port; a wavelength demultiplexer that demultiplexes wavelength-multiplexed signal light into wavelengths in different optical paths; an optical-path controller that controls an array that has a plurality of switch elements, the plurality of switch elements switching all or a part of the wavelengths to be coupled from the input port to the output port, the optical-path controller including an actuator driver that shifts, based on a deviation of a center wavelength of a pass band of the amplified spontaneously emitted light from a reference wavelength; and an optical channel monitor that monitors the wavelength-multiplexed signal light coupled to the output port, the optical channel monitor including an ASE light detector and an ASE light signal processor, the ASE light detector detecting amplified spontaneously emitted light from at least one of the side of a short wavelength of the wavelength-multiplexed signal and the side of a long wavelength of the wavelength-multiplexed signal, and an ASE light signal processor calculating the deviation of the center wavelength of a pass band of the amplified spontaneously emitted light from the reference wavelength. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A wavelength selective switch that is used for a wavelength multiplexing communication system, comprising:
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switch elements that correspond to a plurality of wavelengths multiplexed into an optical signal, respectively; and at least other three switch elements that correspond to amplified spontaneously emitted light that has different wavelengths from the plurality of wavelengths, wherein an attenuation rate of a switch element that is among the other three switch elements and corresponds to the amplified spontaneously emitted light is set to a minimal rate, and attenuation rates of the switch elements that are among the other three switch elements and located on both sides of the switch element whose attenuation rate is set to the minimal rate are set to a maximal rate, wherein light monitor configured to measure the center wavelength of a pass band of the amplified spontaneously emitted light, wherein a deviation of the center wavelength of pass band of the amplified spontaneously emitted light from a reference wavelength is calculated, and wherein positions at which light with the wavelengths is incident on the switch elements corresponding to the plurality of wavelengths are relatively shifted so that the deviation is offset. - View Dependent Claims (19, 20)
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Specification