SYSTEMS AND METHODS FOR SIDE-LOBE COMPENSATION IN RECONFIGURABLE OPTICAL ADD-DROP MULTIPLEXERS
First Claim
1. A reconfigurable optical add-drop multiplexer node with side-lobe compensation, comprising:
- an optical pre-amplifier comprising an input with multiple wavelengths;
a wavelength selective switch connected to the optical pre-amplifier, wherein the wavelength selective switch comprises a variable optical attenuator on a connection from the optical pre-amplifier and a filter for each of the multiple wavelengths, and wherein the wavelength selective switch is configured to drop a plurality of wavelengths of the multiple wavelengths;
an optical post-amplifier connected to a coupler comprising a variable optical attenuator on each of a plurality of input ports, wherein the coupler is configured to add a second plurality of wavelengths; and
an optical monitor configured to monitor optical power of each of the multiple wavelengths at the optical pre-amplifier.
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Abstract
Systems and methods to reduce passband side-lobes associated with WSS-based ROADMs by applying a filter on each channel are provided. In an exemplary embodiment, a comb filter, such as a thin film filter or an interleaver, is utilized. Additionally, the present invention provides systems and methods to adaptively control amplifier target power and per wavelength target power to maintain signal launching power as per design in networks with WSS-based ROADMs. Accordingly, signal OSNR does not collapse faster than other similar configured system without WSS-based ROADM. In order to correct amplifier target power, the present invention utilizes system information about side-lobe size and OSNR at each amplifier.
51 Citations
11 Claims
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1. A reconfigurable optical add-drop multiplexer node with side-lobe compensation, comprising:
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an optical pre-amplifier comprising an input with multiple wavelengths; a wavelength selective switch connected to the optical pre-amplifier, wherein the wavelength selective switch comprises a variable optical attenuator on a connection from the optical pre-amplifier and a filter for each of the multiple wavelengths, and wherein the wavelength selective switch is configured to drop a plurality of wavelengths of the multiple wavelengths; an optical post-amplifier connected to a coupler comprising a variable optical attenuator on each of a plurality of input ports, wherein the coupler is configured to add a second plurality of wavelengths; and an optical monitor configured to monitor optical power of each of the multiple wavelengths at the optical pre-amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wavelength selective switch with side-lobe compensation, comprising:
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an input port; a plurality of output ports connected to the input port through a switching device, wherein the switching device is configured to switch wavelengths from the input port to each of the plurality of output ports; and a comb filter configured to filter wavelengths input and output from the wavelength selective switch, wherein the comb filter comprises a passband at and around the center frequency of each of the wavelengths and attenuation at side-lobes for each of the wavelengths. - View Dependent Claims (9, 10, 11)
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Specification