RECONFIGURABLE OPTICAL ADD/DROP MULTIPLEXER AND PROCEDURE FOR OUTPUTTING OPTICAL SIGNALS FROM SUCH MULTIPLEXER
First Claim
1. A reconfigurable optical add drop multiplexer (ROADM) comprising:
- a plurality of local interfaces at which optical signals of different wavelengths are locally input into the ROADM and have a first minimum frequency difference when all of the local interfaces input the optical signals;
a first network interface configured to connect the ROADM to a network from which multiplexed optical signals of different wavelengths are transmitted to the network; and
a device configured to control the input or processing of optical signals input into the ROADM so that the input optical signals that are transmitted from the first network interface to the network have a second minimum frequency difference that is greater than the first minimum frequency difference.
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Accused Products
Abstract
A reconfigurable optical add drop multiplexer (ROADM) includes local interfaces at which optical signals of different wavelengths are locally input into the ROADM, and a network interface configured to connect the ROADM to a network from which multiplexed optical signals of different wavelengths are transmitted to the network. In a first configuration, the ROADM is configured to transmit from the network interface to the network multiplexed signals of different wavelengths having a first minimum frequency difference. In a second configuration, the ROADM is configured to transmit from the network interface to the network multiplexed signals of different wavelengths having a second minimum frequency difference. The second minimum frequency difference is greater than the first minimum frequency difference. This arrangement reduces the power of four wave mixing cross products produced when optical signals of three wavelengths are multiplexed and transmitted from the ROADM to NZDSF or DSF fiber types.
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Citations
28 Claims
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1. A reconfigurable optical add drop multiplexer (ROADM) comprising:
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a plurality of local interfaces at which optical signals of different wavelengths are locally input into the ROADM and have a first minimum frequency difference when all of the local interfaces input the optical signals; a first network interface configured to connect the ROADM to a network from which multiplexed optical signals of different wavelengths are transmitted to the network; and a device configured to control the input or processing of optical signals input into the ROADM so that the input optical signals that are transmitted from the first network interface to the network have a second minimum frequency difference that is greater than the first minimum frequency difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A reconfigurable optical add drop multiplexer (ROADM), comprising:
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a plurality of add ports at which optical signals of different wavelengths are locally input into the ROADM, two of the add ports at which optical signals of adjacent center wavelength values are input being denoted as adjacent add ports; a device configured to control the inputting or processing of optical signals input into the plurality of add ports so that for at least two pairs of optical signals input at two adjacent add ports, the center wavelength difference of optical signals input at one add port pair is different than the center wavelength difference of optical signals input at the other add port pair; and a network interface from which optical signals of different wavelengths input at the plurality of add ports and controlled by the device are transmitted to the network. - View Dependent Claims (11, 12, 13)
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14. An optical node comprising:
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an input interface configured to receive at least one input optical signal of a plurality of different input wavelengths having a first minimum frequency difference; an output interface through which at least one output optical signal of a plurality of different output wavelengths is transmitted; and an optical node element configured to change the frequency of at least one input wavelength to a different frequency so that when the changed-frequency input wavelength is incorporated into the output optical signal, the output optical signal has a second minimum frequency difference that is greater than the first minimum frequency difference. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A procedure for controlling optical signals of different wavelength input into a reconfigurable optical add drop multiplexer (ROADM) and having a first minimum frequency difference when all local interfaces of the ROADM input the optical signals, comprising:
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inputting optical signals of different wavelengths into the ROADM; and controlling the inputting or processing of the optical signals input into the ROADM so that the input optical signals that are transmitted from a first network interface of the ROADM to a network have a second minimum frequency difference that is greater than the first minimum frequency difference. - View Dependent Claims (21, 22, 23, 24)
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25. A procedure for controlling optical signals of different wavelength input into a reconfigurable optical add drop multiplexer (ROADM), comprising:
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inputting optical signals of different wavelengths into the ROADM; and controlling the inputting or processing of the optical signals input in the inputting operation so as to output from the ROADM a multiplexed optical signal of at least three wavelengths such that for at least two pairs of adjacent wavelengths, the center wavelength difference of one pair of adjacent wavelengths is different than the center wavelength difference of the other pair of adjacent wavelengths. - View Dependent Claims (26, 27, 28)
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Specification