OPTICAL-LAYER TRAFFIC GROOMING AT AN OFDM SUBCARRIER LEVEL WITH PHOTODETECTION CONVERSION OF AN INPUT OPTICAL OFDM TO AN ELECTRICAL SIGNAL
First Claim
1. A method for optical layer traffic grooming comprising the steps of:
- receiving at least two optical input signals into respective optical receivers, each said optical receiver having a photodetector for converting the respective optical input signal into a respective electrical signal;
a grooming processor responsive to said electrical signals, said grooming processor being a radio frequency RF processor for processing the electrical signals at a subcarrier level to produce an RF orthogonal frequency division multiplexing signal OFDM signal; and
modulating the groomed RF OFDM signal at a transmitter for conversion of the groomed RF OFDM into an optical signal.
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Accused Products
Abstract
A method for optical layer traffic grooming includes receiving at least two optical input signals into respective optical receivers, each optical receiver having a photodetector for converting the respective optical input signal into a respective electrical signal; a grooming processor responsive to the electrical signals, the grooming processor being a radio frequency RF processor for processing the electrical signals at a subcarrier level to produce an RF orthogonal frequency division multiplexing signal OFDM signal; and modulating the groomed RF OFDM signal at a transmitter for conversion of the groomed RF OFDM into an optical signal.
39 Citations
18 Claims
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1. A method for optical layer traffic grooming comprising the steps of:
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receiving at least two optical input signals into respective optical receivers, each said optical receiver having a photodetector for converting the respective optical input signal into a respective electrical signal; a grooming processor responsive to said electrical signals, said grooming processor being a radio frequency RF processor for processing the electrical signals at a subcarrier level to produce an RF orthogonal frequency division multiplexing signal OFDM signal; and modulating the groomed RF OFDM signal at a transmitter for conversion of the groomed RF OFDM into an optical signal. - View Dependent Claims (2, 3, 4, 5, 6, 18)
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7. A signal grooming system, comprising:
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at least two receivers, each configured to receive an input signal having one or more modulated subcarriers;
each said optical receiver having a photodetector for converting the respective optical input signal into a respective electrical signal;a grooming processor configured to arrange the modulated input subcarriers at the subcarrier level into one or more modulated output subcarriers according to a grooming operation such that the modulated subcarriers are not demodulated or decoded prior to grooming, said grooming processor being a radio frequency RF processor for processing the electrical signals at a subcarrier level to produce an RF orthogonal frequency division multiplexing signal OFDM signal; and a transmitter for modulating the groomed RF OFDM signal by conversion of the groomed RF OFDM into an optical signal. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A reconfigurable add-drop multiplexer (ROADM) node, comprising:
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one or more reconfigurable optical add/drop multiplexer subsystems, each configured to accept an input signal and to pass said input signal to each other ROADM subsystem for retransmission; an add/drop aggregator configured to receive the input signals from each of the ROADM subsystems and to control adding and dropping operations on the input signals; a grooming subsystem, comprising; at least two receivers, each configured to receive an input signal having one or more modulated subcarriers;
each said optical receiver having a photodetector for converting the respective optical input signal into a respective electrical signal;a grooming processor configured to arrange the modulated input subcarriers at the subcarrier level into one or more modulated output subcarriers according to a grooming operation such that the modulated subcarriers are not demodulated or decoded prior to grooming, said grooming processor being a radio frequency RF processor for processing the electrical signals at a subcarrier level to produce an RF orthogonal frequency division multiplexing signal OFDM signal; and a transmitter FOR modulating the groomed RF OFDM signal by conversion of the groomed RF OFDM into an optical signal. - View Dependent Claims (14, 15, 16, 17)
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Specification