Optical-layer traffic grooming at an OFDM subcarrier level with photodetection conversion of an input optical OFDM to an electrical signal
First Claim
Patent Images
1. A reconfigurable add-drop multiplexer (ROADM) node, comprising:
- 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.
3 Assignments
0 Petitions
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.
-
Citations
6 Claims
-
1. A reconfigurable add-drop multiplexer (ROADM) node, comprising:
-
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 (2, 3, 4, 5, 6)
-
Specification