Differential quadrature phase-shift keying transmission system with variable transmission rate
AssigneeCisco Technology, Inc.
InventorsFabrizio Forghieri, Luca Della Chiesa
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Abstract
Methods and apparatus for varying the transmission rate of a signal transmitted within a dense wavelength division multiplexing (DWDM) system or network are disclosed. According to one aspect of the present invention, a method includes obtaining a first signal and determining a transmission rate associated with the first. If it is determined that the transmission rate is a first rate, the method includes processing the first signal as having a first transmission format and the first rate. Alternatively, it is determined that the transmission rate is not the first rate and is a second rate, the method includes processing the first signal as having a second transmission format and a second rate.
Claims23
a method of processing signals in a dense wavelength division multiplexing (DWDM) system, the method comprising:
- obtaining a first signal;
- determining a transmission rate associated with the first signal, wherein determining the transmission rate associated with the first signal includes determining if an optical signal-to-noise-ratio (OSNR) associated with the first signal is sufficient for a particular level of performance;
- processing the first signal as having a first transmission format and a first rate if it is determined that the transmission rate associated with the first signal is the first rate;
- and processing the first signal as having a second transmission format and a second rate if it is determined that the transmission rate associated with the first signal is the second rate.
a non-transitory tangible media encoded with computer-readable logic containing instructions for execution and when executed operable to:
- obtain a first signal;
- determine a transmission rate associated with the first signal, wherein the logic operable to determine the transmission rate associated with the first signal is further operable to determine if an optical signal-to-noise-ratio associated with the first signal is sufficient for a particular level of performance;
- process the first signal as having a first transmission format and a first rate if it is determined that the transmission rate associated with the first signal is the first rate;
- and process the first signal as having a second transmission format and a second rate if it is determined that the transmission rate associated with the first signal is the second rate.
an apparatus comprising:
- a first circuit, the first circuit being capable of obtaining a first signal, the first signal having a first transmission rate, the first circuit further being capable of obtaining a second signal, the second signal having a second transmission rate;
- a second circuit, the second circuit being capable of processing the first signal, wherein processing the first signal includes processing the first signal using a first transmission format, the second circuit further being capable of processing the second signal, wherein processing the second signal includes processing the second signal using a second transmission format;
- and a third circuit, the third circuit including clock data recovery functionality, a multiplexer, and a demultiplexer.
an apparatus comprising:
- means for obtaining a first signal;
- means for determining a transmission rate associated with the first signal, wherein the means for determining the transmission rate associated with the first signal include means for determining if an optical signal-to-noise ratio (OSNR) associated with the first signal is sufficient for a particular level of performance;
- means for processing the first signal as having a first transmission format and a first rate if it is determined that the transmission rate associated with the first signal is the first rate;
- and means for processing the first signal as having a second transmission format and a second rate if it is determined that the transmission rate associated with the first signal is the second rate.
Dependencies are inferred from the claim text.