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US 6,204,942 B1Granted
Demultiplexing with clocked optical receivers
AssigneeLucent Technologies Inc.
InventorsAnthony Lodovico Lentine, Ted Kirk Woodward
Life of this patent
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Abstract
An optical demultiplexer demultiplexes an N channel multiplexed optical data signal, at a first data rate, into N signal data channels. The demultiplexing is provided by N optical receivers, each receiver receiving a clock signal and the multiplexed optical data signal which is demultiplexed into a different one of the N signal data channels. In another embodiment, a shared photodetector converts the received multiplexed optical data signal into a multiplexed data signal which is then used by all of the N receivers.
Claims20
An optical demultiplexer comprising
- means for receiving an N channel multiplexed optical data signal, at a first data rate, formed from N signal data channels multiplexed together, the N signal data channels operating at a second data rate, where the first data rate is N times the second data rate, and where N is an integer >1 and
- N clocked receivers, each receiver including an edge-triggered electrical sampler circuit which uses a different phase-delayed electrical clock signal to trigger the receiver, the clock signal operating at the second data rate and having a pulse width duty cycle which is independent of the first data rate, said sampler operates in response to a rising or falling edge of the clock signal, each receiver receiving the multiplexed optical data signal and demultiplexing it into a different one of the N signal data channels of the multiplexed optical data signal.
An optical demultiplexer comprising
- means for receiving an N channel multiplexed optical data signal, at a first data rate, formed from N signal data channels multiplexed together, the N signal data channels operating at a second data rate, where the first data rate is N times the second data rate, and, where N is an integer >1,
- a photodetector converting the received multiplexed optical data signal into an electrical multiplexed data signal and
- N clocked receivers, each receiver including an edge-triggered electrical sampler circuit which uses a different phase-delayed electrical clock signal to trigger the receiver, the clock signal operating at the second data rate and having a pulse width duty cycle which is independent of the first data rate, said sampler operates in response to a rising or falling edge of the clock signal, each receiver receiving the electrical multiplexed data signal and demultiplexing it into a different one of the N signal data channels of the multiplexed optical data signal.
Dependencies are inferred from the claim text.