Long haul optical communication system
First Claim
1. A transmitter for use in an optical communication system, said transmitter comprising means for generating a stream of RZ optical pulses in which alternate ones of such pulses have essentially orthogonal polarizations, and means for modulating the phase of said optical pulses as a function of input data applied to said transmitter.
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Accused Products
Abstract
A high bit rate, long haul optical communication system encodes a polarization interleaved stream of RZ optical pulses using phase shift keying (PSK) or differential phase shift keying (DPSK), in contrast to conventional on-off keying (OOK). The polarization interleaved stream of RZ optical pulses can be used for PSK or DPSK encoding of either one data stream having a bit rate that is the same as the optical stream pulse rate, or two (or more) independent data streams which individually each have lower bit rates, but which, when combined, have the same rate as the optical stream pulse rate. The latter arrangement essentially accomplishes polarization multiplexing (P-MUX). Individual wavelengths can be combined in a WDM or DWDM system, wherein, at the transmitter, multiple streams of polarization interleaved pulses, each stream having a different wavelength, are combined. At the receiver, the received combined signal is wavelength division demultiplexed, and the encoded data in each wavelength channel is recovered by a PSK or DPSK receiver, which, in the DPSK example, usually consists of a delay demodulator and a balanced detector. The transmission medium and laser power may be managed, for example so that the pulse transmission comprises solitons.
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Citations
16 Claims
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1. A transmitter for use in an optical communication system, said transmitter comprising
means for generating a stream of RZ optical pulses in which alternate ones of such pulses have essentially orthogonal polarizations, and means for modulating the phase of said optical pulses as a function of input data applied to said transmitter.
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4. A transmitter for use in an optical communication system, said transmitter comprising
means for generating first and second streams of RZ optical pulses in which pulses is said first stream have essentially orthogonal polarizations with respect to pulses in said second stream, and means for modulating the phase of said optical pulses in said first and second streams as a function of first and second streams of input data applied to said transmitter, respectively.
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7. An optical communication system arranged to transmit at least one stream of input data from a transmitter to a remote receiver, said system comprising
a transmitter for generating a stream of Rz optical pulses in which alternate ones of such pulses have essentially orthogonal polarizations, and for modulating the phase of said optical pulses as a function of said input data applied to said transmitter, and an optical communication channel for transmitting the modulated optical pulses from said transmitter to said remote receiver.
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9. A method for transmitting input data using an optical communication system, said method comprising the steps of
generating a stream of RZ optical pulses in which alternate ones of such pulses have essentially orthogonal polarizations, and modulating the phase of said optical pulses as a function of said input data.
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12. A method for transmitting input data using an optical communication system, said method comprising the steps of
generating first and second streams of RZ optical pulses in which pulses is said first stream have essentially orthogonal polarizations with respect to pulses in said second stream, and modulating the phase of said optical pulses in said first and second streams as a function of first and second streams of input data, respectively.
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15. An optical communication method for transmitting at least one stream of input data from a transmitter to a remote receiver, said method comprising the steps of
generating a stream of RZ optical pulses in which alternate ones of such pulses have essentially orthogonal polarizations, and modulating the phase of said optical pulses as a function of said input data applied to said transmitter, and transmitting the modulated optical pulses from said transmitter to said remote receiver via an optical communication channel.
Specification