Optical Transmission Method and Optical Receiver Apparatus
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Accused Products
Abstract
An optical transmission method (10) comprising steps of receiving (12) a communication signal comprising symbols for transmission. The method comprises performing (16) linear amplitude modulation of an optical carrier with the communication signal to generate an amplitude modulated optical carrier. The method comprises performing low-pass filtering (14) to reduce a bandwidth of the symbols to less than a Nyquist bandwidth of the symbols. The method comprises transmitting (18) the amplitude modulated optical carrier. The method further comprises receiving (20) the amplitude modulated optical carrier following transmission and performing direct detection of the received amplitude modulated optical carrier to generate a received electrical signal; and determining (22) received symbols from the received electrical signal using an indication of a nonlinear impulse response of the direct detection.
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Citations
36 Claims
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1-17. -17. (canceled)
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18. An optical transmission method comprising:
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receiving a communication signal comprising symbols for transmission; performing amplitude modulation of an optical carrier with the communication signal to generate an amplitude-modulated optical carrier; performing low-pass filtering to reduce a bandwidth of the amplitude-modulated optical carrier to less than a Nyquist bandwidth of the symbols; transmitting the amplitude modulated optical carrier; receiving the amplitude modulated optical carrier following transmission and performing direct detection of the received amplitude modulated optical carrier to generate a received electrical signal; and determining received symbols from the received electrical signal using an indication of a nonlinear impulse response of the direct detection. - View Dependent Claims (19, 20, 21, 22, 23)
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24. An optical receiver apparatus for an optical transmission system, the optical receiver apparatus comprising:
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a photodiode configured to; receive an amplitude-modulated optical carrier, wherein the amplitude-modulated optical carrier carries a communication signal comprising symbols and has a bandwidth less than a Nyquist bandwidth of the symbols, and perform direct detection of the received amplitude-modulated optical carrier to generate a received electrical signal; and symbol determination apparatus configured to determine received symbols from the received electrical signal using an indication of a nonlinear impulse response of the photodiode. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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31. Optical transmitter apparatus for an optical transmission system, the optical transmitter apparatus comprising:
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an input configured to receive a communication signal comprising symbols for transmission; an electro-optic modulator configured to perform amplitude modulation of an optical carrier with the communication signal to generate an amplitude-modulated optical carrier; and low-pass filtering apparatus configured to perform low-pass filtering to reduce a bandwidth of the amplitude-modulated optical carrier to less than a Nyquist bandwidth of the symbols. - View Dependent Claims (32, 35)
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33. A method of receiving an amplitude modulated optical carrier carrying a communication signal comprising symbols and having a bandwidth less than a Nyquist bandwidth of the symbols, the method comprising:
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performing direct detection of the received amplitude modulated optical carrier to generate a received electrical signal; and determining received symbols from the received electrical signal using an indication of a nonlinear impulse response of the direct detection. - View Dependent Claims (34, 36)
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Specification