Photonic vector signal generation using heterodyne beating
AssigneeZte Corporation
InventorsJianjun Yu, Xinying Li
Life of this patent
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Abstract
An exemplary technique of optical signal transmission in which modulated optical signals are generated using photonic heterodyne beating and operating a digital to analog converter at baseband includes receiving information bits, modulating the information bits to generate a precoded vector signal at baseband, generating, using photonic heterodyne beating, from the precoded vector signal at baseband, a precoded vector signal at an upconverted frequency, and transmitting the precoded vector signal at the upconverted frequency on the optical communication network.
Claims28
A method of optical communication, implemented at a transmitter in an optical communication network, comprising:
- receiving information bits;
- modulating, using in-phase and quadrature modulation, the information bits to generate a precoded vector signal at baseband;
- generating, using photonic heterodyne beating, from the precoded vector signal at baseband, a precoded vector signal at an upconverted frequency, wherein the photonic heterodyne beating includes:
- modulating a first optical carrier signal using the precoded vector signal at baseband to generate a carrier-modulated precoded vector signal,
- combining, in an optical domain, the carrier modulated precoded vector signal with a second optical carrier signal, wherein the first optical carrier signal and the second optical carrier signal have different frequencies, and
- passing a resulting signal of the combining through a photo-detector to generate the precoded vector signal at the upconverted frequency;
- and
- transmitting an optical transmission signal, generated from the precoded vector signal at the upconverted frequency, on the optical communication network.
An optical transmitter apparatus, comprising:
- a data interface that receives information bits;
- an I/Q modulator that modulates the information bits to generate a precoded vector signal at baseband;
- a photonic heterodyne beating subsystem that generates, using photonic heterodyne beating, from the precoded vector signal at baseband, a precoded vector signal at an upconverted frequency, wherein the photonic heterodyne beating subsystem includes:
- a first source of a first optical carrier signal is coupled to the I/Q modulator such that the I/Q modulator modulates first optical carrier signal using the precoded vector signal at baseband to generate a carrier-modulated precoded vector signal,
- a second source of a second optical carrier signal is coupled to an optical combiner, wherein the first optical carrier signal and the second optical carrier signal have different frequencies,
- the optical combiner having two inputs of which a first input is coupled to an output of the I/Q modulator and the second input is coupled to the second source of the second optical carrier signal, thereby combining, in an optical domain, the carrier modulated precoded vector signal with a second optical carrier signal,
- a photo-detector coupled to an output of the optical combiner to generate the precoded vector signal at the upconverted frequency;
- and
- an optical transmitter that transmits an optical signal generated from the precoded vector signal at the upconverted frequency on an optical transmission medium.
Dependencies are inferred from the claim text.