Heterodyne detection device based on light injection locking and light phase-locked loop

A technology of heterodyne detection and injection locking, which is used in automatic power control, electrical components, electromagnetic receivers, etc., and can solve problems such as large power consumption, large frequency offset of optical coherent receivers, and large phase noise.

Active Publication Date: 2019-12-03
SHANGHAI UNIV
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Problems solved by technology

[0007] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the existing optical coherent receivers have large frequency offset, large phase noise, large power consumption, high software compl

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  • Heterodyne detection device based on light injection locking and light phase-locked loop
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  • Heterodyne detection device based on light injection locking and light phase-locked loop

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Embodiment Construction

[0036] First, through the optical injection locking process of the laser, the laser at the transmitting end is injected into the local (LO) laser at the receiving end. Realize the synchronization of light waves at the sending and receiving ends, and the frequency is exactly the same. The sending office uses two wavelengths of light waves for each user end, one carries the downlink signal, and the other injects into the local laser of the coherent receiver of the user end to realize the heterodyne detection of the downlink signal light wave, and at the same time as the light source of the uplink signal, carrying up signal. The two wavelengths are provided by a multi-wavelength optical comb generator (Optical Comb Generator) composed of a narrow linewidth laser and a lithium niobate optical modulator (MZM), and the remaining wavelengths are provided to other user terminals. Injection locking is achieved through a polarization-maintaining circulator connected to a controlled las...

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Abstract

The invention provides a heterodyne detection device based on light injection locking and a light phase-locked loop, which comprises a polarization tracking section, a heterodyne detection section anda down-conversion section, and is characterized in that the heterodyne detection section comprises an injection locking section, a coherent detection section and a light phase-locked feedback loop; the injection locking section comprises a first polarization-maintaining optical branching device, an optical phase shifter, a polarization-maintaining circulator, a local laser and a second polarization-maintaining optical branching device; the coherent detection section comprises a polarization-maintaining 2 * 2 3dB coupler, a balance light detector pair, a low-noise trans-impedance amplifier anda first power divider; the optical phase-locked feedback loop comprises a first amplifier and a loop filter; the down-conversion section comprises an ultra-narrow band-pass filter, a second amplifier, a second power divider, a phase shifter, a pi/2 power divider, a third amplifier, a third power divider, a first mixer, a second mixer, a first low-pass filter and a second low-pass filter. Heterodyne detection is adopted, frequency synchronization of LO light waves and main control light waves is achieved, the receiver achieves zero frequency deviation, phase noise is small, and output signalsare stable.

Description

technical field [0001] The invention relates to the field of optical receivers, in particular to a heterodyne detection device based on optical injection locking and an optical phase-locked loop. Background technique [0002] The optical detection technology applied in the existing optical access network is direct detection (envelope detection). The idea of ​​optical coherent detection technology originated from the radio heterodyne detection technology. With the help of the multiplication effect of the strong power of the local oscillator, even if the external signal is very weak, a sufficiently large output signal can still be generated in the detection circuit, thereby achieving high receiver sensitivity. Utilizing the tuning of the local oscillation frequency, the user can choose to receive the information he needs among various signals and many channels. Therefore, high receiving sensitivity and strong frequency selectivity are the fundamental advantages of coherent d...

Claims

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Application Information

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IPC IPC(8): H03L7/081H03L7/093H04B10/64
CPCH03L7/081H03L7/093H04B10/64
Inventor 林如俭宋英雄李正璇李迎春梁凌寰
Owner SHANGHAI UNIV
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