Integrated structure of coherent channelized receiver

Abstract

The invention discloses an integrated structure of a coherent channelized receiver. The integrated structure comprises a laser generation module, a first optical frequency comb generation module, a second optical frequency comb generation module, a suppression carrier single sideband modulation module, an I/Q optical mixing module, two parallel optical filter modules and a plurality of I/Q electric coupling modules. According to the invention, the microwave photon technology is utilized, and compared with the traditional channelization equipment utilizing electric signal processing, the structure can reduce the radio frequency interference; by utilizing a single sideband modulation mode of inhibiting carrier waves, the processable bandwidth is improved, symmetrical mirror image componentsgenerated by interaction of signals and original carrier waves are prevented from being generated, the requirement on an optical band-pass filter is reduced, the integration of an optical filter is facilitated, and meanwhile, the signal to noise ratio of output signals is improved. According to the invention, the structure of the carrier suppression single-sideband modulator is optimized, the sizeis reduced, and the precision is improved; through the integration of the main body optical path, the volume of the receiver is reduced, and the practicability and reliability of the channelized receiver are improved.

Description

technical field [0001] The invention belongs to the field of optical communication, and in particular relates to an integrated structure of a coherent channelized receiver. Background technique [0002] With the increasing bandwidth of received signals in modern radio frequency systems, receivers with wideband radio frequency signal processing capabilities are urgently needed. However, the large bandwidth is difficult for traditional devices to handle, so channelization is one of the most effective ways to achieve this requirement, which divides the received wideband RF signal into multiple narrowband channels, and then processes the narrowband channels in parallel. [0003] Due to the advantages of broadband, low loss and anti-electromagnetic interference, microwave photonic signal processing has received extensive attention in the past 20 years. Complete signal processing, because the optical frequency is extremely high, the signal bandwidth that can be processed is also ...

AI Technical Summary

Problems solved by technology

However, the channelization scheme of the traditional optical frequency comb requires many discrete components and is expensive, which makes the reliability worse and the maintenance becomes difficult.

At the same time, the bandwidth that can be achieved by the channelization scheme of the traditional optical frequency comb is less than half of the frequency of the input RF source compared to the frequency interval of the comb teeth of the optical frequency comb, which limits the further development of channelization

At the same time, the carrier of the optical frequency comb also has an impact on the quality of the final output signal. If the carrier with higher power is retained, in the high-frequency sub-channel, a symmetrical image component that is almost the same as the power of the original signal will eventually be generated. However, if filtering is used to Filtering out the carrier, because the filter itself is not an ideal device, will further reduce the bandwidth that can be processed. At the same time, it is difficult to align the transition band of the filter, which virtually increases the difficulty of production.

[0006] The above-mentioned problems can be avoided by using carrier-suppressed single-sideband modulation, but the generally used dual-parallel Mach-Zehnder modulator (DPMZM) is relatively complicated, and the size of the added DC bias needs to be measured in advance in the chip test stage, which is relatively difficult to apply. Trouble, at the same time, the lithium niobate crystal in the Mach-Zehnder modulator is relatively large, which is not conducive to integration

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