Method for simultaneously realizing linear optimization and power periodic fading compensation in analog photon down-conversion link

Abstract

The invention discloses a method for simultaneously realizing linear optimization and power periodic fading compensation in an analog photon down-conversion link. As shown in a figure 1 in the specification, a device comprises a laser device (LD), a polarization modulator PolM, a single-mode fiber (SMF), a polarization controller (PC), a Sagnac ring, an erbium-doped fiber amplifier (EDFA), a polarizer and a photoelectric detector (PD). A radio frequency signal is modulated to an optical carrier through a PolM, odd and even order sidebands of a modulated signal in an orthogonal polarization state are separated through a polarization controller and a polarization beam splitter (PBS) in a Sagnac ring, and a phase modulator (PM) is bidirectionally used in the Sagnac ring to enable one polarization state in the clockwise direction to be modulated by an LO signal. Appropriate phase shift is introduced between two orthogonal polarization directions of a down-conversion signal, so power fading caused by dispersion can be compensated after photoelectric conversion, third-order intermodulation distortion is eliminated, and linear optimization is realized. The device is simple and compact in structure, flexible in tuning, large in working bandwidth and high in system reconfigurability.

Description

technical field [0001] The invention relates to the technical field of optical communication and microwave technology, and mainly relates to the linear optimization and periodic power fading compensation of an analog photon down-conversion link. Background technique [0002] Microwave photonics is a new discipline that combines microwave radio frequency technology with photonics technology. It completes the processing of electrical signals in the optical domain, including signal generation, transmission, frequency mixing, and filtering. Microwave photonic links have the advantages of large communication capacity, small transmission loss, small size, light weight, and anti-electromagnetic interference. They have broad application prospects in satellite communications, radar, electronic warfare, and cable television. Microwave photonic frequency conversion technology is widely used in various fields of modern society. Traditional microwave down conversion technology faces elec...

AI Technical Summary

Problems solved by technology

However, fiber chromatic dispersion will cause different time delays for signals of different frequencies, that is to say, different frequency components in the PD received signal will show different phase shifts

At this time, the transmission performance of the link will be affected by the dispersion of the fiber, causing the power of the transmission signal to decline periodically with the frequency and transmission distance of the transmission signal, making it impossible for the receiving end to extract useful signals, which has a great impact on the communication quality

Images