A low-noise radio frequency optical transmission module capable of wide temperature operation

Abstract

The invention relates to a low-noise radio-frequency optical transmission module capable of working in a wide temperature range. The low-noise radio-frequency optical transmission module is composed of a laser, a front optical fibre coupler, a rear optical fibre coupler, a Mach-Zehnder modulator, a temperature control module and a pilot frequency-less power bias control module, wherein the temperature control module is composed of a TEC and a simulation PID circuit; the pilot frequency-less power bias control module obtains the ratio of input and output optical power of the Mach-Zehnder modulator through a photoelectric detector; furthermore, the radio is used as a control error signal; optical power disturbance influence of the laser itself can be eliminated; steady-state error elimination can be carried out through an integral control loop; adjustment and control voltage is additionally increased on the optical power ratio voltage by utilization of an addition circuit; the adjustment and control voltage is changed; and stabilization of a large-range any working point of an electrooptical modulator can be realized. According to the low-noise radio-frequency optical transmission module disclosed by the invention, due to introduction of the temperature control temperature, temperature compensation on the optical fibre coupler is realized; change of optical power of a coupling arm due to the temperature is reduced; and the radio-frequency optical modulation performance is improved.

Description

technical field [0001] The invention relates to a low-noise radio frequency optical transmission module capable of working at a wide temperature, which is suitable for radio frequency laser transmission in a wide temperature working environment and belongs to the field of optical fiber communication. Background technique [0002] Externally modulated radio frequency optical transmission technology has the advantages of low loss, light weight, low power consumption, anti-electromagnetic interference, etc. It is widely used in radar, satellite communication, measurement and detection systems and other fields. [0003] The RF optical transmission module generally includes a laser, a Mach-Zehnder modulator, a fiber coupler, and a bias control module. The control scheme of the RF optical transmission module is usually to add a low-frequency perturbation signal to the DC voltage bias end of the Mach-Zehnder modulator, and to automatically control the Mach Zender modulator bias po...

AI Technical Summary

Problems solved by technology

Although it is a perturbation signal, it is actually a stable operating point. The amplitude of the dithering signal required in the linear region is usually about 10 times the amplitude of the signal required in the extreme point. Therefore, a large noise is introduced, which is harmful to radio frequency optical transmission. (ROF) system transmission signal has a certain influence

There is also a bias control scheme that uses power detection. Since it does not need to load a disturbance signal, it has a great advantage in improving signal quality. However, due to the influence of the power fluctuation of the laser itself, the stability of the scheme that only monitors the output optical power of the modulator is not high. , and the ambient temperature will affect the optical path loss, and the position of the working point is related to the optical path loss, resulting in low positioning accuracy

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