Pulse phase stabilization method and device

Abstract

The invention relates to a pulse phase stabilization method and a device. The method comprises the following steps: S1, obtaining continuous light as signal light; S2, carrying out polarization state modulation and power control on the signal light and pulse light to be processed and inputting the signal light and the pulse light into respective and optical fiber to carry out cross polarization modulation; S3, filtering the output light after being subjected to the cross polarization modulation to filter the pulse light; S4, carrying out polarization state adjustment and intensity conversion to the filtered signal light to obtain a wavelength conversion light signal, thereby outputting a pulse signal. By adopting the technical scheme, the cross polarization modulation effect and the wavelength conversion principle are utilized for completely removing the phase information of the original pulse, so that the phase consistence of output pulses is ensured, thereby greatly improving the performance of the whole system. Meanwhile, a high nonlinear light crystal is utilized as a cross polarization modulation medium to meet the phase modulation requirements of an ultra-short pulse laser.

Description

technical field [0001] The invention relates to the technical fields of optoelectronics and optical fiber communication, in particular to a method and device for stabilizing the output pulse phase of an optical fiber mode-locked laser based on the principle of cross polarization modulation. Background technique [0002] In the optical fiber communication system, time-division multiplexing can be used for communication to improve the bandwidth utilization of communication lines. However, time division multiplexing needs to distinguish information of different users in the time domain. To achieve high speed, such as communication greater than 10Gb / s, each bit period cannot be greater than 100ps. If higher-speed communication is to be achieved, or the possible interference between different user bits is considered, the width of each optical pulse carrying information should be much smaller than 100 ps. Therefore, ultrashort optical pulses with a pulse width less than 5 ps are ...

AI Technical Summary

Problems solved by technology

However, since the phase between different pulses will be very sensitive to changes due to external disturbances such as environment, temperature, and jitter, fiber mode-locked lasers cannot guarantee the consistency of pulse phase stability

In addition, since the demodulation of the DQPSK system requires the use of self-coherence technology, that is, the interference effect of two adjacent pulses, to achieve signal reception, if the pulse phase output by the fiber mode-locked laser is unstable, a stable interference signal cannot be obtained. Seriously affect system performance

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