System and method form monitoring side-mode suppression ratio and channel stability of tunable laser

Abstract

The invention discloses a system and a method for monitoring side-mode suppression ratio and channel stability of a tunable laser and relates to the device and the method for monitoring the dominant frequency and side-mode power of the laser through a sampling etalon to judge spectral quality and channel stability of the laser so as to carry out effective control. The monitoring system disclosed by the invention mainly comprises the tunable laser composed of a gain medium, a coupling optical part, a fixed lattice filter, a tunable filter and a reflective optical part, a beam collimation lens, an opto-isolator, a beam splitter component, an F-P (fabry-Perot) etalon, an optical detector, a coupling output lens, a controller, etc. Through a plurality filters outside a laser cavity and a photoelectric detection structure, wavelength lock is carried out; the spectral quality is evaluated; the tunable filter is timely adjusted and controlled; the lasing wavelength is stabilized in the required channel all the time, and good enough spectral quality is achieved. The monitoring system is suitable for online spectral quality monitoring in work of the laser and possible drift correction resulting from switching of the filter inside the cavity.

Description

technical field [0001] The invention relates to a multi-channel adjustable laser characteristic monitoring system and a monitoring method. In particular, it relates to an adjustable laser side mode suppression ratio and channel stability monitoring system and monitoring method. Background technique [0002] Tunable lasers are one of the key devices in optical communication networks. The advanced modulation and demodulation methods used in the new generation of optical networks, especially the phase modulation coherent demodulation methods, have a great impact on the low phase noise characteristics of tunable lasers, that is, the narrow linewidth characteristics. In response to this development trend, in recent years, various new narrow-linewidth tunable laser solutions are emerging, and some have gradually entered the practical field. [0003] Numerous technical solutions include tandem integration with semiconductor grating selection, laser array integration, micro-resonan...

AI Technical Summary

Problems solved by technology

[0004] However, external cavity tunable lasers also have an obvious disadvantage, that is, they are prone to mode hopping under the influence of various factors, which will lead to the degradation of laser characteristics. Suppressing mode hopping is a must be solved in the practical process of external cavity tunable lasers complex technology

Images