wavelength locking device

Abstract

The invention provides a wavelength locking device which is applied to the wavelength locking of tunable lasers. The wavelength locking device comprises a second beam splitter, a wavelength etalon, a first photodiode array and a second photodiode array, wherein laser light emitted from a laser enters the second beam splitter and then is split into two beams of light by the second beam splitter, one light beam is refracted to a photodetector of the first photodiode array and has the light power of Pa; the other light beam enters the wavelength etalon, then, enters a photodetector of the second photodiode array and has the light power of Pb, the laser is controlled according to Pb / Pa ratio feedback, and the wavelength of light emitted from the laser is locked. According to the wavelength locking device, only one set of wavelength locking device is designed, and the simultaneous locking of dual wavelengths is realized by the wavelength locking device, so that the number of separating components in a package and the process complexity are greatly reduced, and meanwhile, the space of the package, the size of a product and the cost are greatly reduced.

Description

technical field [0001] The invention belongs to a tunable laser in the field of optical communication, and in particular relates to a wavelength locking device. Background technique [0002] Tunable lasers are widely used in optical fiber communication and optical fiber sensors and other systems. Wavelength tunable lasers can greatly reduce the huge pressure on light source configuration, backup and maintenance of dense wavelength division multiplexing systems, and improve the cost performance of optical fiber networks. It is a current research hotspot. . A variety of wavelength tunable lasers have been developed, such as distributed feedback (DFB) lasers, external cavity lasers (ECL), microelectromechanical systems (MEMS) switching lasers, etc. [0003] Coherent optical transmission systems use modulation formats with higher spectral efficiency, thereby providing higher single-channel rates and communication capacity. The coherent detection optical receiver has the advant...

AI Technical Summary

Problems solved by technology

[0005] For wavelength locking devices with multiple wavelengths, the usual practice is to separate the beams of the two wavelengths through a filter beam splitter, and configure a set of locking components respectively, which will greatly increase the number of discrete components packaged, and the structure is complex and costly. , and the assembly process of multiple discrete components is extremely complex, especially when in-line active coupling becomes necessary

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