Spectroscopic device, wavelength selective switch, and spectroscopic method

Abstract

The embodiments of the invention provide a spectroscopic device, a wavelength selective switch, and a spectroscopic method. The spectroscopic device comprises gratings and reflective element sets. Thefirst region of the grating is located on the path of the incident optical path, the second region of the grating is located on the path of the emergent optical path, and the reflective element setsare located on the path of the diffracted optical path. The diffracted optical path is an optical path where a plurality of diffracted spectral beams are located, which are formed by a composite beambeing diffracted by the grating after being incident through the incident optical path are located. Each of the reflective elements of the reflective element set maintains a predetermined angle with the grating such that the plurality of diffracted spectral beams are reflected by the reflective element set to the second region of the grating, and then emitted from the emergent optical path after being diffracted. The spectroscopic device re-reflects the diffracted spectral beams onto the grating through the reflective element set, thereby realizing the re-diffraction of the diffracted spectralbeams by the grating to increase the scattering angle between the spectral beams. The spectroscopic device can greatly improve the light splitting capability, and has a simple structure and manufacturing process and low cost.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of optical communication, and more specifically, to a light splitting device, a wavelength selective switch, and a light splitting method. Background technique [0002] The spectroscopic device is a device that uses the phenomenon of dispersion to disperse the composite light into multiple monochromatic lights according to the wavelength. At present, the main device in the spectroscopic device is a grating. For the purpose, the light splitting device can be applied to the wavelength selective switch. [0003] For the wavelength selective switch, in order to obtain a better bandwidth index, the light splitting device in the wavelength selective switch is required to have a strong light splitting ability. The current light splitting device mainly uses the following methods to improve the light splitting ability: (1) by improving the grating The number of reticles is used to improve the l...

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Problems solved by technology

[0004] The above-mentioned method of improving the light-splitting ability of the spectroscopic device by increasing the number of lines of the grating has high requirements for the manufacturing process of the grating, and the cost is high; by using the combination of the grating and the prism, the combination process of the grating and the prism has Higher requirements, the production process is more complicated

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