Optical grating rotary light splitting device and method for optical wedge delay polarization elimination

Abstract

The invention provides an optical grating rotary light splitting device and method for optical wedge delay polarization elimination. The device comprises emergent light, incident light, an optical wedge delay board, a parabolic reflector, a rotary diffraction grating, a reflecting and focusing system and a data detection system. The optical wedge delay board is used for eliminating polarization sensitivity. The parabolic reflector is used for aligning and focusing light. The rotary diffraction grating is used for conducting chromatic dispersion light splitting on the incident light. The optical grating rotary dual-flux light splitting technology and the optical wedge delay polarization suppression technology under the quasi-Littrow condition are adopted, polarization sensitivity can be eliminated on the premise that small optical flux is lost, the flexibility of a level is effectively improved, a light splitting system and the data detection system at the rear end can be greatly simplified, the size of a spectrograph is reduced, and production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of grating rotating spectroscopic separation, and in particular relates to a grating rotating spectroscopic device and method for optical wedge delay and depolarization. Background technique [0002] At present, due to the advantages of large transmission capacity, high transmission rate, anti-electromagnetic interference, and strong confidentiality, optical fiber communication technology has been rapidly developed and widely used in various fields such as military, industry, agriculture, medical care, and scientific research. The continuous improvement of the transmission rate and transmission accuracy of the optical fiber communication system is particularly important for the test of the optical fiber communication system, and the relevant test instruments play an important role of "seemingly supporting role, but actually the key". Whether it is an optical fiber communication system development unit or an ...

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Problems solved by technology

[0004] The above method can effectively reduce the polarization sensitivity of the spectroscopic system to a certain extent, but it has the following disadvantages: (1) After passing through the polarization beam splitter and a series of reflection and collimating mirrors, the loss of luminous flux is relatively large, which will give the back-end photoelectric detection and signal The processing increases the difficulty; (2) Due to the use of four sets of photoelectric detection systems, the structure is complex, the volume is large, and the cost is high; (3) If the diffraction loss of light with different polarization directions is very different, the signal-to-noise ratio of the system will deteriorate and the sensitivity will be low

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