Multipurpose full gloss optical reshaper based on Sagnarc ring

Abstract

The invention is a kind of all otpical form dresser based on the saganuke ring, which includes an input end, an output end, a fiber coupler, and a fiber ring. The character lies in: there sets the first variable refractive index lenticule, a polarizing disc, the second variable refractive index lenticule and the Faraday polarization apparatus, and fiber coupler on the input end of the signal beam path; there also sets a control beam path, on which there sets a delay device, variable rejector, convex lens, a fiber segment, a three-circle polarization controller, the first WDM coupler and the second WDM coupler. One end of the fiber segment is at the focus of the convex lends, another end of the fiber segment is connected to the fiber ring through the first WDM coupler, there sets the second WMD coupler on the fiber ring with interval L to the first WDM coupler, and the L is little than the semicircle of the fiber ring, the three-circle polarization controller is set on the fiber segment.

Description

technical field [0001] The invention relates to an optical shaper, in particular to a multi-purpose plenoptic optical shaper based on a Sagnac ring. Background technique [0002] The traditional Sagnac optical switch is also called nonlinear optical loop mirror or fiber optic loop mirror, which utilizes the optical Kerr effect. In the prior art, it was published in the 25th issue of Electronics Letters in 1989 by N.J.DORAN et al. of the British Telecom Research Laboratory, on pages 267-269, the Sagnac optical switch structure is as follows figure 1 shown. It consists of a fiber coupler 3 and a fiber ring 4. It uses a piece of optical fiber to connect the two output ports 1 and 2 of the fiber coupler 3 to form a ring. Port 1 is the input port and the reflected light output port, and port 2 is the transmission port. light exit end. The input power from the input terminal 1 of the Sagnac optical switch is P 0 After the signal light passes through the coupler 3, the signal l...

AI Technical Summary

Problems solved by technology

[0006] 1. This Sagnac optical switch controls the optical switch by relying on the non-linear phase difference generated by the self-phase modulation (SPM) effect of the two beams of signal light transmitted in reverse, which requires the power of the signal light to be so high that it produces Non-linear effect, which limits the application of this optical switch in low power conditions

[0007] 2. Due to the power p of the signal light pulse 0 It is determined by the time waveform. From equation (1), it can be seen that the transmittance and reflectance of this optical switch are related to the time waveform of the optical pulse, that is to say, the transmittance and reflectance of the optical pulse are different at different times. In this way, this kind of optical switch cannot be fully opened and closed in theory, and such an optical switch cannot have a high extinction ratio

Therefore, the traditional Sagnac optical switch will cause significant distortion of the signal pulse, and the transmitted light and reflected light cannot be a copy of the original signal light.

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