Device and method for expanding spectral widths

Abstract

The invention provides a device and a method for expanding spectral widths. The device for expanding the spectral widths comprises a spectroscope, a first plane mirror, a second plane mirror and a focusing lens. The spectroscope is used for respectively carrying out reflex and transmission on laser pulses coming from an incidence end in an incident mode. The first plane mirror is used for carrying out reflex on a laser pulse which is reflected by the spectroscope. The second plane mirror is used for carrying out reflex on a laser pulse which is transmitted by the spectroscope. The distance between the first plane mirror and the spectroscope is unequal to the distance between the second plane mirror and the spectroscope. The spectroscope is further used for transmitting the laser pulse which is reflected by the first plane mirror to the focusing lens, and for reflecting the laser pulse which is reflected by the second plane mirror to the focusing lens. The focusing lens is used for outputting the two incident laser pulses to an optical fiber through an outgoing port. Through controlling on the sequence by which the two laser pulses enter the optical fiber, strong orphans of the two laser pulses are crashed in the optical fiber, and the spectral widths of the output laser pulses are expended.

Description

technical field [0001] Embodiments of the present invention relate to optical communication technologies, and in particular, to a device and method for extending spectral width. Background technique [0002] Super-continuum (SC) means that after the laser passes through a nonlinear material, more new frequency components are generated in the spectrum of the outgoing laser, so that the spectral width of the outgoing laser is much larger than the spectral width of the incident laser. Generally, it can reach hundreds of nanometers or even thousands of nanometers. The supercontinuum generated by using photonic crystal fibers (Photonic Crystal Fibers, PCF) has the characteristics of high output power, relatively flat broadband spectrum, and good spatial coherence. [0003] Using the supercontinuum as a light source has been used in many fields such as spectroscopic analysis, microscope imaging and optical coherence tomography. In terms of optical communication, the supercontinu...

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Problems solved by technology

[0005] However, since the spectral width of the supercontinuum is determined by the pulse peak power value of the laser pulse, and the pulse peak power value of the laser pulse needs to be set within the working range, it is impossible to increase it infinitely. Therefore, the prior art The method of extending the spectral width of the supercontinuum in the medium has limitations in the expansion effect on the spectral width

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