Low-voltage transmission-type pulse width-adjustable optical-fiber online electro-optical Q switch

Abstract

The invention provides a low-voltage transmission-type pulse width-adjustable optical-fiber online electro-optical Q switch which is composed through in-series connection of two low-voltage voltage-reduction transmission-type optical-fiber online electro-optical Q switch optical modules, wherein the two modules are driven by a voltage-reduction power source and a voltage-boosting power source respectively; the two power sources are controlled by a delay control circuit; and voltages and signals output by the two power sources have the same frequency and pulse width, but signal time is delayed, and the delay time is continuously adjustable within a pulse width scope. Switching time is very short, the typical value is 5-10 ns, the defect that a common power source cannot be switched off completely is overcome, an extinction ratio of the switch is increased, the overall pulse width is continuously adjustable in the very wide scope, and an application scope of the product is increased; because of the design, a working voltage of an electro-optical crystal is greatly reduced, reliability of the product is enhanced, and the cost is reduced; the optical-fiber-based electro-optical Q switch has a higher integration degree and can be used more conveniently; and the switch is highly superior in structure and performance.

Description

technical field [0001] The invention relates to the fields of optical fiber sensing, optical fiber communication, laser processing, medical treatment, military affairs, and scientific research, in particular to a low-voltage transmission type pulse width adjustable optical fiber online electro-optical Q-switching switch as a core device of an optical fiber laser. Background technique [0002] In the fields of modern optical fiber sensing, optical fiber communication, laser processing, medical treatment, military affairs, scientific research, etc., the low-voltage transmission type pulse width adjustable optical fiber online electro-optical Q-switching switch is a key component. Electro-optic Q-switching uses the electro-optic effect of the crystal to change the polarization state of the incident light when a first-order transition voltage is applied to adjust the loss of the laser resonator and control the accumulation and release of light energy. The general output of conti...

AI Technical Summary

Problems solved by technology

However, the current conventional electro-optical Q-switching switch is large in size, low in frequency, and has a relatively high half-wave voltage. It needs several thousand volts of high-voltage pulse drive, which is easy to cause interference to other electronic circuits.

In addition, a single electro-optic switch is not easy to turn off, and the power switch time is asymmetrical. The short turn-on time means the long turn-off time.

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