CN101666920A

CN101666920A - Optoisolator

Info

Publication number: CN101666920A
Application number: CN200910190358A
Authority: CN
Inventors: 刘伟辉; 岳超瑜; 朱少军
Original assignee: SHENZHEN LIGHTCOMM TECHNOLOGY Co Ltd
Current assignee: SHENZHEN LIGHTCOMM TECHNOLOGY Co Ltd
Priority date: 2009-09-21
Filing date: 2009-09-21
Publication date: 2010-03-10

Abstract

The invention provides an optoisolator which comprises a pair of alignment components and an isolation component arranged between the alignment components, wherein the isolation component comprises afirst analyzer crystal, a half-wave plate, a polarimetric crystal and a second analyzer crystal which are arranged sequentially, the polarimetric crystal is fixed in a permanent magnet, and two sidesof the permanent magnet are provided with at least one reflector plate. The light-passing opening at two sides of the polarimetric crystal is provided with a first reflector plate and a second reflector plate which lead incident light to be transmitted for a plurality of times in the polarimetric crystal, and finally the requirement on a polarimetric angle is achieved by Faraday rotation effect, therefore, the required polarimetric crystal volume and correspond magnet quantity are reduced, thereby decreasing the size of the whole polarimetric crystal and reducing the manufacturing cost.

Description

A kind of optoisolator

Technical field

The present invention relates to field of optical device technology, more particularly, relate to the high-power optoisolator of a kind of short wavelength of being applied to.

Background technology

Optoisolator is one of important optical device of fiber laser and optical communication system, and it has directly determined the quality of the stability of laser system to the isolation size of backlight in the laser system.Along with the develop rapidly of laser technology, on the one hand, the high-power fiber laser of short wavelength is more and more universal in recent years, and has obtained application in a lot of fields; On the other hand, also press for the optical device such as for example optoisolator that can under short wavelength's high power conditions, have superperformance.

Traditional Displacer type (displacement type) optoisolator comprises first, second collimating apparatus, first, second Displacer crystal, and half of wave plate, a faraday rotator and a magnet ring are formed.Forward light is incident on a Displacer crystal from first collimating apparatus and is divided into o light and e light transmission, after passing through half-wave plate and faraday rotator again, be rotated counterclockwise 90 degree, so the conversion of o light and e light takes place, after the synthetic a branch of optically-coupled of the 2nd Displacer crystal enters second collimating apparatus; Backlight is incident on the 2nd Displacer crystal from second collimating apparatus and is divided into o light and e light transmission, behind faraday rotator and half-wave plate, be rotated counterclockwise 0 degree, so the conversion of o light and e light does not take place, after behind the Displacer crystal two-beam all depart from first collimating apparatus and isolated.

The shortcoming of tradition optoisolator is to provide very strong magnetic field in order to satisfy the insulated degree requirement needs.This just requires more magnet and gyrotropi crystal to satisfy faraday rotator 45 degree optically-active needs to form powerful magnetic field, so cause device volume big and with high costs.

Summary of the invention

The technical problem to be solved in the present invention is, at the big and defect of high cost of device volume of the optoisolator of prior art, provides a kind of small size and optoisolator cheaply.

In order to solve the problems of the technologies described above, the invention provides a kind of optoisolator, it comprises: pair of alignment assembly and be arranged at barrier assembly between the described collimator assembly, described barrier assembly comprises first analyzing crystal, half-wave plate, gyrotropi crystal and second analyzing crystal that sets gradually, described gyrotropi crystal is fixed in the permanent magnet, and the both sides of described gyrotropi crystal are provided with at least one reflector plate.

Further, in above-mentioned optoisolator, described reflector plate is arranged at the Tong Guangkou of the both sides of described gyrotropi crystal, makes incident light transmit the back outgoing through at least 3 times in described gyrotropi crystal.

Further, in above-mentioned optoisolator, incident light is through its vibration plane deflection 45 degree behind the described gyrotropi crystal.

Further, in above-mentioned optoisolator, described first analyzing crystal and second analyzing crystal are yttrium vanadate crystal.

Optoisolator of the present invention is provided with first reflector plate and second reflector plate at the logical light mouth of gyrotropi crystal dual-side, incident light is repeatedly transmitted in gyrotropi crystal, and reach the requirement of required optically-active angle by Faraday rotation effect, it has reduced the quantity of required gyrotropi crystal volume and corresponding magnet, thereby has dwindled the size of overall optical isolator and reduced manufacturing cost.

Description of drawings

Fig. 1 is the structural representation of the optoisolator of preferred embodiment of the present invention;

Fig. 2 is the forward light transmission synoptic diagram of the optoisolator of Fig. 1;

Fig. 3 is the backlight transmission synoptic diagram of the optoisolator of Fig. 1.

Embodiment

See also Fig. 1, Fig. 1 is the structural representation of the optoisolator of preferred embodiment of the present invention.

Optoisolator of the present invention comprises first collimator assembly 1, barrier assembly 2 and second collimator assembly 3, and wherein barrier assembly 2 is arranged between first collimator assembly 1 and second collimator assembly 3.

Barrier assembly 2 comprises first analyzing crystal 21 that sets gradually along the light transmission direction, half-wave plate 22, gyrotropi crystal 23, the first reflector plates 24 and second reflector plate, 25, the second analyzing crystals 26.First analyzing crystal 21 and second analyzing crystal 26 are yttrium vanadate crystal (YVO ₄), be used for the light of incident is divided into the effect of o light (ordinary light) and e light (non-ordinary light).

Half-wave plate 22 is a half-wave plate, is used to produce the polarization state that phase delay changes incident polarized light.

Gyrotropi crystal 23 is for producing the TGG monocrystalline of Faraday effect, and it is the best magneto-optic memory technique that is used to make Faraday polarization apparatus and isolator, and applicable wavelengths is 400-1100nm (not comprising 470-500nm).In addition, gyrotropi crystal 23 is fixed in the permanent magnet (figure does not show), is promptly surrounded by magnetic field around it, is used to make the polarization direction of the polarized light that enters gyrotropi crystal 23 to deflect, and promptly produces Faraday rotation effect.

First reflector plate 24 and second reflector plate 25 are arranged at the Tong Guangkou of gyrotropi crystal 23 both sides respectively, are used for changing the direction of incident light in gyrotropi crystal 23 transmission, so that the angle of its polarization deflection or optically-active increases.

See also Fig. 2, Fig. 2 is the forward light transmission synoptic diagram of the optoisolator of Fig. 1.When forward light was incident on first analyzing crystal 21 through first collimator assembly 1, because the birefringence of 21 pairs of light of first analyzing crystal, this forward light is divided into o light in first analyzing crystal 21 and e light transmits.Vibration plane through half-wave plate 22 back o light and e light is rotated counterclockwise 45 degree (in face of the direction of forward light propagation) again, then this o light and e light enter gyrotropi crystal 23 transmission for the first time, enter gyrotropi crystal 23 once more by 24 reflections of first reflector plate after this forward light outgoing, and gyrotropi crystal 23, carry out optic path for the third time from the reflection of second reflector plate 25, the vibration plane of o light and e light is rotated counterclockwise 45 degree (in face of the direction of forward light propagation) once more, so behind half-wave plate 22 and gyrotropi crystal 23, the vibration plane of o light and e light has been rotated counterclockwise 90 degree (in face of the direction of forward light propagation) altogether, thereby the conversion of o light and e light has taken place, after second analyzing crystal, 26 synthetic a branch of light are coupled into the 3 back outgoing of second collimator assembly.

See also Fig. 3, Fig. 3 is the backlight transmission synoptic diagram of the optoisolator of Fig. 1.When backlight is incident on second analyzing crystal 26 through second collimator assembly 3, this backlight is injected gyrotropi crystal 23 be divided into o light and e light in second analyzing crystal 26 after, because the effect of first reflector plate 24 and second reflector plate 25, described o light and e light in gyrotropi crystal 23 through three transmission, this moment its vibration plane 45 degree (direction of propagating in face of backlight) that turn clockwise; Following described o light and e light injects through half-wave plate 22 and incides in first analyzing crystal 21, its vibration plane will be rotated counterclockwise 45 degree (in face of the direction of backpropagation) this moment, the vibration plane of o light and e light has rotated 0 degree altogether, the conversion of o light and e light does not take place, so o light and e light will all depart from 1 outgoing of first collimator assembly through first analyzing crystal, 21 back two-beams, thereby play the effect that backlight is isolated.

Be appreciated that first analyzing crystal 21 and second analyzing crystal 26 can also be wedge among the present invention; The quantity of reflector plate can also be made as other numbers, gets final product with vibration plane deflection 45 degree of realization with incident light.

Than prior art, the present invention is provided with first reflector plate 24 and second reflector plate 25 at the logical light mouth of gyrotropi crystal 23 dual-sides, incident light is repeatedly transmitted in gyrotropi crystal 23, and reach the requirements of 45 degree optically-active angles by Faraday rotation effect, it has reduced the quantity of required gyrotropi crystal volume and corresponding magnet, thereby has dwindled the size of overall optical isolator and reduced manufacturing cost.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.

Claims

1, a kind of optoisolator, it is characterized in that, comprise the pair of alignment assembly and be arranged at barrier assembly between the described collimator assembly, described barrier assembly comprises first analyzing crystal, half-wave plate, gyrotropi crystal and second analyzing crystal that sets gradually, described gyrotropi crystal is fixed in the permanent magnet, and the both sides of described gyrotropi crystal are provided with at least one reflector plate.

2, optoisolator according to claim 1 is characterized in that, described reflector plate is arranged at the Tong Guangkou of the both sides of described gyrotropi crystal, makes incident light transmit the back outgoing through at least 3 times in described gyrotropi crystal.

3, optoisolator according to claim 2 is characterized in that, incident light is through its vibration plane deflection 45 degree behind the described gyrotropi crystal.

4, optoisolator according to claim 1 is characterized in that, described first analyzing crystal and second analyzing crystal are yttrium vanadate crystal.