CN214310984U

CN214310984U - Miniature polarization-maintaining delay line based on piezoelectric ceramics

Info

Publication number: CN214310984U
Application number: CN202022858825.0U
Authority: CN
Inventors: 程义
Original assignee: ADVANCED FIBER RESOURCES (ZHUHAI) Ltd
Current assignee: ADVANCED FIBER RESOURCES (ZHUHAI) Ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-09-28
Anticipated expiration: 2030-12-02

Abstract

The utility model provides a piezoelectric ceramic-based miniature polarization-maintaining delay line, which comprises a double-fiber polarization-maintaining collimator, a PBC polarization beam combining prism, an 1/4 wave plate and a reflector which are arranged along the direction of a light path; the micro optical delay line also comprises piezoelectric ceramics, the telescopic end part of the piezoelectric ceramics in the light path direction is connected with the reflector, and the piezoelectric ceramics drives the reflector to move along the light path direction. The polarized light path is optimized through the scheme, the size of an optical element is reduced, the processing difficulty of a crystal is reduced, the cost of a device is reduced, the processing precision can reach the level of mum, the repetition frequency can reach the level of kHZ, and the high-speed high-precision adjustment of the optical path can be realized by utilizing the precise adjustment of the piezoelectric ceramic.

Description

Miniature polarization-maintaining delay line based on piezoelectric ceramics

Technical Field

The utility model relates to an optical device field especially relates to a miniature polarization-maintaining delay line based on piezoceramics.

Background

In present day optical fiber communication systems, an optical delay line device is an important component. They are key elements in the exchange of optical signal streams from one path to another. They are used for packet switching for internet applications and as a basic component in the associated filters for identifying internet packet addresses. An optical delay line device is also used in the buffer that controls the signal routing timing. They are also used to synchronize data bits, compensate for chromatic dispersion between different optical paths, and compensate for differential delays between paths.

The existing optical delay line generally comprises a pyramid prism and two optical fiber collimators which enter and exit, a certain distance is required in the traditional two collimator schemes, and the pyramid prism is large in size, so that the whole size is large. And the upper sliding block, the guide rail, the screw rod, the coupler and the stepping motor are matched, so that the volume of the whole optical delay line is larger.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a miniature polarization-maintaining delay line that optical distance was adjusted carries out based on piezoceramics.

In order to realize the purpose of the utility model, the utility model provides a micro polarization-maintaining delay line based on piezoelectric ceramics, which comprises a double-fiber polarization-maintaining collimator, a PBC polarization beam-combining prism, an 1/4 wave plate and a reflector which are arranged along the light path direction; the miniature polarization-maintaining delay line further comprises piezoelectric ceramics, the telescopic end part of the piezoelectric ceramics in the light path direction is connected with the reflector, and the piezoelectric ceramics drives the reflector to move along the light path direction.

In a further scheme, the 1/4 wave plate is attached to the end face, facing the reflecting mirror, of the PBC polarization beam combining prism.

In a further scheme, the 1/4 wave plate is attached to the end face, facing to the PBC polarization beam combining prism, of the reflecting mirror.

The beneficial effects of the utility model are that, with driven motor, shaft coupling and lead screw replacement carry out the optical distance and adjust for piezoceramics, and replace two single fiber collimators with two fine polarization collimators of guarantor, the purpose of reducing the size and reducing the part has been reached, and update the pyramid prism of large size for the less polarization beam combining prism of size, 1/4 wave plate's combination, and still can optimize the polarization light path of product, optical element's size has been reduced, and the processing degree of difficulty of crystal has been reduced, the cost of device has been reduced, and the machining precision can reach the mu m level, repetition frequency can reach the kHZ level, and the high-speed high accuracy that can realize the optical distance is adjusted to the accurate regulation that utilizes piezoceramics.

Drawings

Fig. 1 is a schematic view of a light path of a first embodiment of the miniature polarization-maintaining delay line of the present invention.

Fig. 2 is a schematic light path diagram of a second embodiment of the polarization-maintaining delay line of the present invention.

The present invention will be further explained with reference to the drawings and examples.

Detailed Description

First embodiment of the miniature polarization-maintaining delay line:

the miniature polarization-maintaining delay line comprises a double-fiber polarization-maintaining collimator 11, a PBC polarization beam combining prism 12, a 1/4 wave plate 13 and a reflecting mirror 14 which are arranged along the direction of an optical path, wherein the double-fiber polarization-maintaining collimator 11 is provided with a first polarization fiber 111 and a second polarization fiber 112 which are symmetrically arranged. The PBC polarization beam combining prism 12 has a polarization splitting slope, and the 1/4 wave plate 13 is attached to an end surface of the PBC polarization beam combining prism 12 facing the reflecting mirror 14.

The micro optical delay line further comprises piezoelectric ceramics 15, the telescopic end portion of the piezoelectric ceramics 15 in the optical path direction is connected with the reflecting mirror 14, and the piezoelectric ceramics 15 drives the reflecting mirror 14 to move along the optical path direction.

After being output by the lens 113 of the dual-fiber polarization-maintaining collimator 11, the polarized light input from the slow axis of the first polarization fiber 111 enters the PBC polarization beam combining prism 12 in a manner of inclining to the optical path direction, then the polarization state is deflected, and exits the polarized light which is corrected to be horizontal and parallel to the optical path direction toward the 1/4 wave plate 13, then the polarized light rotates by 90 degrees to the polarization state by the 1/4 wave plate 13, is reflected by the reflector 14, and enters the lens 113 of the dual-fiber polarization-maintaining collimator 11 in a manner of inclining to the optical path direction after the 1/4 wave plate 13, and finally is coupled into the second polarization fiber 112. By controlling the extension and retraction of the piezoelectric ceramic, the position of the reflector 14 can be adjusted, and the optical path length can be adjusted. Meanwhile, the PBC polarization beam combining prism 12 deflects the horizontal slow axis polarized light transmitted to the dual-fiber polarization maintaining collimator 11 by a certain angle, and meanwhile, the PBC polarization beam combining prism 12 transmits the fast axis polarized light with a certain angle to the 1/4 wave plate 13 but cannot be corrected to be transmitted horizontally, so that the fast axis cut-off is realized.

Second embodiment of the miniature polarization-maintaining delay line:

referring to fig. 2, on the basis of the first embodiment, 1/4 wave plate 13 can be attached to the end surface of the reflector 14 facing the PBC polarization beam combining prism 12, and 1/4 wave plate 13 can also realize rotation of the polarization state of the polarized light, and this modification can also realize the purpose of the present invention.

Therefore, the transmission motor, the coupler and the lead screw are replaced by piezoelectric ceramics to adjust the optical path, the double-fiber polarization-maintaining collimator is used for replacing two single-fiber collimators, the purposes of reducing the size and parts are achieved, the large-size pyramid prism is replaced by the combination of the small-size polarization beam combining prism and the 1/4 wave plate, the polarization optical path of the product can be optimized, the size of an optical element is reduced, the processing difficulty of the crystal is reduced, the cost of the device is reduced, the processing precision can reach the level of mum, the repetition frequency can reach the level of kHZ, and the high-speed high-precision adjustment of the optical path can be realized by utilizing the precise adjustment of the piezoelectric ceramics.

Claims

1. A piezoelectric ceramic-based miniature polarization-maintaining delay line is characterized by comprising a double-fiber polarization-maintaining collimator, a PBC polarization beam combining prism, an 1/4 wave plate and a reflector which are arranged along the direction of a light path;

the miniature polarization-maintaining delay line further comprises piezoelectric ceramics, the telescopic end part of the piezoelectric ceramics in the light path direction is connected with the reflector, and the piezoelectric ceramics drives the reflector to move along the light path direction.

2. The miniature polarization-maintaining delay line of claim 1, wherein:

the 1/4 wave plate is attached to the end face, facing the reflecting mirror, of the PBC polarization beam combining prism.

3. The miniature polarization-maintaining delay line of claim 1, wherein:

the 1/4 wave plate is attached to the end face, facing the PBC polarization beam combining prism, of the reflecting mirror.