CN217360376U - Small reflective circulator - Google Patents

Abstract

The utility model discloses a small-size reflective circulator contains following component in proper order: the device comprises a first collimator, a first prism, a first polarization beam splitter, a polarization state converter, a second polarization beam splitter, a second prism, a second collimator and a third collimator. The first polarization beam splitter and the second polarization beam splitter have the same structure, and the setting state of the second polarization beam splitter is the state of the first polarization beam splitter after the current setting state is rotated by 90 degrees clockwise; the first prism and the second prism have the same structure, and the setting state of the second prism is the state of the first prism after clockwise rotating 180 degrees in the current setting state; the polarization state converter consists of a Faraday rotator and a dextrorotation optical rotation crystal, and can enable the linearly polarized light transmitted in the forward direction to rotate by pi/2 clockwise, and the polarization direction of the linearly polarized light transmitted in the reverse direction is unchanged. The circulator multiplexes the magneto-optical crystal, and has lower cost and smaller structure.

Description

Small reflective circulator

Technical Field

The utility model relates to an optical circulator, in particular to a small-size reflective circulator.

Background

The optical circulator is a non-reciprocal optical device with multi-port input and output, and has a great deal of application in the fields of test equipment, communication and data transmission. There are generally three ports, which are used to realize the transmission of optical signals from a first port to a second port, and the signals of the second port cannot be output from the first port, but can realize the transmission from the second port to a third port. If the output is not output according to the specified port, the loss of the device to the optical signal is very large, and the device plays a role in isolation.

The existing optical circulator in the current market has larger volume and higher cost.

Disclosure of Invention

In order to overcome the problems of higher cost, larger volume and the like of the existing optical circulator, the utility model provides a small reflective circulator.

In order to achieve the above object, the present invention provides a small reflective circulator, which comprises the following components arranged in sequence along a light path:

the first collimator is composed of an optical fiber and a collimating lens;

a first prism for axially shifting incident light;

the first polarization beam splitter transmits the P polarized light and reflects the S polarized light;

the polarization state converter consists of a Faraday rotator and a right-handed optical crystal;

the setting state of the second polarization beam splitter is the state of the first polarization beam splitter which is rotated by 90 degrees clockwise at the current setting state;

the setting state of the second prism is the state of the first prism which is rotated by 180 degrees clockwise in the current setting state;

the second collimator is composed of an optical fiber and a collimating lens;

the third collimator is composed of an optical fiber and a collimating lens;

the method is characterized in that: the first polarization beam splitter and the second polarization beam splitter have the same structure, and the setting state of the second polarization beam splitter is the state of the first polarization beam splitter after clockwise rotating by 90 degrees.

The first collimator and the second collimator are on the same side, and the third collimator is at 90 degrees to the first and second collimators.

The beneficial effects of the utility model are that, reduce current optical circulator size and cost.

Drawings

FIG. 1 is a schematic structural view of a small reflective circulator according to the present invention;

FIG. 2 is a schematic diagram of a forward transmission light path of the small reflective circulator of the present invention;

fig. 3 is a schematic view of another forward transmission light path of the small reflective circulator of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the small reflective circulator of the present invention includes a first collimator 1, a first prism 2, a first polarization beam splitter 3, a polarization state converter 4, a second polarization beam splitter 5, a second collimator 6, a second prism 7, and a third collimator 8.

Fig. 2 is the utility model discloses one of them forward transmission light path schematic diagram of small-size reflective circulator, the polarized light P light of third collimator 8 input reachs second polarization beam splitter 5 through second prism 7, polarized light P light sees through second polarization beam splitter 5 and reachs polarization state converter 4, polarization state converter 4 makes forward transmission' S light rotatory 90 degrees, become polarization state S light, polarization state S light transmission is through first polarization beam splitter 3, extend the light path through first prism 2 afterwards and reachd first collimator 1.

Fig. 3 is the another forward transmission light path schematic diagram of small-size reflective circulator of the utility model, the polarization state S light of 1 input of first collimater reaches first polarization beam splitter 3 through first prism 2, and polarization state S light passes through first polarization beam splitter 3 and reachs polarization state converter 4, and polarization state converter 4 makes reverse transmission' S light polarization state remain unchanged, and polarization state S light reachs second polarization beam splitter 5 and is reflected by it, reachs second collimater 6.

The above description is only for the purpose of illustration of the embodiments of the present invention, and not for the purpose of limitation, and any insubstantial modifications are intended to be covered by the claims of the present invention.

Claims (2)

1. A compact reflective circulator, comprising the following elements arranged in sequence along an optical axis of normal light incidence:

the first collimator is composed of an optical fiber and a collimating lens;

a first prism for axially shifting incident light;

the first polarization beam splitter transmits the P polarized light and reflects the S polarized light;

the polarization state converter consists of a Faraday rotator and a right-handed optical crystal;

the setting state of the second polarization beam splitter is the state of the first polarization beam splitter which is rotated by 90 degrees clockwise at the current setting state;

the setting state of the second prism is the state of the first prism which is rotated by 180 degrees clockwise in the current setting state;

the second collimator is composed of an optical fiber and a collimating lens;

the third collimator is composed of an optical fiber and a collimating lens;

the method is characterized in that: the first polarization beam splitter and the second polarization beam splitter have the same structure, and the setting state of the second polarization beam splitter is the state of the first polarization beam splitter after clockwise rotating by 90 degrees.

2. The compact reflective circulator of claim 1 wherein: the first collimator and the second collimator are on the same side, and the third collimator forms an angle of 90 degrees with the first collimator and the second collimator.

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