CN204496045U - A kind of array type optical isolator - Google Patents

Abstract

A kind of array type optical isolator, the first high density arrays collimating apparatus, walk-off type isolator assemblies and the second high density arrays collimating apparatus is comprised successively along forward light path, described walk-off type isolator assemblies comprises the first birefringece crystal, Garnet gyrotropi crystal, 1/2 wave plate and the second birefringece crystal successively along forward light path, and array type optical isolator of the present utility model has good temperature stability, array quantity is large, volume size is little, be easy to realize modularization.

Description

An Array Type Optical Isolator

technical field

The utility model relates to the field of optical fiber communication and laser, in particular to an array type optical isolator.

Background technique

The optical isolator is a widely used optical passive device. During the transmission process of the signal light from the light source to the receiving system, it is reflected by many interfaces, and the reflected light finally returns to the input end, which increases the risk of damage to the system. Therefore, it is necessary to add Optical isolators to reduce the impact of returning light on the system.

With the rapid development of WDM optical network technology, it is necessary to perform multiplexing and cross-linking in the optical domain. In an N×M fiber array, if a traditional optical isolator is used, N×M single-channel devices are required, and each collimator and focusing lens are required to align with its own fiber, and the focusing lens must be accurate Align the collimating lens beam. Even if fiber optic digital is not considered, the alignment of each pair of collimators is very difficult to install or debug, and the alignment process will become more cumbersome and time-consuming.

In addition, each collimator lens, focusing lens, and optical fiber needs lateral support, which will make the system bulky and difficult to combine into a complete unit. Therefore, it is necessary to introduce an array-type high-density collimator to make it small in size, compact in structure, lower in cost, easy to debug, and capable of handling multiple compact optical isolators.

Utility model content

The utility model solves the above technical problems and provides an array type optical isolator.

In order to solve the above technical problems, the technical solution of the utility model is: an array type optical isolator, which sequentially includes a first high-density array collimator, a walk-off type isolator assembly and a second high-density array along the forward optical path Collimator, the walk-off type isolator assembly sequentially includes a first birefringent crystal, a Garnet optical active crystal, a 1/2 wave plate and a second birefringent crystal along the forward optical path, and the incident light passes through the first high-density array The collimator is collimated so that the parallel incident light enters the walk-off type isolator assembly, and the parallel incident light enters the first birefringent crystal and decomposes into two polarized lights whose polarization states are perpendicular to each other, and the two polarized lights are sequentially transmitted into the Garnet optical rotation crystal The polarization state conversion of the two polarized lights after the 1/2 wave plate is coupled together through the second birefringent crystal and transmitted to the second high-density array collimator, and the incident light is collimated by the second high-density array collimator The parallel incident light enters the walk-off type isolator component, and the parallel incident light enters the second birefringent crystal and decomposes into two polarized lights with polarization states perpendicular to each other. The polarization states of the two polarized lights behind the crystal are not converted, and the two polarized lights pass through the first birefringent crystal from different positions respectively, and cannot be coupled into a beam of light.

Further, both the first high-density array collimator and the second high-density array collimator are array collimators whose beams are parallel to each other, and the incident port of the first high-density array collimator is collimated with the second high-density array collimator The output port of the device is staggered by one port position.

Further, both the first high-density array collimator and the second high-density array collimator include a high-density optical fiber head array, a lens, and a tube made of glass or metal.

Further, the high-density optical fiber head array adopts an array composed of a single-mode optical fiber with a smaller outer diameter fused to one end of an ordinary single-mode optical fiber, an array of ordinary single-mode optical fibers or an array of optical fibers with a small outer diameter coupled by V-groove.

Further, the first birefringent crystal and the second birefringent crystal use yttrium vanadate or lithium niobate.

Further, two walk-off type isolator assemblies are connected in series between the first high-density array collimator and the second high-density array collimator.

The array type optical isolator of the utility model has good temperature stability, large number of arrays, small size and easy realization of modularization.

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

Fig. 1 is a structural representation of the utility model;

Fig. 2 is the reverse optical path of the walk-off type isolator assembly of the utility model;

Fig. 3 is a schematic diagram of the end face of the high-density array optical fiber head of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described further.

An array type optical isolator shown in Fig. 1 includes a first high-density array collimator 11, a walk-off type isolator assembly 12 and a second high-density array collimator 13 in sequence along the forward optical path. The walk-off type isolator assembly 13 sequentially includes a first birefringent crystal 104, a Garnet optically active crystal 105, a 1/2 wave plate 106 and a second birefringent crystal 107 along the forward optical path, and the incident light is collimated through the first high-density array The collimator 11 is collimated so that the parallel incident light enters the walk-off type isolator assembly 12, and the parallel incident light enters the first birefringent crystal 104 and is decomposed into two polarized lights whose polarization states are perpendicular to each other, and the vertically polarized light directly passes through the first birefringent crystal 104 Crystal 104, the polarization of horizontally polarized light passes through, and a certain position is generated between the two polarized lights. After the two polarized lights enter the Garnet optical rotation crystal 105, the polarization states are both rotated clockwise by 45°, and then pass through the 1/2 wave plate 106 , the polarization state is rotated clockwise by 45°, the polarization state of the two polarized lights is converted after two rotations, that is, the original vertically polarized light becomes horizontally polarized light, the original horizontally polarized light becomes vertically polarized light, and the transformed The polarized light is then coupled together through the second birefringent crystal 107 and transmitted to the second high-density array collimator 13 .

The incident light shown in Figure 2 is collimated by the second high-density array collimator 13 into parallel incident light entering the walk-off type isolator assembly 12, and the parallel incident light enters the second birefringent crystal 107 and decomposes into two polarization states mutually For vertically polarized light, the two polarized lights are rotated counterclockwise by 1/2 wave plate 106 for 45°, and then passed through the Garnet optical rotation crystal 105, the light beam is rotated by 45° clockwise, the polarization state does not change after the two rotations, and after the first The two beams of polarized light of the birefringent crystal 104 are output through different positions and cannot be coupled, so they cannot continue to transmit, achieving the effect of reverse isolation.

In the above embodiment, the first birefringent crystal 104 and the second birefringent crystal 107 use yttrium vanadate or lithium niobate, and two high-density array collimators 11 and the second high-density array collimator 13 are used Several walk-off type isolator assemblies 12 are connected in series to achieve better isolation effect.

In the above embodiment, the first high-density array collimator 11 and the second high-density array collimator 12 are array collimators whose beams are parallel to each other, and the incident port of the first high-density array collimator 11 is connected to the second high-density array collimator. The output port of the density array collimator 12 is staggered up and down or left and right by a port position, and the first high density array collimator 11 and the second high density array collimator 12 both include a high density fiber optic head array 101, a lens 102, a glass Or tube 103 made of metal, the high-density optical fiber head 101 array adopts an array composed of a single-mode optical fiber with a smaller outer diameter welded at one end of an ordinary single-mode optical fiber, an array of ordinary single-mode optical fibers coupled by a V-groove or a small Outer diameter optical fiber array, the end face of the high-density optical fiber head 101 is shown in Figure 3. The collimator array is made of φ36μm optical fiber, the maximum interval is 144μm-36μm=108μm, and the included angle is about 3.8??, which has little influence on the relevant optical parameters. .

Although the present utility model has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that, without departing from the spirit and scope of the present utility model defined by the appended claims, changes in form and details have been made to the present utility model. Various changes are made in the utility model, all of which are within the protection scope of the utility model.

Claims (6)

1. an array type optical isolator, it is characterized in that: comprise the first high density arrays collimating apparatus successively along forward light path, walk-off type isolator assemblies and the second high density arrays collimating apparatus, described walk-off type isolator assemblies comprises the first birefringece crystal successively along forward light path, Garnet gyrotropi crystal, 1/2 wave plate and the second birefringece crystal, incident light is that parallel input light enters walk-off type isolator assemblies by the first high density arrays collimating device collimation, parallel input light is decomposed into two mutually perpendicular polarized lights of polarization state after entering the first birefringece crystal, two polarized lights transmit the polarization converted entering Garnet gyrotropi crystal and 1/2 latter two polarized light of wave plate successively, be coupled by the second birefringece crystal again and be transferred to the second high density arrays collimating apparatus, incident light is that parallel input light enters walk-off type isolator assemblies by the second high density arrays collimating device collimation, parallel input light is decomposed into two mutually perpendicular polarized lights of polarization state after entering the second birefringece crystal, two polarized lights transmit the polarization state entering 1/2 wave plate and latter two polarized light of Garnet gyrotropi crystal successively not to be changed, two polarized lights respectively from diverse location through the first birefringece crystal, cannot be coupled and become light beam.

2. a kind of array type optical isolator according to claim 1, it is characterized in that: the first high density arrays collimating apparatus and the second high density arrays collimating apparatus are the array collimator that light beam is parallel to each other, the entry port of the first high density arrays collimating apparatus and the exit ports of the second high density arrays collimating apparatus stagger the position of a port.

3. a kind of array type optical isolator according to claim 1 and 2, is characterized in that: the first high density arrays collimating apparatus and the second high density arrays collimating apparatus include high-density optical-fiber head array, lens and by glass or metal pipe.

4. a kind of array type optical isolator according to claim 3, is characterized in that: described high-density optical-fiber head array adopt be made up of the single-mode fiber of the less external diameter of general single mode fiber one end welding array, be coupled by V-groove general single mode fiber array or little external diameter fiber array.

5. a kind of array type optical isolator according to claim 1, is characterized in that: the first described birefringece crystal and the second birefringece crystal adopt Yttrium Orthovanadate or lithium niobate.

6. a kind of array type optical isolator according to claim 1, is characterized in that: adopt two walk-off type isolator assemblies series connection between the first described high density arrays collimating apparatus and the second high density arrays collimating apparatus.