High-stability light emitting device

Abstract

The utility model relates to a high-stability emission optical device, which is characterized in that a TO-CAN is fixedly sleeved with a tube body, a rotating ring is arranged between the tube body and an LC adapter, and an optical isolator for coupling the TO-CAN and the LC adapter is fixed in the rotating ring; and in the process of axially rotating the rotating ring, the tube body, the rotating ring and the LC adapter are pressed and fixed after a preset included angle is formed between the polarization state direction of the optical isolator and the polarization state direction of a laser chip in the TO-CAN. The optical isolator has the beneficial effects that when an included angle in the polarization state direction appears, the optical isolator can generate extra insertion loss so as to reduce the optical power, the insertion loss can be adjusted at will because the rotating ring can rotate at any angle, and the tube body, the rotating ring and the LC adapter are pressed and fixed after the rotating ring is rotated to a required optical power range, so that the optical power is reduced. The high-stability emission optical device TE manufactured by the method is more excellent than the original scheme, and meanwhile, only one material needs to be prepared in the scheme, so that the high-stability emission optical device TE can be suitable for mass production.

Description

Technical Field

[0001] The utility model relates to the technical field of optical communication devices, in particular to a high-stability transmitting optical device. Background Art

[0002] Among optical communication devices, there are special application scenarios that use high-stability transmitting optical devices (i.e., low TE, TE is tracking error, which refers to the difference in coupling efficiency at different temperatures). The specific structure of the high-stability transmitting optical device is: a coaxially arranged TO-CAN and an LC adapter, a tube body is fixedly mounted on the TO-CAN, an adjustment ring of corresponding height is provided between the tube body and the LC adapter, and an optical isolator is fixed on the LC adapter to couple the TO-CAN and the LC adapter, such as Figure 1 As shown, the current solution generally adopts a height adjustment ring. The reason is that the focal length of TO-CAN is different, so the optical power difference between the LC adapter and the tube body is relatively large when the height is fixed. The actual product requires the optical power to be within a very small range, so it is usually necessary to make adjustment rings of multiple heights (usually 20 types, one size per 10um height interval). In addition, this type of high-stability emitting optical device must be pressed against the LC adapter + height adjustment ring + tube body before laser welding. The gap sliding adjustment ring cannot be used, so there are many materials and mass production is difficult to manage. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a highly stable emitting optical device to overcome the deficiencies in the above-mentioned prior art.

[0004] The utility model solves the above-mentioned technical problem with the following technical solution: a highly stable transmitting optical device, comprising: a coaxially arranged TO-CAN and an LC adapter, a tube body is fixedly mounted on the TO-CAN, a rotating ring that can rotate 360° axially is provided between the tube body and the LC adapter, an optical isolator for coupling the TO-CAN with the LC adapter is fixed in the rotating ring, and the tube body, the rotating ring and the LC adapter are pressed and fixed after the polarization state direction of the optical isolator and the polarization state direction of the laser chip in the TO-CAN form a predetermined angle during the axial rotation of the rotating ring.

[0005] On the basis of the above technical solution, the present invention can also be improved as follows.

[0006] Furthermore, the inner cavity of the rotating ring is stepped, and the optical isolator is supported by the steps of the inner cavity of the rotating ring.

[0007] Furthermore, the optical isolator is fixed in the rotating ring by gluing.

[0008] Furthermore, the tube body and the rotating ring are fixed by laser spot welding after being pressed tightly.

[0009] Furthermore, the LC adapter and the rotating ring are pressed tightly and then fixed by laser spot welding.

[0010] The beneficial effect of the utility model is that the optical isolator is mounted on the rotating ring instead of the LC adapter as in the prior art. Since the rotating ring has only one height (i.e., the height corresponding to the optimal focal length), the coupled optical power is relatively large, while the optical power required by the actual product is within a very small range. At this time, the rotating ring is axially rotated to make an angle between the polarization state direction of the optical isolator and the polarization state direction of the laser chip in the TO-CAN. When the angle of the polarization state direction appears, the optical isolator will generate additional insertion loss, resulting in a decrease in optical power. The insertion loss value is usually cosθ×cosθ. In addition, since the rotating ring can be rotated at any angle, the insertion loss can be adjusted arbitrarily. After rotating to the required optical power range, the tube body, the rotating ring and the LC adapter are pressed and fixed. The high-stability transmitting optical device TE manufactured in this way is better than the original solution (the reason is that the optical power range can be adjusted to a smaller range, and the original solution has the problem of a larger optical power range due to discontinuous focal length). At the same time, the present solution only needs to prepare one material and can adapt to mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of a high-stability light-emitting device in the prior art;

[0012] Figure 2 This is a structural diagram of the high-stability optical emission device in the utility model;

[0013] Figure 3 This is the working principle diagram of the optical isolator;

[0014] Figure 4 The optical path diagram shows that the polarization direction of the optical isolator and the polarization direction of the laser chip form a 45° angle;

[0015] Figure 5 This is the optical path diagram where the polarization direction of the optical isolator and the polarization direction of the laser chip are at an angle of 20°.

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0017] 1. TO-CAN, 110, laser chip, 2. LC adapter, 3. tube body, 4. rotating ring, 5. optical isolator. DETAILED DESCRIPTION

[0018] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0019] Example 1

[0020] like Figure 2 As shown, a high-stability optical transmitting device comprises: a coaxially arranged TO-CAN 1 and an LC adapter 2, a tube body 3 is fixedly mounted on the TO-CAN 1, a rotating ring 4 which can rotate 360° axially is arranged between the tube body 3 and the LC adapter 2, that is, the rotating ring 4 can rotate axially at any angle, an optical isolator 5 for coupling the TO-CAN 1 with the LC adapter 2 is fixed in the rotating ring 4, and the tube body 3, the rotating ring 4 and the LC adapter 2 are pressed and fixed after the polarization state direction of the optical isolator 5 and the polarization state direction of the laser chip 110 in the TO-CAN 1 are at a predetermined angle during the axial rotation of the rotating ring 4;

[0021] In this solution, the optical isolator 5 is installed on the rotating ring 4, rather than on the LC adapter 2 in the prior art. Since the rotating ring 4 has only one height (i.e., the height corresponding to the optimal focal length), the coupled optical power is relatively large, while the optical power required by the actual product is within a very small range. At this time, the rotating ring 4 is axially rotated to make an angle between the polarization state direction of the optical isolator 5 and the polarization state direction of the laser chip 110 in the TO-CAN1. When the polarization state angle appears, the optical isolator 5 will produce additional insertion loss, resulting in a decrease in optical power. The insertion loss value is usually cosθ×cosθ. Since the rotating ring 4 can be rotated at any angle, the insertion loss can be adjusted arbitrarily. After rotating to the required optical power range, the tube body 3, the rotating ring 4 and the LC adapter 2 are pressed and fixed. The high-stability transmitting optical device TE manufactured in this way is better than the original solution (the reason is that the optical power range can be adjusted to a smaller range, and the original solution has the problem of a larger optical power range due to discontinuous focal length). At the same time, the present solution only needs to prepare one material and can adapt to mass production.

[0022] like Figure 3 As shown in FIG. 1 , it is a working principle diagram of the optical isolator 5. The optical isolator 5 includes a polarizer, a Faraday rotator, and an analyzer arranged in sequence. The forward light polarization state matches the analyzer and can pass through, and the insertion loss is very small. However, the reflected light polarization state does not match the polarizer, and the light cannot pass through, and the insertion loss is very large. Figure 4 As shown in FIG. 1 , when the polarization direction of the optical isolator 5 and the polarization direction of the laser chip 110 are at an angle of 45°, the insertion loss value is: cos45°×cos45°=0.5, which is about 3dB. Figure 5 As shown, when the polarization direction of the optical isolator 5 and the polarization direction of the laser chip 110 are at an angle of 20°, the insertion loss value is: cos20°×cos20°=0.88, which is about 0.54 dB.

[0023] Example 2

[0024] like Figure 2As shown, this embodiment is a further improvement on the basis of embodiment 1, and the details are as follows:

[0025] The inner cavity of the rotating ring 4 is stepped, and the optical isolator 5 is supported by the steps of the inner cavity of the rotating ring 4, which can make it more convenient to fix the optical isolator 5 and has better stability. Usually, the optical isolator 5 is fixed in the rotating ring 4 by gluing.

[0026] The tube body 3 and the rotating ring 4 are fixed by laser spot welding after being pressed tightly, and the LC adapter 2 and the rotating ring 4 are also fixed by laser spot welding after being pressed tightly.

[0027] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A highly stable emitting optical device, comprising: A TO-CAN (1) and an LC adapter (2) are coaxially arranged, wherein a tube body (3) is fixedly mounted on the TO-CAN (1), characterized in that a rotating ring (4) capable of axially rotating 360 degrees is provided between the tube body (3) and the LC adapter (2), an optical isolator (5) for coupling the TO-CAN (1) and the LC adapter (2) is fixed inside the rotating ring (4), and the tube body (3), the rotating ring (4) and the LC adapter (2) are pressed and fixed after the polarization state direction of the optical isolator (5) and the polarization state direction of the laser chip (110) in the TO-CAN (1) form a predetermined angle during the axial rotation of the rotating ring (4).

2. A highly stable emitting optical device according to claim 1, characterized in that: The inner cavity of the rotating ring (4) is stepped, and the optical isolator (5) is supported by the steps of the inner cavity of the rotating ring (4).

3. A highly stable emitting optical device according to claim 2, characterized in that: The optical isolator (5) is fixed inside the rotating ring (4) by gluing.

4. A highly stable emitting optical device according to claim 1, characterized in that: The tube body (3) and the rotating ring (4) are fixed by laser spot welding after being pressed tightly.

5. A highly stable emitting optical device according to claim 4, characterized in that: The LC adapter (2) and the rotating ring (4) are pressed tightly and fixed by laser spot welding.

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