Fiber collimator

Abstract

This utility model relates to the field of optical technology and discloses an optical fiber collimator to improve product yield. The device includes: an adjustment cylinder with an APC interface fixed at the top; inside, a wave spring, a lens mounting cylinder, and a guide sleeve are sequentially installed in order of distance from the fiber end face from near to far; the collimating lens is fixed in the lens mounting cylinder; the guide sleeve abuts against the adjustment housing and is limited and guided by a guide pin; the external thread of the adjustment cylinder mates with the internal thread of the adjustment housing; the adjustment cylinder is provided with at least two locking screws for compressing a locking spring; the wave spring does not contact the APC interface; the angle formed between the fiber end face in the APC interface and the optical axis of the collimating lens is 101.79°±0.025°, and the optical axis of the collimating lens intersects the center line of the APC connector at the fiber end face of the APC interface.

Description

Technical Field

[0001] This utility model relates to the field of optical technology, and in particular to an optical fiber collimator. Background Technology

[0002] As a core component of systems such as quantum optics, fiber optic communication, and optical measurement, fiber optic collimators play a crucial role in converting divergent laser beams from optical fibers into collimated beams or efficiently coupling externally collimated laser beams into single-mode optical fibers. Their performance directly affects the efficiency and long-term stability of the entire system.

[0003] In precision optical applications such as laser interferometry, the stability of the collimation system is a key factor affecting the final measurement accuracy. With the continuous development of optical technology, fiber optic collimators are facing increasingly higher requirements in terms of accuracy and stability.

[0004] Existing fiber optic collimators typically incorporate a spring structure between the fiber optic interface and the lens mounting structure. By adjusting the distance between the fiber optic interface and the lens mounting structure, different wavelengths can be matched. This provides good stability when connected to a PC interface, but results in a higher failure rate when using an APC (Angled Physical Contact) interface. Utility Model Content

[0005] The purpose of this invention is to disclose an optical fiber collimator to improve product yield.

[0006] To achieve the above objectives, the fiber optic collimator disclosed in this utility model includes:

[0007] The adjusting cylinder (1) has an APC interface fixed on the top. The adjusting cylinder (1) contains a lens mounting cylinder (6), and the lens (4) is fixed in the lens mounting cylinder (6).

[0008] The inside of the adjusting cylinder (1) is equipped with a wave spring (3), a lens mounting cylinder (6) and a guide sleeve (9) in order of distance from the fiber end face from near to far. The guide sleeve (9) and the adjusting cylinder (1) are limited and guided by the guide pin (8). The external thread of the adjusting cylinder (1) is engaged with the internal thread of the adjusting housing (10) to adjust the length of the wave spring (3) by rotation in a non-locked state.

[0009] The adjusting cylinder (1) is provided with at least two locking screws (11) to compress the locking spring (2), so that the locking spring (2) can be locked onto the lens mounting cylinder (6) after the user adjusts it to the correct position.

[0010] Among them, the wave spring (3) has no contact with the APC interface; the angle formed by the optical fiber end face in the APC interface and the optical axis of the collimating lens (4) is 101.79°±0.025°, and the optical axis of the collimating lens (4) intersects the center line of the APC connector at the optical fiber end face of the APC interface.

[0011] Preferably, the thread pitch between the adjusting cylinder (1) and the adjusting housing (10) is 0.2 mm.

[0012] Preferably, a support sleeve (7) is provided between the guide sleeve (9) and the lens mounting sleeve (6).

[0013] Preferably, the adjustment gap between the lens mounting cylinder (6), the lens mounting cylinder (6) and the guide sleeve (9) and the adjusting cylinder (1) is 0.005-0.015mm.

[0014] Preferably, the guide pin (8) is fixed in the adjusting cylinder (1).

[0015] Preferably, the APC interface is integrally formed on the top of the adjusting cylinder (1), and the collimating lens (4) is fixed in the lens mounting cylinder (6) by the retaining ring (5).

[0016] This utility model has the following beneficial effects:

[0017] The components are strongly coupled, but the wave spring does not contact the APC interface. The angle formed by the fiber end face in the APC interface and the optical axis of the collimating lens is 101.79°±0.025°, and the optical axis of the collimating lens intersects the center line of the APC connector at the fiber end face of the APC interface. This ensures that the lens mounting cylinder can output a relatively ideal collimated beam in different adjustment positions. Moreover, most of the components adopt conventional structures, which are easy to process and convenient to adjust.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0020] Figure 1 This is an exploded view of the optical fiber collimator disclosed in an embodiment of this utility model.

[0021] Figure 2 This is a cross-sectional view of the internal structure of the fiber optic collimator after assembly, as disclosed in this embodiment of the utility model.

[0022] Figure 3This is a perspective view of the external structure of the assembled fiber optic collimator disclosed in this embodiment of the utility model. Detailed Implementation

[0023] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0024] Example 1

[0025] This embodiment discloses an optical fiber collimator, referring to... Figure 1 , Figure 2 and Figure 3 It includes:

[0026] The adjusting cylinder (1) has an APC interface fixed at the top. Inside, in order of distance from the fiber end face from near to far, a wave spring (3), a lens mounting cylinder (6), and a guide sleeve (9) are installed. The collimating lens (4) is fixed in the lens mounting cylinder (6). The guide sleeve (9) abuts against the adjusting housing (10) and is limited and guided by the adjusting cylinder (1) through the guide pin (8). The external thread of the adjusting cylinder (1) engages with the internal thread of the adjusting housing (10) to adjust the length of the wave spring (3) by rotation in a non-locked state. Optionally, a support sleeve (7) is provided between the guide sleeve (9) and the lens mounting cylinder (6).

[0027] The adjusting cylinder (1) is provided with at least two locking screws (11) to compress the locking spring (2) so that the locking spring (2) can be locked onto the lens mounting cylinder (6) after the user adjusts it to the correct position.

[0028] The wave spring (3) has no contact with the APC interface; the angle formed between the fiber end face in the APC interface and the optical axis of the collimating lens (4) is 101.79°±0.025°, and the optical axis of the collimating lens (4) intersects the center line of the APC connector at the fiber end face of the APC interface. The aforementioned 0.025° is a manufacturing tolerance, and the 101.79° consists of three parts: the first part is the 3.79° angle formed between the perpendicular plane of the center line of the APC connector and the perpendicular plane of the optical axis of the collimating lens (4); the second part is the 8° angle formed between the fiber end face and the perpendicular plane of the center line of the APC connector; and the remaining third part is the right angle formed between the perpendicular plane of the optical axis of the collimating lens (4) and the optical axis; thus, the emitted beam from the fiber end face is converted into a beam parallel to the optical axis of the collimating lens (4) under the refraction of air. The fact that the optical axis of the collimating lens (4) intersects with the center line of the APC connector at the fiber end face of the APC interface further ensures that the optical axis of the final output beam of the fiber collimator in this embodiment is consistent with the optical axis of the collimating lens (4).

[0029] Preferably, in this embodiment, the guide pin (8) is fixed in the adjusting cylinder (1), and the APC interface is integrally formed on the top of the adjusting cylinder (1).

[0030] In this embodiment, to ensure the coaxiality between the various adjustment mechanisms, the adjustment gap between the lens mounting cylinder (6), the lens mounting cylinder (6) and the guide sleeve (9) and the adjustment cylinder (1) is preferably 0.005-0.015mm; furthermore, to improve the sensitivity and accuracy of adjustment, the thread pitch between the adjustment cylinder (1) and the adjustment housing (10) is preferably 0.2mm.

[0031] The installation and adjustment process is as follows:

[0032] The wave spring (3), locking spring (2), lens mounting cylinder (6), support sleeve (7), and guide sleeve (8) are sequentially installed into the adjusting cylinder (1), and finally the adjusting housing (10) is combined with the adjusting cylinder. When the assembly is complete, the wave spring (3) is in a compressed state. By rotating the adjusting housing (10) counterclockwise, the distance between the adjusting housing (10) and the adjusting cylinder (1) increases, the pressure on the wave spring (3) decreases, the spring length increases, and the lens mounting cylinder (6) is pushed to move towards the adjusting housing. At the same time, the support sleeve (7) and the guide sleeve (9) also move and fit tightly against the adjusting housing (10). By rotating the adjusting housing (10) clockwise, the distance between the adjusting housing (10) and the adjusting cylinder (1) decreases, and the guide sleeve (9), support sleeve (7), and lens mounting cylinder (6) are pushed towards the bottom of the adjusting cylinder (1), causing the pressure on the wave spring (3) to increase and the spring length to shorten, while still keeping all components in the adjusting cylinder (1) tightly fitted. Since the thread pitch between the adjusting cylinder (1) and the adjusting housing (10) is 0.2mm, high-precision displacement adjustment of the lens mounting cylinder (6) can be achieved. After adjustment, the locking spring (2) is compressed by rotating the two locking screws (11) on the adjusting cylinder (1) clockwise, so that the locking spring (2) locks the lens mounting cylinder (6) and cannot move, thus achieving the locking state of the entire collimator and enabling the collimator to have long-term stability.

[0033] In summary, the fiber collimator disclosed in this embodiment has strong coupling between its components, but the wave spring does not contact the APC interface. The angle formed by the fiber end face in the APC interface and the optical axis of the collimating lens is 101.79°±0.025°, and the optical axis of the collimating lens intersects the center line of the APC connector at the fiber end face of the APC interface. This ensures that the lens mounting cylinder can output a relatively ideal collimated beam in different adjustment positions. Moreover, most of the components adopt conventional structures, which are easy to process and adjust.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An optical fiber collimator, characterized in that, include: The adjusting cylinder (1) has an APC interface fixed on the top. Inside, in order of distance from the fiber end face from near to far, there are wave springs (3), lens mounting cylinders (6) and guide sleeves (9). The collimating lens (4) is fixed in the lens mounting cylinder (6). The guide sleeve (9) abuts against the adjusting shell (10) and is limited and guided by the adjusting cylinder (1) through the guide pin (8). The external thread of the adjusting cylinder (1) is engaged with the internal thread of the adjusting shell (10) to adjust the length of the wave spring (3) by rotation in a non-locked state. The adjusting cylinder (1) is provided with at least two locking screws (11) to compress the locking spring (2), so that the locking spring (2) can be locked onto the lens mounting cylinder (6) after the user adjusts it to the correct position. Among them, the wave spring (3) has no contact with the APC interface; the angle formed by the optical fiber end face in the APC interface and the optical axis of the collimating lens (4) is 101.79°±0.025°, and the optical axis of the collimating lens (4) intersects the center line of the APC connector at the optical fiber end face of the APC interface.

2. The fiber optic collimator according to claim 1, characterized in that, The thread pitch between the adjusting cylinder (1) and the adjusting housing (10) is 0.2 mm.

3. The fiber optic collimator according to claim 1 or 2, characterized in that, A support sleeve (7) is provided between the guide sleeve (9) and the lens mounting sleeve (6).

4. The fiber optic collimator according to claim 3, characterized in that, The adjustment gap between the lens mounting cylinder (6), the lens mounting cylinder (6) and the guide sleeve (9) and the adjusting cylinder (1) is 0.005-0.015mm.

5. The fiber optic collimator according to claim 4, characterized in that, The guide pin (8) is fixed in the adjusting cylinder (1).

6. The fiber optic collimator according to claim 4, characterized in that, The APC interface is integrally formed on the top of the regulating cylinder (1).

7. The fiber optic collimator according to claim 6, characterized in that, The collimating lens (4) is fixed in the lens mounting tube (6) by a retaining ring (5).

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