Integrated low-loss free space wavelength division multiplexer

Abstract

The utility model provides an integrated low-loss free space wavelength division multiplexer, which comprises a first collimator, a first optical filter, a first reflecting mirror, a second optical filter, a second reflecting mirror, a first prism and a second collimator, a signal collimated by the first collimator is transmitted to the first optical filter through a Gaussian beam, a projection signal and a reflection signal are separated, and the integrated low-loss free space wavelength division multiplexer provided by the utility model has the advantages of high integration, low loss, low cost and the like, and has great use value and economic value.

Description

Technical Field

[0001] The utility model relates to the technical field of space wavelength division multiplexer design, in particular to an integrated low-loss free space wavelength division multiplexer. Background Art

[0002] In current fiber optic communication applications, single-fiber bidirectional technology is widely used, which is what we often call BIDI, that is, one fiber transmits optical signals bidirectionally. The advantage of this technology is that it reduces the cost of fiber optic wiring and the number of panel connector ports. It has a simple structure and mature technology, and is widely used by operators in 5G 25G fronthaul. Conventional single-fiber bidirectional structure uses multiple 3-port devices cascaded into a passive module BIDI 25G CWDM single-fiber bidirectional optical path (such as Figure 1 As shown in the figure, the second conventional structure is due to the breakthrough of coating technology, which can directly realize double-transmittance wavelength division coating, that is, directly use 3-port devices to cascade into a passive module, and the structure is very simple. Figure 2 As shown, both methods have certain defects. For example, the first method has relatively large losses and the second method has relatively high coating costs. Therefore, further improvements are needed. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides an integrated low-loss free-space wavelength division multiplexer with high integration, low loss and low cost.

[0004] The technical solution adopted by the utility model to solve the above problems is:

[0005] The utility model provides an integrated low-loss free-space wavelength division multiplexer, comprising a first collimator for transmitting an optical signal, a first filter, a first reflector, a second filter, a second reflector, a first prism and a second collimator.

[0006] The signal collimated by the first collimator is transmitted to the first filter through a Gaussian beam to separate the projection signal and the reflection signal.

[0007] The first reflector reflects the signal transmitted through the first filter.

[0008] The second filter reflects the signal reflected by the first reflector to the second reflector,

[0009] The second reflector changes the transmission direction to the second collimator through the first prism.

[0010] Furthermore, a third filter is included, and the third filter transmits the reflection signal of the first filter to the second filter.

[0011] Furthermore, it also includes a third reflector, which reflects the signal transmitted by the third filter and transmits it to the fourth filter.

[0012] Furthermore, the fourth filter receives the emission signal of the third reflector and the reflection signal of the second filter, then transmits the signal to the second prism and transmits the transmission signal to the fifth filter.

[0013] The second prism couples the signal to the third collimator.

[0014] Furthermore, the fifth optical filter is connected to the fourth reflector via reflection signal transmission communication and is connected to the fifth reflector via transmission signal transmission communication.

[0015] Furthermore, the fourth reflector and the fifth reflector are connected to a sixth filter via reflection signal communication.

[0016] Furthermore, the sixth filter receives the reflection signal of the fifth reflection mirror and transmits it to the third prism.

[0017] Furthermore, the third prism couples the signal to communicate to a fourth collimator.

[0018] Furthermore, the sixth filter receives the reflection signal of the fourth reflection mirror and transmits it to the sixth reflection mirror.

[0019] The sixth reflector is connected to the fourth prism for signal reflection communication.

[0020] Furthermore, the fourth prism couples the signal to communicate to a fifth collimator.

[0021] The beneficial effects of the utility model are:

[0022] The utility model provides an integrated low-loss free-space wavelength division multiplexer with the advantages of high integration, low loss, low cost, etc. In the design and development process, the application fully utilizes the thin-film filter with large-angle incidence in free space and several reflectors to achieve integration through Gaussian beam coupling. The application has a simple optical structure and low insertion loss, which greatly saves production costs. In addition, the application can achieve the characteristics of small size, low loss, high integration, single-sided output, etc. Therefore, it has great use value and economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the cascade connection of conventional single-fiber bidirectional passive devices in the prior art of the utility model;

[0024] Figure 2 This is a schematic diagram of direct cascading of passive devices on ports in the prior art of the utility model;

[0025] Figure 3 The utility model is a schematic diagram of the structure of an integrated low-loss free-space wavelength division multiplexer. DETAILED DESCRIPTION

[0026] The following is a detailed description of the implementation of the present invention in conjunction with the accompanying drawings, which are for reference and illustration only and do not constitute a limitation on the scope of patent protection of the present invention.

[0027] like Figure 3 As shown, the utility model provides an integrated low-loss free-space wavelength division multiplexer, comprising a first collimator (1) for transmitting an optical signal, a first filter (2), a first reflector (3), a second filter (4), a second reflector (5), a first prism (6) and a second collimator (7),

[0028] The signal collimated by the first collimator 1 is transmitted to the first filter (2) through a Gaussian beam to separate the projection signal and the reflection signal.

[0029] The first reflector (3) reflects the signal transmitted through the first filter (2).

[0030] The second filter (4) reflects the signal reflected by the first reflector (3) to the second reflector (5),

[0031] The second reflector (5) changes the transmission direction to the second collimator (7) via the first prism (6).

[0032] In this embodiment, a third filter (8) is further included, and the third filter (8) transmits the reflection signal of the first filter (2) to the second filter (4).

[0033] In this embodiment, a third reflector (9) is further included, and the third reflector (9) reflects the signal transmitted by the third filter (8) and transmits it to the fourth filter (10).

[0034] In this embodiment, the fourth filter (10) receives the emission signal of the third reflector (9) and the reflection signal of the second filter (4), and then transmits the signal to the second prism (11) and transmits the transmission signal to the fifth filter (12).

[0035] The second prism (11) couples the signal to the third collimator (13).

[0036] In this embodiment, the fifth optical filter (12) is connected to the fourth reflector (14) via reflection signal transmission communication and is connected to the fifth reflector (15) via transmission signal transmission communication.

[0037] In this embodiment, the fourth reflector (14) and the fifth reflector (15) are connected to a sixth filter (16) via reflection signal communication.

[0038] In this embodiment, the sixth filter (16) receives the reflection signal of the fifth reflection mirror (15) and transmits it to the third prism (17).

[0039] In this embodiment, the third prism (17) couples the signal to the fourth collimator (18).

[0040] In this embodiment, the sixth filter (16) receives the reflection signal of the fourth reflection mirror (14) and transmits it to the sixth reflection mirror (19).

[0041] The sixth reflector (19) is connected to a fourth prism (20) for signal reflection communication.

[0042] In this embodiment, the fourth prism (20) couples the signal to the fifth collimator (21).

[0043] The present application is further described below in conjunction with the examples. Figure 3 As shown in FIG. 1 , the emission optical signals W1, W2, W3, W4, W5, and W6 from the common port (COM) are collimated by the first collimator (1) and transmitted to the first filter (2) through a Gaussian beam to separate the transmission signal W1 and the reflection signals W2, W3, W4, W5, and W6.

[0044] The transmission signal W1 is transmitted to the second filter (4) through the first reflector (3).

[0045] The light is reflected by the second filter (4) and transmitted to the second reflector (5), and finally reflected and transmitted to the first prism (6) and the second collimator (7), and the transmission direction is changed to horizontal through the first prism (6) and Gaussian coupled to the second collimator (7);

[0046] The signals W2, W3, W4, W5 and W6 are reflected by the second filter (4) and the third filter (8) to produce signals W3, W4, W5 and W6, while the signal W2 is transmitted to the second reflector (5), and is also reflected to the first prism (6) and coupled to the second collimator (7). The signal W5 is separated by the third filter (8) to produce a transmission signal W5, which is reflected by the third reflector (9) and the fourth filter (10) to the second prism (11), and is also changed in horizontal direction to be coupled to the third collimator (13). Similarly, the signal W3 is reflected by the filters 2, 3, 4 and 5 and is then transmitted to the third collimator (13). The fifth filter (12) is transmitted through the second prism (11), the sixth filter (16) and the sixth reflector (19), and then reflected to the fourth prism (20), and finally coupled to the fifth collimator (21). Similarly, the W4 signal is reflected by filters 2, 3, 4, 5, 6, and 10, and then transmitted through the sixth filter (16) to the sixth reflector (19), and then reflected to the fourth prism (20), and finally coupled to the fifth collimator (21). Similarly, W5 and W6 are transmitted to the third collimator (13), and other UPG (upgrade port) signals are transmitted to the fourth collimator (18).

[0047] The utility model provides a low-loss free-space single-fiber bidirectional passive device, which has the advantages of being easy to use, effectively improving work efficiency and reducing costs. During use, the application can quickly strip the adhesive butterfly cable, and the stripping is completed at one time without the need for segmented stripping. In particular, the stripping force is greatly reduced after the cable sheath is heated, and the cable sheath can be stripped by simply pulling it outwards, which provides great convenience to the user. Therefore, it has great use value and economic value.

[0048] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. An integrated low-loss free-space wavelength division multiplexer, characterized in that: The invention comprises a first collimator (1) for emitting an optical signal, a first filter (2), a first reflector (3), a second filter (4), a second reflector (5), a first prism (6) and a second collimator (7), The signal collimated by the first collimator (1) is transmitted to the first filter (2) through a Gaussian beam to separate the projection signal and the reflection signal. The first reflector (3) reflects the signal transmitted through the first filter (2). The second filter (4) reflects the signal reflected by the first reflector (3) to the second reflector (5), The second reflector (5) changes the transmission direction to the second collimator (7) via the first prism (6).

2. An integrated low-loss free-space wavelength division multiplexer as claimed in claim 1, characterized in that: It also comprises a third filter (8), wherein the third filter (8) transmits the reflection signal of the first filter (2) to the second filter (4).

3. An integrated low-loss free-space wavelength division multiplexer as claimed in claim 2, characterized in that: It also comprises a third reflector (9), wherein the third reflector (9) reflects the signal transmitted by the third optical filter (8) and transmits it to a fourth optical filter (10).

4. An integrated low-loss free-space wavelength division multiplexer as claimed in claim 3, characterized in that: The fourth optical filter (10) receives the emission signal of the third reflector (9) and the reflection signal of the second optical filter (4), and then transmits the signal to the second prism (11) and transmits the transmission signal to the fifth optical filter (12). The second prism (11) couples the signal to the third collimator (13).

5. An integrated low-loss free-space wavelength division multiplexer as claimed in claim 4, characterized in that: The fifth optical filter (12) is connected to the fourth reflector (14) via reflection signal transmission communication and is connected to the fifth reflector (15) via transmission signal transmission communication.

6. An integrated low-loss free-space wavelength division multiplexer as claimed in claim 5, characterized in that: The fourth reflector (14) and the fifth reflector (15) are connected to a sixth filter (16) via reflection signal communication.

7. An integrated low-loss free-space wavelength division multiplexer as claimed in claim 6, characterized in that: The sixth optical filter (16) receives the reflection signal of the fifth reflection mirror (15) and transmits the reflection signal to the third prism (17).

8. An integrated low-loss free-space wavelength division multiplexer as claimed in claim 7, characterized in that: The third prism (17) couples the signal to the fourth collimator (18).

9. An integrated low-loss free-space wavelength division multiplexer as claimed in claim 8, characterized in that: The sixth optical filter (16) receives the reflection signal of the fourth reflection mirror (14) and transmits the reflection signal to the sixth reflection mirror (19). The sixth reflector (19) is connected to a fourth prism (20) for signal reflection communication.

10. An integrated low-loss free-space wavelength division multiplexer as claimed in claim 9, characterized in that: The fourth prism (20) couples the signal to the fifth collimator (21).

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