Small-size film filter type optical add-drop multiplexing module

Abstract

The utility model relates to a wavelength division multiplexing technology, in particular to a small-size film optical filter type optical add-drop multiplexing module, which comprises a plurality of six-port devices which are divided into a first six-port device, a second six-port device and a group of third six-port devices. The number of the third six-port devices is eight, an eight-channel six-port device group is formed, and each of the first six-port devices, the second six-port devices and the third six-port devices is formed by integrating two groups of three-port devices; the first six-port device, the second six-port device and the eight-channel six-port device group are connected in sequence. The utility model aims to provide a six-port device which integrates two groups of three-port devices into one group, so that the cascade number is reduced, the volume of the whole module is reduced, the reliability and the maintainability of the whole system can be improved, and the cost is reduced at the same time.

Description

Technical Field

[0001] This utility model relates to a wavelength division multiplexing (WDM) technology, specifically a small-sized thin-film filter type optical add-drop multiplexing module. Background Technology

[0002] The technical principle of thin-film filter type FOADM (Fixed Optical Add / Drop Multiplexer) is mainly based on the interference and filtering effects of optical thin films.

[0003] Optical thin films are typically composed of multiple layers of materials with different refractive indices, each with precisely designed thickness and refractive index. When light waves pass through these thin film layers, they are reflected and transmitted at different interfaces, accompanied by phase changes. These reflected and transmitted lights interfere with each other, forming a specific spectral response.

[0004] In the operation of a FOADM, the input multi-wavelength optical signal first passes through a beam splitter to separate the different wavelengths. Then, these separated optical signals enter their respective thin-film filters. Based on preset wavelength selection characteristics, the thin-film filters reflect or transmit the target wavelength optical signal to the output port, allowing for the addition or removal of optical signals. Finally, the processed optical signals are recombined and transmitted to the next optical network node.

[0005] Traditional cascaded structures require the combination of two sets of three-port devices operating in the same frequency band. This not only increases the complexity of the equipment but also makes the entire module occupy a large space. Furthermore, to ensure that these devices function properly, a suitable enclosure is needed, which further increases the overall size of the module. Utility Model Content

[0006] The purpose of this invention is to provide a small-sized thin-film filter type optical add-drop multiplexing module to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A small-size thin-film filter type optical add-drop multiplex module includes multiple six-port devices, which are divided into a No. 1 six-port device, a No. 2 six-port device, and a group of No. 3 six-port devices;

[0009] There are a total of eight No. 3 six-port devices, forming an eight-channel six-port device group. No. 1, No. 2, and No. 3 six-port devices are all formed by integrating two groups of three-port devices.

[0010] The No. 1 six-port device, the No. 2 six-port device, and the eight-channel six-port device group are connected in sequence.

[0011] The small-size thin-film filter type optical add-drop multiplexing module described above: one end of the No. 1 six-port device has a first Tap port and a second Tap port;

[0012] The other end of the No. 1 six-port device is connected to the No. 2 six-port device, and the end of the No. 1 six-port device connected to the No. 2 six-port device also has an input port and an output port; the end of the No. 2 six-port device connected to the No. 1 six-port device is also connected by two optical fibers.

[0013] As described above, the small-size thin-film filter type optical add-drop multiplexing module has one end of the No. 3 six-port device connected to the other end of the No. 2 six-port device, and the other end of the No. 3 six-port device has a first transmission port and a second transmission port, which together form a transmission port group.

[0014] The end of the three-port device connected to the two-port device also has a first reflection port and a second reflection port, which together form a reflection port group.

[0015] As described above, in the small-size thin-film filter type optical add-drop multiplexing module: the reflection ports of two adjacent No. 3 six-port devices in the eight-channel six-port device group are connected.

[0016] The small-size thin-film filter type optical add-drop multiplexer module described above: the six-port device includes, in sequence, four connected pigtails, a self-focusing lens, a filter, and a dual-fiber collimator;

[0017] The four-fiber tail is integrated into one end of a large glass tube via a small glass tube, and the other end of the large glass tube is integrated and fixed with the dual-fiber collimator.

[0018] As described above, in the small-size thin-film filter type optical add-drop multiplexing module: one end of the four-fiber tail forms two light-inlet ends and two light-return ends, and one end of the dual-fiber collimator forms two light-transmitting ends.

[0019] The small-size thin-film filter type optical add-drop multiplexer module described above: the four-fiber pigtail integrates four channels, corresponding to two light input ends and two light return ends respectively.

[0020] Compared with the prior art, the beneficial effects of this utility model are: the purpose of this utility model is to provide a six-port device that integrates two sets of three-port devices into one set, reducing the number of cascades, thereby reducing the size of the entire module, and also improving the reliability and maintainability of the entire system, while reducing costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a small-sized thin-film filter type optical add-drop multiplex module.

[0022] Figure 2 This is a schematic diagram of the structure of a six-port device in a small-size thin-film filter type optical add-drop multiplexing module.

[0023] Figure 3 This is a schematic diagram of the structure of a four-fiber pigtail in a six-port device.

[0024] Figure 4 This is a cross-sectional view of the four-fiber pigtail in a six-port device.

[0025] In the diagram: 1-Six-port device; 101-Four-fiber pigtail; 102-Small glass tube; 103-Self-focusing lens; 104-Filter; 105-Dual-fiber collimator; 106-Large glass tube;

[0026] 2- No. 2 six-port device;

[0027] 3-Three-port six-port device. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] Please see Figures 1-4 As an embodiment of the present invention, the small-size thin-film filter type optical add-drop multiplex module includes multiple six-port devices, which are divided into a No. 1 six-port device 1, a No. 2 six-port device 2, and a group of No. 3 six-port devices 3.

[0030] There are eight of the three six-port devices 3, forming an eight-channel six-port device group. The six-port device 1, the six-port device 2, and the six-port device 3 are all formed by integrating two groups of three-port devices.

[0031] The No. 1 six-port device, the No. 2 six-port device, and the eight-channel six-port device group are connected in sequence.

[0032] In this embodiment, two sets of three-port devices are integrated into one set of six-port devices, reducing the number of cascaded devices, thereby reducing the size of the entire module, improving the reliability and maintainability of the entire system, and reducing costs.

[0033] As a further embodiment of this utility model, one end of the No. 1 six-port device 1 has a first Tap port and a second Tap port; wherein, the Tap port is a Traffic Access Point port.

[0034] The other end of the No. 1 six-port device 1 is connected to the No. 2 six-port device 2, and the end of the No. 1 six-port device 1 connected to the No. 2 six-port device 2 also has an input port and an output port; the end of the No. 2 six-port device 2 connected to the No. 1 six-port device 1 is also connected by two optical fibers.

[0035] In this embodiment, the optical signal can enter from the input port and eventually be output from the first Tap port; while when the optical signal is input from the eight-channel six-port device group, the optical signal can also be output from the output port.

[0036] As a further embodiment of this utility model, one end of the No. 3 six-port device 3 is connected to the other end of the No. 2 six-port device 2, and the other end of the No. 3 six-port device 3 has a first transmission port and a second transmission port, and the first transmission port and the second transmission port form a transmission port group.

[0037] The end of the three-port device 3 connected to the two-port device 2 also has a first reflection port and a second reflection port, and the first reflection port and the second reflection port form a reflection port group.

[0038] In this embodiment, when an optical signal is input from the second transmission port of any three six-port device 3 in the eight-channel six-port device group, it can eventually be output from the output port.

[0039] As a further embodiment of this invention, the reflection ports of two adjacent No. 3 six-port devices 3 in the eight-channel six-port device group are connected.

[0040] In this embodiment, when an optical signal enters the No. 3 six-port device 3 but cannot be output from the transmission port group, since the reflection port groups of two adjacent No. 3 six-port devices 3 are connected, the optical signal will be transmitted from one of the reflection ports of the current No. 3 six-port device 3 to the reflection port of the next No. 3 six-port device 3 to enter the next No. 3 six-port device 3; if the next No. 3 six-port device 3 still cannot transmit and output, it will be reflected to the next No. 3 six-port device 3, and so on, until the optical signal is output from one of the transmission ports.

[0041] As a further embodiment of this utility model, the six-port device sequentially includes a four-fiber pigtail 101, a self-focusing lens 103, a filter 104, and a two-fiber collimator 105 connected together.

[0042] The four-fiber tail 101 is integrated into one end of a large glass tube 106 via a small glass tube 102, and the other end of the large glass tube 106 is integrated and fixed with the dual-fiber collimator 105.

[0043] In this embodiment, the optical signal can be input from one end of the four-fiber pigtail 101, the transmitted optical signal is output from one end of the two-fiber collimator 105, and the reflected optical signal is reflected back to the initial incident end of the four-fiber pigtail 101.

[0044] As a further embodiment of this utility model, one end of the four-fiber tail 101 forms two light-inlet ends and two light-return ends, and one end of the dual-fiber collimator 105 forms two transmission ends.

[0045] In this embodiment, after the optical signal is introduced from one of the light input ends, the transmitted optical signal is exported from the transmission end, while the reflected optical signal is returned and output from the return end.

[0046] As a further improvement of this utility model, the four-fiber pigtail 101 integrates four channels, corresponding to two light input ends and two return ends respectively.

[0047] In this embodiment, the four channels are independent of each other and do not interfere with each other, so they can transmit optical signals relatively accurately without causing interference.

[0048] The above embodiments are exemplary and not restrictive. Therefore, without departing from the spirit or basic characteristics of this utility model, any technical solutions that can be implemented in other specific forms are included in this utility model.

Claims

1. A small form factor thin film filter type optical add-drop multiplexing module comprising a plurality of six port devices, characterized in that, The plurality of six-port devices are divided into a first six-port device (1), a second six-port device (2), and a group of third six-port devices (3); The third six-port devices (3) are eight in total, forming an eight-channel six-port device group, and the first six-port device (1), the second six-port device (2), and the third six-port devices (3) are all formed by integrating two groups of three-port devices; The first six-port device (1), the second six-port device (2), and the eight-channel six-port device group are sequentially connected.

2. The small size thin film filter type optical add-drop multiplexing module according to claim 1, wherein One end of the first six-port device (1) has a first Tap port and a second Tap port; The other end of the first six-port device (1) is connected to the second six-port device (2), and the end of the first six-port device (1) connected to the second six-port device (2) also has an input port and an output port; the end of the second six-port device (2) connected to the first six-port device (1) is also fused by two optical fibers.

3. A small form factor thin film filter type optical add / drop multiplexer module according to claim 2, wherein, One end of the third six-port device (3) is connected to the other end of the second six-port device (2), and the other end of the third six-port device (3) has a first transmission port and a second transmission port, which form a transmission port group; The end of the third six-port device (3) connected to the second six-port device (2) also has a first reflection port and a second reflection port, which form a reflection port group.

4. The small form factor thin optical interleaver module of claim 3, wherein, The reflection port groups of two adjacent third six-port devices (3) in the eight-channel six-port device group are connected.

5. The small form factor thin optical interleaver module of claim 1, wherein, The six-port device sequentially includes a connected four-fiber pigtail (101), a self-focusing lens (103), a filter (104), and a double-fiber collimator (105); The outside of the four-fiber pigtail (101) is integrated by a small glass tube (102) at one end of a large glass tube (106), and the other end of the large glass tube (106) is integrated and fixed with the double-fiber collimator (105).

6. A small form factor thin film filter type optical add / drop multiplexer module according to claim 5, wherein, One end of the four-fiber pigtail (101) forms two light input ends and two return ends, and one end of the double-fiber collimator (105) forms two transmission ends.

7. A small form factor thin film filter type optical add / drop multiplexer module according to claim 6, wherein The four-fiber pigtail (101) has four channels integrated inside, corresponding to the two light input ends and the two return ends. The four-fiber pigtail (101) has four channels integrated inside, corresponding to the two light input ends and the two return ends.

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