TWI469544B - Multi - wave channel thin film filter - type wavelength multiplexing and multi - processor - Google Patents

Description

Multi-channel thin film filter type wavelength multiplexing and demultiplexer

The invention relates to a wavelength multiplexing and demultiplexing device, in particular to a thin film filter type wavelength multiplexing and demultiplexing device applied to a split-wave multiplexing passive optical network.

With the rapid growth of the global Internet, the services provided by network operators are becoming more and more diverse, and the demand for integrated three-in-one multimedia information transmission of voice, data and video is increasing rapidly. The old broadband access network ADSL and Cable Modem cannot meet the three-in-one multimedia information needs. The Wavelength division multiplexing passive optical network (WDM-PON) technology uses a specific wavelength to carry information for individual Optical Networks Units (ONUs) to implement fiber to the home. FTTH) and the best way to address increased bandwidth requirements.

The most basic of the optical communication passive components and modules used in WDM-PON is the wavelength multiplexing and demultiplexer. Its function is to combine different wavelengths of light into the same fiber (multiplex) or separate into different fibers. (Solution multiplex). In order to increase the capacity of WDM-PON transmission, the channel spacing of the wavelengths used is smaller (100 GHz or even 50 GHz), so narrow-band, flat-top and steep-skirt are required. Filters are capable of this multiplex and multiplex task. There are a variety of techniques available for making such wavelength multiplexing and demultiplexing multiplexers, including thin film filters, all-fiber components, arrayed optical waveguide components, and diffraction gratings. Among them, the thin-film filter type wavelength multiplexing and demultiplexing device has a simple structure, has less influence on the temperature environment (0~70 °C), does not need temperature control, and has low mature cost of the process technology, and is currently the most suitable for low cost. Optical used in WDM-PON element.

The thin-film filter-type wavelength multiplexing and demultiplexer are designed according to the wavelength design of a thin film filter formed by laminating a desired thin film layer on a glass sheet. Generally, the light is in a material having a different refractive index. Reflection occurs at the interface. The size of the reflection depends on the difference in refractive index. The effect of multiple reflection and multiple interference can be designed to allow only a certain wavelength of light to pass through and reflect other wavelengths. Figure 1 shows the structure of a wavelength filter multiplexer and demultiplexer for a thin film filter. When incident light with multiple wavelengths is concentrated by an optical lens from the input end of the fiber connector A, it is approximated by parallel rays. The thin film filter type wavelength multiplexer and the core portion of the multiplexer are a thin film filter group, and the thin film filter group is composed of a plurality of thin film filters in a spatially appropriate configuration. The incident light is divided into two paths on the thin film filter, and most of the light corresponding to the central wavelength of the thin film filter is output from the output end channel 1 through the splitting wavelength λ1, and the remaining non-central wavelength light will be reflected and then self-optical. The lens converges into approximately parallel rays, and then enters another film filter to separate the wavelength λ2 from the output channel 2, so that all wavelengths can be separated by repeated, and the separated wavelengths are respectively corresponding to the corresponding fiber connectors. The output of group B is output externally, and the above is a demultiplexing multiplexer. According to the reversible principle of the optical path, when the respective output ends respectively input light of individual wavelengths, the original input end can output multi-wavelength multiplexed light to complete the multiplex procedure.

WDM-PON uses a pair of different wavelengths (λT, λR) for each client to transmit and receive the uplink and downlink signals as shown in Figure 2. When using conventional thin-film filter wavelength multiplexing and solution For the multiplexing and demultiplexing of the wavelength, since the output of each channel can only pass one wavelength, it is necessary to provide two channels and use two optical fibers to enable each user to simultaneously go up and down. The transmission and reception of signals will not only cause the cost of fiber laying, but also the subsequent maintenance of the fiber. It is not a good design and needs to be improved. Nai After thinking and improving, and after years of painstaking research, I finally successfully developed this multi-channel thin film filter wavelength multiplexer and demultiplexer, using the band divider and the thin film filter set to be incident from the input end. Multi-wavelength light is divided and separated according to its frequency band and wavelength, and then recombined by optical coupler, so that each channel of the output can pass more than one wavelength to conform to the application of WDM-PON, and can also save fiber. The number of uses and ease of subsequent maintenance and management.

The main object of the present invention is to provide a low-cost and easy-to-use multi-channel thin film filter type wavelength multiplexing and demultiplexer, which can be applied to WDM-PON system wavelength multiplexing and demultiplexing components. Each channel can pass more than one wavelength to save the number of fiber use and facilitate the maintenance and management of subsequent systems.

A multi-channel thin film filter type wavelength multiplexing and demultiplexer capable of achieving the above object, comprising a band divider, an optical lens, a thin film filter set, and an optical coupler. By appropriate component configuration, the incident multi-wavelength light is band-divided and wavelength-separated and then recombined, so that each output channel can pass more than two wavelengths for application on the WDM-PON system. Perform wavelength multiplex and demultiplexing procedures. The band splitter is located at the input end of the wavelength multiplexing and demultiplexer, and the optical lens is connected in the middle so that the incident light of multiple wavelengths is focused on the band splitter for band splitting, and the plurality of sets of thin film filter sets are separated according to the wavelength thereof. The frequency bands are respectively located after the optical path of the frequency band divided by the band divider, and the optical lens is connected to perform focusing, and the band-divided light enters the associated thin film filter group and then separates the individual wavelengths, and the film filter sets of different frequency bands are separated. The channel is connected to each other by a plurality of optical couplers, and the optical coupler is used to combine the light of a single wavelength separated from the film filter sets of different frequency bands, and then each optical coupler The output end can be used as a wavelength multiplexing and demultiplexer to complete the wavelength demultiplexing program output channel. In this architecture, each channel of the multi-channel thin film filter wavelength multiplexing and demultiplexer can be reached. The purpose of passing two or more wavelengths.

In summary, the present invention can be summarized as follows: a multi-channel channel thin film filter type wavelength multiplexing and demultiplexer, which is applied to a wavelength multiplexing and demultiplexing program of a split-wave multiplexing passive network, which includes: An optical lens; a band divider disposed behind the optical lens to divide incident light focused through the optical lens; a band of thin film filter sets, the divided incident light is received to separate individual wavelengths; And a plurality of optical couplers, which receive and combine the light of each single wavelength separated by the thin film filter group of the frequency band; wherein the demultiplexing process is that the multi-wavelength incident light is focused on the frequency band by the optical lens The frequency division is performed in the device, and the spectrally divided light is separated from the individual wavelengths by the thin film filter group of the frequency band of the frequency band, and the separated wavelength light is connected to each other by a plurality of optical couplers, and the plurality of optical couplers are connected by using the plurality of optical couplers. Combining light from a single wavelength separated by different sets of thin film filters in the band, so that each channel at the output can pass more than one wavelength With the multiplexed programs which are constituent elements having the optical path to achieve reversibility.

In the present invention, the band splitter is a C/L band splitter that directs light of multiple wavelengths in the upper and lower transmission bands, respectively.

In the present invention, the band thin film filter set is a combination of a C-band thin film filter set and an L-band thin film filter set, respectively performing photolysis multiplexing on a downlink C-band multi-wavelength Program and optical multiplexing procedure for upstream L-band multi-wavelength.

In the present invention, wherein the plurality of optical couplers are 1 X 2 optical couplers, respectively combining light from a single wavelength separated from the C-band thin film filter group and the L-band thin film filter set Together.

In the present invention, the plurality of optical couplers are output/input channels of a multi-channel thin film filter type wavelength multiplexing and demultiplexing device, and each channel can be used for uplink and downlink. The wavelength passes.

In the present invention, the band splitter is a combination of a U/C-L band splitter and a C/L band splitter, and respectively guides monitoring and transmitting light of multiple wavelengths in the upper and lower transmission bands.

In the present invention, the band thin film filter set is a combination of a U-band thin film filter set, a C-band thin film filter set and an L-band thin film filter set, and the monitoring is performed separately. Optical multiplexing and demultiplexing procedures for wavelengths, optical demultiplexing procedures for downstream C-band multi-wavelengths, and optical multiplexing procedures for upstream L-band multi-wavelengths.

In the present invention, wherein the plurality of optical couplers are 1×3 optical couplers, respectively combining the single-wavelength light separated from the U-band, C-band and L-band thin film filter sets. Together.

In the present invention, the plurality of optical couplers are output channels of a multi-channel thin film filter type wavelength multiplexing and demultiplexer, each of which can achieve monitoring, uplink and downlink. Use wavelength to pass.

The invention is a multi-wave channel thin film filter type wavelength multiplexing and demultiplexing device, and has the following advantages when compared with the above cited cases and other conventional techniques:

1. The present invention is a multi-wave channel thin film filter type wavelength multiplexing and demultiplexer, which divides and separates multiple wavelengths of light through a band divider and a thin film filter group according to their frequency bands and wavelengths, respectively. The combination is given by the optical coupler so that each channel of the wavelength multiplexing and demultiplexer output can pass more than one wavelength and can be applied to the WDM-PON. Save on the number of fiber optic uses and facilitate subsequent maintenance and management.

2. The multi-channel channel filter-type wavelength multiplexer and demultiplexer provided by the present invention, each channel of the output end of the wavelength demultiplexing program can be connected to an individual user end by a single optical fiber, and a pair is used at the same time. Different wavelengths (λ _T , λ _R ) are used to transmit and receive the uplink and downlink signals to save the number of optical fibers used.

3. The multi-channel channel filter-type wavelength multiplexer and demultiplexer provided by the present invention, each channel of the output of the wavelength demultiplexing program can provide a third wavelength pass as an optical network loop Whether the monitoring wavelength of the wire is broken.

4. The multi-channel channel filter-type wavelength multiplexer and demultiplexer provided by the present invention, the wavelength number and wavelength type of light that can pass through each channel of the output end of the wavelength demultiplexing program can be Pairing and combining with each other as needed for the application.

The detailed description of the present invention is intended to be illustrative of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. In the scope of patents.

To sum up, this case is not only innovative in terms of technical thinking, but also has many of the above-mentioned functions that are not in the traditional methods of the past. It has fully complied with the statutory invention patent requirements of novelty and progressiveness, and applied for it according to law. Approved this invention patent application, in order to invent invention, to the sense of virtue.

In order to further understand the objects, structures, features and functions of the present invention, the implementation steps of the method of the present invention and its advantages are described in three embodiments. But not intended to limit the invention The scope.

At present, the most common WDM-PON architecture uses C-band wavelengths to carry signals for its downlink transmission, and uplink transmission uses L-band wavelengths to carry signals. In this architecture, each channel of the wavelength multiplex and demultiplexer located at the remote node (RN) must be able to simultaneously transmit signals through the uplink and downlink, so that it can be connected in a fiber-optic manner. The termination point and the user end, for which purpose the "multi-channel channel thin film filter type wavelength multiplexing and demultiplexer" of the present invention is used to illustrate one embodiment applied to the WDM-PON.

Please refer to FIG. 3 for explaining a first embodiment of a "multi-channel channel thin film filter type wavelength multiplexing and demultiplexer" according to the present invention.

FIG. 3 is a structural diagram of a multi-channel channel thin film filter wavelength multiplexer and demultiplexer 300. The thin film filter wavelength multiplexer and demultiplexer 300 are connected by optical fiber connectors 311-315. The optical lenses 321 to 323, the C/L band divider 331, the C-band thin film filter group 341, the L-band thin film filter group 342, and the 1x2 optical coupler 351 to 354 are main components. The method of wavelength multiplexing and multiplexing will be explained as follows: For convenience of description of the present embodiment, the number of channels of the multi-channel channel thin film filter wavelength multiplexing and demultiplexer 300 will be 4 as an example but not This is limited to this. When the incident light of the C-band multi-wavelength (λ _C1 λ _C2 λ _C3 λ _C4 ) carrying the downlink signal enters the thin film filter wavelength multiplexer and demultiplexer 300 through the fiber connector 311, the optical lens 321 is focused on The C/L band divider 331 multiplexes the C-band multi-wavelength incident light by the C/L band divider 331 to the optical lens 322, and the optical lens 322 focuses the incident light on the C-band film filter group 341. Wavelength separation of the C-band is performed. The wavelengths of the separated C-bands enter the corresponding 1x2 optical couplers 351-354 according to their paths, and then enter the corresponding fiber connectors 312-315, and the fiber connectors 312-315 serve as the output ends of the C-bands. That is, the multi-channel thin film filter type wavelength multiplexing and the multiplexer 300 wavelength demultiplexing process are completed, and the fiber connectors 312~315 are respectively connected to the respective users by optical fibers, and the downlink signals will be passed by C- The wavelength of the band is transmitted to each user. When the UE performs uplink signal transmission, the individual user uses the L-band wavelength (λ _L1 λ _L2 λ _L3 λ _L4 ) to carry the signal for uplink transmission, and the optical fiber is connected to the multi-channel thin film filter wavelength multiplexing and The multiplexer 300, the wavelength of the L-band carrying the signal (λ _L1 λ _L2 λ _L3 λ _L4 ) is input from the fiber connectors 312-315, respectively, and enters the L-band film through the corresponding 1x2 optical couplers 351-354. The filter group 342 performs wavelength combining of the L-band, and the L-band light combined into a bundle is focused by the optical lens 323 to the C/L band divider 331 and then refracted into the optical lens via the C/L band divider 331. The lens is focused by the optical lens 321 on the fiber connector 311, and the combined L-band light will be output by the fiber connector 311, that is, the multi-channel thin film filter wavelength multiplexing and the multiplexer 300 wavelength multiplexing are completed. program. At this time, each channel formed by the multi-channel channel filter-type wavelength multiplexing and the fiber connector 312-315 of the demultiplexer 300 can be connected to each user by one fiber, and the downlink C-band and the uplink L- are simultaneously performed. Bidirectional transmission of frequency bands.

Those skilled in the art will understand that the number of channels for wavelength multiplexing and demultiplexing is naturally only an example, and may require more or fewer channels for applications.

In addition to using the C-band and L-band wavelengths to carry signals for downlink and uplink transmission, the WDM-PON architecture must use the third wavelength as the monitoring wavelength to detect the optical network loop in order to ensure its transmission quality. Whether it is broken. Therefore, the wavelength multiplexing and demultiplexer channel must pass the monitoring wavelength in addition to the wavelength of the uplink and downlink signals. For this purpose, the present invention "multi-channel channel thin film filter wavelength multiplexing and solution" The second embodiment of the WDM-PON is explained in this way.

FIG. 4 is a structural diagram of a multi-wave channel thin film filter type wavelength multiplexing and demultiplexer 400. The thin film filter type wavelength multiplexing and demultiplexer 400 is composed of fiber connectors 411~414. , optical lenses 421 to 425, U/CL band divider 431, C/L band divider 432, C-band film filter group 441, L-band film filter group 442, U-band film filter Group 443 and 1x3 optocouplers 451~453 and other main components. The method of wavelength multiplexing and multiplexing will be explained as follows: For convenience of description of the present embodiment, the number of channels of the multi-channel channel thin film filter wavelength multiplexing and demultiplexer 400 will be 3 as an example but not This is limited to this. As shown in the first embodiment, the incident light of the C-band multi-wavelength (λ _C1 λ _C2 λ _C3 ) carrying the downlink signal enters the multi-channel thin film filter wavelength multiplexer and demultiplexer 400 from the fiber connector 411, The optical lens 421 is focused on the U/CL band divider 431, and the C-band multi-wavelength incident light is refracted by the U/CL band divider 431 to the optical lens 422, and the optical lens 422 focuses the incident light on the C/L. The band film filter group 432 is refraction to the optical lens 423, and the optical lens 423 focuses on the C-band film filter group 441 to perform wavelength separation of the C-band. The wavelengths of the separated C-bands enter the corresponding 1x3 optical couplers 451-453 according to their paths, and then enter the corresponding fiber connectors 412-414, and the fiber connectors 412-414 serve as the output ends of the C-bands. That is, the multi-channel thin film filter type wavelength multiplexing and the multiplexer 400 wavelength demultiplexing program are completed. The incident light of the L-band multi-wavelength (λ _L1 λ _L2 λ _L3 ) carrying the uplink signal is respectively input into the multi-channel thin film filter wavelength multiplexer and the demultiplexer 400 from the fiber connector 412-414, and the corresponding The 1x3 optical couplers 451-453 enter the L-band thin film filter set 442 for wavelength combining of the L-band, and the L-band light combined into a bundle is optically focused by the optical lens 424 to the C/L band splitter 432, and merged. The bundled L-band light is refracted to the optical lens 422 via the C/L band divider 432, and then focused by the optical lens 422 to the U/CL band divider 431, and then refracted into the optical via the U/CL band divider 431. The lens 421 is focused by the optical lens 421 on the fiber connector 411, and the L-band light combined into a bundle will be output by the fiber connector 411, that is, the multi-channel thin film filter wavelength multiplexing and the multiplexer 400 wavelength multiplexing are completed. program of. The monitoring method of the optical network is that each user end is coupled with a reflection device, and the detection light source transmitted by the central office contacts the reflection device, and the wavelengths of the respective reflections thereof are reflected back, and the reflection is utilized. The light wave provides multiple wavelengths of light for monitoring purposes. The monitoring wavelength generally selects wavelengths of different frequency bands to avoid interference with the transmission signal. Here, the U-band light is taken as the monitoring wavelength as an example, but not limited thereto. The U-band multi-wavelength (λ _M1 λ _M2 λ _M3 ) monitoring light is emitted from the central end from the fiber optic connector 411 into the multi-channel thin film filter wavelength multiplexer and demultiplexer 400, and is focused by the optical lens 421 to the U/CL. The band divider 431, the U-band multi-wavelength monitoring light will be refracted by the U/CL band divider 431 to the optical lens 425, and the optical lens 425 is focused on the U-band film filter group 443 for U-band wavelength separation. . The wavelengths of the separated U-bands enter the corresponding optical couplers 451-453 according to their paths, and then enter the corresponding fiber connectors 412-414, and the fiber connectors 412-414 serve as the output ends of the U-band monitoring lights. , transferred to the corresponding client. The light-emitting device of each user end reflects the monitoring light to return to the central office, and the monitoring light reflected by each user end follows the original optical fiber loop and then enters the multi-channel thin film filter wavelength from the optical fiber connector 412-414. The multiplexer and demultiplexer 400 enters the U-band thin film filter group 443 through the corresponding 1x3 optical couplers 451-453 to perform U-band monitoring wavelength combining, and the U-band monitoring light combined into a bundle is subjected to The optical lens 425 is focused on the U/CL band divider 431, and then refracted into the optical lens 421 via the U/CL band divider 431, and is focused by the optical lens 421 on the fiber connector 411. The combined beam of the monitoring light will be connected by the fiber connector. The 411 output returns to the central office, and the central office detects whether the entire network loop is disconnected according to the wavelength of the received reflection monitoring light and the optical power intensity. In this configuration, each of the channels formed by the fiber connectors 412 to 415 of the multi-channel channel filter-type wavelength multiplexing and demultiplexer 400 of the present invention can transmit signals C-band and L-band wavelengths. In addition, it is also possible to monitor the U-band wavelength.

The multi-channel channel filter-type wavelength multiplexing and demultiplexer of the present invention can be used as a WDM-PON, and can also be used as a wavelength multiplexing and solution that generally requires more than two wavelengths of its output channel. Used by the tool. The third embodiment of the "multi-channel channel thin film filter wavelength multiplexing and demultiplexer" will be explained.

FIG. 5 is a structural diagram of a multi-wave channel thin film filter wavelength multiplexer and demultiplexer 500, which contains multiple wavelengths of light (λ ₁ λ ₂ λ ₃ λ ₄ λ ₅ λ ₆ λ ₇ λ ₈ ) The fiber optic connector 511 enters the thin film filter type wavelength multiplexing and demultiplexer 500, and is focused by the optical lens 521 on the band film filter group 541, and the individual wavelengths are separated by the band film filter group 541. The separated wavelengths can be paired with each other according to the design, and the paired lights are combined by the optical couplers 551-554, and finally outputted to the output ends of the individual channels via the corresponding fiber connectors 512-515. In the example, the number of wavelengths of the multi-wavelength light and the manner in which the wavelengths are paired with each other are merely examples for convenience of explanation, and the number of wavelengths may be arbitrarily combined by design depending on the manner in which the application needs to include more or less numbers and wavelength pairing.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; the modifications and equivalents of the present invention are intended to be included in the scope of the present invention without departing from the spirit and scope of the invention. Within the scope of protection.

300‧‧‧Multiwave channel thin film filter wavelength multiplexer and multiplexer

311~315‧‧‧Optical connector

321~323‧‧‧ optical lens

331‧‧‧C/L Band Splitter

341‧‧‧C-band thin film filter set

342‧‧‧L-band thin film filter set

351~354‧‧1x2 optocoupler

400‧‧‧Multiwave channel thin film filter wavelength multiplexer and multiplexer

411~414‧‧‧Fiber Optic Connector

421~425‧‧‧ optical lens

431‧‧‧U/C-L Band Splitter

432‧‧‧C/L Band Splitter

441‧‧‧C-band thin film filter set

442‧‧‧L-band thin film filter set

443‧‧‧U-band thin film filter set

451~453‧‧1x3 optocoupler

500‧‧‧Multiwave channel thin film filter wavelength multiplexer and multiplexer

511~515‧‧‧Fiber Optic Connector

521‧‧‧ optical lens

541‧‧‧ Band Thin Film Filter Set

551~554‧‧‧Optocoupler

Figure 1 is a schematic diagram of a conventional wavelength filter multiplexer and demultiplexer architecture; Figure 2 is a remote connection between the WDM-PON and the user, each user uses a different wavelength For the transmission and reception architecture diagram of the signal; FIG. 3 is a schematic diagram of the multi-channel channel filter-type wavelength multiplexing and demultiplexing device of the first embodiment of the present invention and the path of the signal light wave; FIG. 4 is The architecture diagram of the multi-channel channel filter-type wavelength multiplexing and demultiplexer of the second embodiment of the present invention and the path of the signal light wave; FIG. 5 is a multi-channel channel membrane filter of the third embodiment of the present invention. Optical chip type wavelength multiplexing and demultiplexer architecture diagram and signal light wave path;

300‧‧‧Multiwave channel thin film filter wavelength multiplexer and multiplexer

311~315‧‧‧Optical connector

321~323‧‧‧ optical lens

331‧‧‧C/L Band Splitter

341‧‧‧C-band thin film filter set

342‧‧‧L-band thin film filter set

351~354‧‧1x2 optocoupler

Claims (9)

A multi-channel thin film filter type wavelength multiplexing and demultiplexing device is applied to a wavelength multiplexing and demultiplexing program of a split-wave multiplexing passive network, comprising: an optical lens; a band splitter placed Behind the optical lens, the incident light focused by the optical lens is divided; the one-band thin film filter group receives the divided incident light to separate the individual wavelengths; and the plurality of optical couplers receive the thin film Each of the single wavelengths of light separated by the filter set is combined; wherein the multiplexed program is a multi-wavelength incident light that is focused by the optical lens in the band divider for band division, and the spectrally split light is The individual wavelengths are separated by the thin film filter group of the frequency band of the frequency band, and the separated wavelengths are connected to each other by a plurality of optical couplers, and the plurality of optical couplers are used to separate the thin film filter groups from the different frequency bands. The separated single wavelengths of light are combined so that each channel of the output can pass more than one wavelength, and the multiplexed program is composed of the components Reversibility of the light path to achieve. For example, the multi-channel thin film filter type wavelength multiplexing and demultiplexing device described in claim 1 wherein the band splitter is a C/L band splitter, respectively guiding the uplink and downlink transmission bands. Wavelength of light. The multi-channel thin film filter wavelength multiplexer and demultiplexer according to claim 2, wherein the band of the thin film filter is a C-band thin film filter group and an L-band film. a combination of filter sets, respectively performing a photo-demultiplexing process on the downstream C-band multi-wavelength and on the upper An L-band multi-wavelength optical multiplexing program. The multi-channel thin film filter wavelength multiplexer and demultiplexer according to claim 3, wherein the plurality of optical couplers are 1 X 2 optical couplers, respectively, from the C-band film The filter set is combined with a single wavelength of light separated by the L-band film filter set. The multi-channel thin film filter type wavelength multiplexing and demultiplexing device as described in claim 4, wherein the plurality of optical couplers are multi-channel thin film filter type wavelength multiplexing and solving multiple The output/input channel of the device can be used to pass the wavelengths used for the uplink and downlink. The multi-channel thin film filter wavelength multiplexer and demultiplexer according to claim 1, wherein the band splitter is a combination of a U/CL band splitter and a C/L band splitter. Monitor and transmit multiple wavelengths of light in the upper and lower transmission bands, respectively. The multi-channel thin film filter wavelength multiplexer and demultiplexer according to claim 6, wherein the band of the thin film filter is a U-band thin film filter group and a C-band film. The combination of the filter group and the L-band thin film filter group respectively performs optical multiplexing and demultiplexing procedures for monitoring multiple wavelengths, photo-multiplexing procedures for downlink C-band multi-wavelength, and uplink L-bands Multi-wavelength optical multiplexing program. The multi-channel thin film filter type wavelength multiplexing and demultiplexer according to claim 7, wherein the plurality of optical couplers are 1 X 3 optical couplers, respectively, from the U-band, The C-band and the L-band thin film filter set are separated by a single wavelength of light. The multi-channel thin film filter type wavelength multiplexing and demultiplexing device as described in claim 8 wherein the plurality of optical couplers are multi-channel thin film filter type wavelength multiplexing and solving multiple The output/input channel of the tool can be used for monitoring, uplink and downlink Use wavelength to pass.