Wavelength division device and manufacturing method thereof

Abstract

The invention provides a wavelength division device and a manufacturing method thereof. The wavelength division device includes a substrate having one or more grooves, a plurality of filter strips disposed in the one or more grooves of the substrate, and a prism disposed on the substrate. Each of the plurality of filter strips corresponds to an optical filter wavelength. The prism is configured to cover the plurality of filter strips. The surface of the substrate is etched to form one or more recesses. After the plurality of filter strips are coated, the plurality of filter strips are bonded within the one or more grooves of the substrate. The resin disposed on the substrate is imprinted by the working mold to form a prism.

Description

Wavelength division multiplexing device and its manufacturing method Technical Field

[0001] This invention describes a wavelength division multiplexing (WDM) device and its manufacturing method, and particularly relates to a WDM device and its manufacturing method that can improve the alignment accuracy of filters and reduce the bonding alignment process. Background Technology

[0002] Wavelength Division Multiplexing (WDM) is a technique that uses several lasers to simultaneously transmit multiple laser beams of different wavelengths over a single optical fiber. WDM can be used to transmit each beam separately or to combine beams of several wavelengths together for transmission. Local Area Network WDM (LWDM) is a WDM technology based on Ethernet channels. It uses 12 wavelengths from 1269 nm to 1332 nm in the O-band (1260 nm to 1360 nm), with a wavelength spacing of 4 nm. LWDM operating wavelengths are characterized by low dispersion and good stability. At the same time, LWDM can increase channel capacity and further save fiber utilization.

[0003] Traditional multiplexer and demultiplexer concepts utilize parallelogram structures and filters to combine beams of different wavelengths and transmit them into optical fibers. Filters are assembled through bonding. An alternative method is to use a lift-off technique in the filter coating process. However, using a lift-off process makes achieving the desired coating quality for the four channels of an LWDM very difficult. Summary of the Invention

[0004] The purpose of this invention is to provide a wavelength division multiplexing (WDM) device and its manufacturing method to solve at least one of the above-mentioned problems.

[0005] One embodiment of the present invention discloses a wavelength division multiplexing (WDM) device. The WDM device includes a substrate with grooves, a plurality of filter strips disposed in the grooves of the substrate, and a prism disposed on the substrate. Each of the plurality of filter strips corresponds to an optical filtering wavelength. The prism is configured to cover the plurality of filter strips. The surface of the substrate is etched to form grooves. After the plurality of filter strips are coated, the plurality of filter strips are bonded into the grooves of the substrate. Resin disposed on the substrate is pressed into the prism by a working mold.

[0006] Another embodiment of the present invention discloses a method for manufacturing a wavelength division multiplexing (WDM) device. The method includes: etching the surface of a substrate to form a groove; coating a plurality of filter strips; after the plurality of filter strips are coated, bonding the plurality of filter strips into the grooves of the substrate; and pressing resin disposed on the substrate using a working die to form a prism. Each of the plurality of filter strips corresponds to an optical filtering wavelength. The prism is disposed on the substrate and configured to cover the plurality of filter strips.

[0007] The beneficial effect of this invention lies in that it discloses a wavelength division multiplexing (WDM) device and its manufacturing method. The WDM device includes a substrate with etched grooves to accommodate multiple filter strips. Prisms are formed by imprinting resin onto the substrate to cover the filter strips. The manufacturing method of this invention simplifies the assembly process by pre-defining the positions of the filter strips within the grooves, thereby producing a more compact and robust optical assembly, thus suitable for various applications in optical communication. Attached Figure Description

[0008] Figure 1 is a structural diagram of an embodiment of the wavelength division multiplexing (WDM) device of the present invention.

[0009] Figure 2 shows the first stage of manufacturing the wavelength division multiplexing (WDM) device of Figure 1.

[0010] Figure 3 shows the second stage of manufacturing the wavelength division multiplexing (WDM) device of Figure 1.

[0011] Figure 4 shows the third stage of manufacturing the wavelength division multiplexing (WDM) device of Figure 1.

[0012] Figure 5 shows the fourth stage of manufacturing the wavelength division multiplexing (WDM) device of Figure 1.

[0013] Figure 6 shows the fifth stage of manufacturing the wavelength division multiplexing (WDM) device of Figure 1.

[0014] Figure 7 shows the sixth stage of manufacturing the wavelength division multiplexing (WDM) device of Figure 1.

[0015] Figure 8 shows multiple optical paths that perform multiplexing by the wavelength division multiplexing device in Figure 1.

[0016] Figure 9 shows multiple optical paths through which the wavelength division multiplexing device of Figure 1 performs the demultiplexing mechanism.

[0017] Figure 10 shows the coating technique of the substrate of the wavelength division multiplexing device in Figure 1 when the multiplexing mechanism is performed.

[0018] Figure 11 shows the coating technique of the substrate of the wavelength division multiplexing device in Figure 1 when the demultiplexing mechanism is performed.

[0019] Figure 12 is a flowchart of manufacturing the wavelength division multiplexing (WDM) device shown in Figure 1.

[0020] The attached figures are labeled as follows:

[0021] 100: Wavelength Division Multiplexing (WDM) device

[0022] 10: Substrate

[0023] 10a: Groove

[0024] 11: Prism

[0025] 12: Nozzle

[0026] 20: Resin

[0027] 30: Working mold

[0028] 30a: Pre-ordered pattern

[0029] 40: Lens

[0030] D: Depth

[0031] W: Width

[0032] FB1 to FB4: Filter strips

[0033] P1: First surface

[0034] P2: Second surface

[0035] P3: Third Surface

[0036] L11 to L14: Optical signals

[0037] L21 to L24: Reflected light signals

[0038] R11 to R14: Reflected light signals

[0039] R21 to R24: Filtered optical signals

[0040] F11 to F13: Optical signals

[0041] F21 to F23: Optical signals

[0042] L_com1, L_com2: Composite optical signals

[0043] S1201 to S1204: Steps Detailed Implementation

[0044] Figure 1 is a structural diagram of an embodiment of the wavelength division multiplexing (WDM) device 100 of the present invention. The WDM device 100 can be a wavelength division multiplexer or wavelength division demultiplexer, which allows multiple optical signals with different wavelengths to be transmitted simultaneously on a single optical fiber. The WDM device 100 includes a substrate 10, a plurality of filter strips FB1 to FB4, and a prism 11. The substrate 10 can be a substrate material for mounting other components. In this embodiment, the substrate 10 can be a glass wafer having a plurality of etched grooves. The plurality of filter strips FB1 to FB4 are disposed in one or more grooves of the substrate 10. Each of the plurality of filter strips FB1 to FB4 corresponds to an optical filtering wavelength. Here, the filter strips can selectively allow only light of a specific optical wavelength to pass through, while blocking or reflecting other wavelengths. The specific optical wavelength can be selected from the O-band (1260 nanometers (nm) to 1360 nm). The prism 11 is disposed on the substrate 10 and configured to cover the plurality of filter strips FB1 to FB4. In this embodiment, the prism 11 may be a triangular block of resin or other transparent material that refracts (or reflects) light. In the wavelength division multiplexing (WDM) device 100, the surface of the substrate 10 is etched to form one or more grooves. After multiple filter strips FB1 to FB4 are coated, the multiple filter strips FB1 to FB4 may be bonded into one or more grooves of the substrate 10. Furthermore, the resin disposed on the substrate 10 may be imprinted by a working mold 30 to form the prism 11. Details of manufacturing the WDM device 100 are described below.

[0045] Figure 2 illustrates the first stage of fabricating the wavelength division multiplexing (WDM) device 100. As previously described, the substrate 10 has one or more grooves 10a. In one embodiment, the one or more grooves 10a can be created on a glass wafer substrate using a "dry etching" technique. The substrate 10 can be a glass wafer. For example, a photomask can be applied to the surface of the glass wafer, defining the pattern of the grooves 10a to be etched. The photomask material is resistant to etchants, protecting the area beneath it while allowing the exposed areas to be etched. The glass wafer is then placed in a dry etching chamber where plasma is generated. Here, the plasma is a highly ionized gas containing ions, electrons, and neutral atoms. Ions in the plasma bombard the exposed areas of the glass wafer, physically or chemically removing material, thereby creating one or more grooves 10a. After etching, the photomask can be removed using a suitable solvent or stripping process. In the WDM device 100, the one or more grooves 10a have substantially the same depth and substantially the same width. For example, the depth D of the groove can be 10 micrometers, and the width W of the groove can be 125 micrometers. In Figure 2, the substrate 10 can be a glass substrate with an array of precise grooves 10a. These grooves 10a provide designated positions for placing filter strips FB1 to FB4, ensuring precise alignment and spacing within the wavelength division multiplexing (WDM) device 100.

[0046] Figure 3 illustrates the second stage of manufacturing the wavelength division multiplexing (WDM) device 100. Here, each of the filter strips FB1 to FB4 is individually coated with a specific “glass coating liquid material,” meaning that each filter strip has an independent coating process to allow for precise control over the optical properties of each filter. The primary function of the coating is to create a wavelength-selective filter. By changing the composition of the coating material, each filter strip can be tuned to transmit a specific wavelength band while reflecting or absorbing other wavelength bands. The multiple filter strips FB1 to FB4 can then be bonded to one or more recesses 10a of the substrate 10 using an adhesive material with a refractive index matching that of the glass. For example, in Figure 3, a specialized automated pick-and-place (PnP) machine (such as nozzle 12) is used. The PnP machine can accurately identify and position individual filter strips from the source (such as a glass wafer). This ensures that the correct filter strip is selected for each recess 10a. The PnP (Plug and Play) assembly can precisely align individual filter strips (such as filter strip FB3) with corresponding grooves 10a on the substrate 10. Once aligned, filter strips FB1 to FB4 can be bonded into the grooves 10a of the substrate 10. For example, a small amount of adhesive can be applied to the bottom of the grooves 10a or the filter strips FB1 to FB4 before placement. The adhesive can be ultraviolet (UV) cured epoxy resin or a thermally conductive material to ensure strong adhesion and heat dissipation. Since the grooves 10a can be used to position the filter strips FB1 to FB4 bonded to the substrate 10, precise placement and strong adhesion of the filter strips are ensured, which is crucial for achieving the desired optical filtering characteristics and overall device functionality.

[0047] Figure 4 illustrates the third stage of manufacturing the wavelength division multiplexing (WDM) device 100. After multiple filter strips FB1 to FB4 are bonded into one or more grooves 10a of the substrate 10, the substrate 10 is treated by a thermosetting process to heat the adhesive material located between the multiple filter strips FB1 to FB4 and the one or more grooves 10a, or by a UV curing process to change the adhesive material from a liquid state to a hardened state. After the thermosetting or UV curing process is completed, as shown in Figure 4, resin 20 is disposed on the substrate 10 and configured to cover the multiple filter strips FB1 to FB4. In this embodiment, resin 20 may be highly transparent to allow light to pass through with minimal loss or distortion. Furthermore, resin 20 needs to have a viscosity suitable for the imprinting process. Its fluidity should be sufficient to flow into the mold cavity and conform to the prism shape, but not so thin that it diffuses uncontrollably. Resin 20 is curable, capable of changing from a liquid to a solid state. This can be achieved by UV curing, thermosetting, or other methods. The curing process produces a stable, solid-state prism structure. In this embodiment, resin 20 may be epoxy resin.

[0048] Figure 5 illustrates the fourth stage of manufacturing the wavelength division multiplexing (WDM) device 100. Figure 6 illustrates the fifth stage of manufacturing the WDM device 100. In Figure 5, a working mold 30 with a predetermined pattern 30a corresponding to the desired prism shape is selected. Specifically, the working mold 30 has a cavity with a shape opposite to that of the prism 11. The working mold 30 is then carefully positioned over the resin 20 (liquid) on the substrate 10 to ensure proper alignment, thereby achieving the desired prism orientation and position. After the working mold 30 is positioned, it can be pressed against the resin 20 with a controlled force for a duration to form the prism 11. The controlled force should be sufficient to ensure that the resin 20 completely fills the working mold cavity and conforms to the prism shape. In Figure 6, the controlled force (or pressure) is maintained for a duration to allow the resin 20 to fully conform to the shape of the working mold 30. This duration depends on the properties of the resin and the desired prism size. In this embodiment, if the resin 20 requires a curing process, the component in Figure 6 can be exposed to a suitable curing method, such as UV curing, thermal curing, or other curing methods. In Figure 6, ensuring that the resin 20 is fully cured is crucial for achieving the desired mechanical and optical properties of the prism 11.

[0049] Figure 7 illustrates the sixth stage of manufacturing the wavelength division multiplexing (WDM) device 100. After the resin 20 is imprinted and cured, the working mold 30 can be removed from the substrate 10. In one embodiment, a release agent may be applied to the working mold 30 before the imprinting process to facilitate demolding. The release agent can form a thin layer between the working mold 30 and the resin 20 to reduce adhesion and make it easier to separate. Furthermore, the demolding process may include applying a controlled force to separate the working mold 30 from the curing resin 20. The controlled force should be sufficient to overcome the adhesive forces between the working mold 30 and the resin 20, but not high enough to damage the prism 11 or the substrate 10. After the working mold 30 is removed from the substrate 10, the substrate 10 can be sawn to adjust the dimensions of the WDM device 100. Finally, the WDM device 100 is fully manufactured.

[0050] Figure 8 illustrates the optical path of the multiplexing mechanism performed by the wavelength division multiplexing (WDM) device 100. The WDM device 100 can be a wavelength division multiplexer. In other words, the WDM device 100 can simultaneously transmit multiple optical signals on a single optical fiber using lasers of different wavelengths. Each optical signal carries its specific wavelength. The wavelength division multiplexer allows multiple optical signals to be combined and transmitted together without interference. In Figure 8, the prism 11 of the WDM device 100 includes a first surface P1, a second surface P2, and a third surface P3. The first surface P1 is configured to receive multiple optical signals L11 to L14 having multiple optical wavelengths. The second surface P2 is disposed on one side of the first surface P1 and is configured to reflect the multiple optical signals to generate multiple reflected optical signals. For example, optical signals L11 to L14 can be reflected by the second surface P2 to generate reflected optical signals R11 to R14, respectively. The third surface P3 is disposed on one side of the first surface P1 and the second surface P2 and is configured to receive multiple reflected optical signals R11 to R14. Then, multiple reflected light signals R11 to R14 are received by multiple filter strips FB1 to FB4 via the third surface P3 of prism 11. Furthermore, the multiple reflected light signals R11 to R14 are multiplexed by substrate 10 to generate a composite light signal. Details are as follows: Light signal F11 is generated by filtering the reflected light signal R11. When the reflected light signal R11 passes through filter strip FB4, light signal F11 is the reflected light signal R11. Then, light signal F11 can be reflected by substrate 10 and combined with reflected light signal R12 to generate light signal F12 when reflected light signal R12 passes through filter strip FB3. Then, light signal F12 can be reflected by substrate 10 and combined with reflected light signal R13 to generate light signal F13 when reflected light signal R13 passes through filter strip FB2. Then, light signal F13 can be reflected by substrate 10 and combined with reflected light signal R14 to generate light signal L_com1 when reflected light signal R14 passes through filter strip FB1. As a result, the optical signal L_com1 can be output from the substrate 10 via the lens 40. In Figure 8, since multiple optical signals L11 to L14 can be multiplexed via the wavelength division multiplexing device 100 to generate the optical signal L_com1, the optical signal L_com1 can be regarded as a composite optical signal carried by a single optical fiber.

[0051] Figure 9 illustrates the optical path through which the wavelength division multiplexing (WDM) device 100 performs the demultiplexing mechanism. The WDM device 100 can be a wavelength division multiplexer. In other words, the WDM device 100 can receive a composite optical signal containing multiple wavelengths and separate it into individual wavelengths. This is essentially the reverse process of the wavelength division multiplexing mechanism. In Figure 9, the composite optical signal L_com2 can be demultiplexed and filtered by the substrate 10 and multiple filter strips FB1 to FB4 to generate multiple filtered optical signals R21 to R24. Details are as follows: After the composite optical signal L_com2 is input to the substrate 10 via the lens 40, the filter strip FB1 receives the composite optical signal L_com2. Then, a portion of the composite optical signal L_com2 passes through the filter strip FB1 to generate the filtered optical signal R21. The remaining portion of the composite optical signal L_com2 is reflected by the filter strip FB1 to generate the optical signal F21. The optical signal F21 is reflected by the substrate 10 and received by the filter strip FB2. Then, a portion of the optical signal F21 passes through the filter bar FB2 to generate a filtered optical signal R22. The remaining portion of the optical signal F21 is reflected by the filter bar FB2 to generate the optical signal F22. The optical signal F22 is reflected by the substrate 10 and received by the filter bar FB3. Then, a portion of the optical signal F22 passes through the filter bar FB3 to generate a filtered optical signal R23. The remaining portion of the optical signal F22 is reflected by the filter bar FB3 to generate the optical signal F23. The optical signal F23 is reflected by the substrate 10 and received by the filter bar FB4. When the optical signal F23 passes through the filter bar FB4, the optical signal F23 becomes the filtered optical signal R24. In the wavelength division multiplexing (WDM) device 100 of FIG9, the prism 11 includes a first surface P1, a second surface P2, and a third surface P3. The second surface P2 is disposed on one side of the first surface P1. The third surface P3 is disposed on one side of the first surface P1 and the second surface P2. Furthermore, the third surface P3 is configured to receive multiple filtered optical signals R21 to R24. The second surface P2 is configured to reflect the multiple filtered optical signals R21 to R24 to generate multiple reflected optical signals L21 to L24. For example, the filtered optical signal R21 is reflected by the second surface P2 to generate the reflected optical signal L21. The filtered optical signal R22 is reflected by the second surface P2 to generate the reflected optical signal L22. The filtered optical signal R23 is reflected by the second surface P2 to generate the reflected optical signal L23. The filtered optical signal R24 is reflected by the second surface P2 to generate the reflected optical signal L24. In other words, when the wavelength division multiplexing device 100 is a wavelength demultiplexer, it can use wavelength selective elements (i.e., filters FB1 to FB4) to separate specific wavelengths from the composite optical signal L_com2. Each wavelength carries an independent data channel. Thus, the wavelength demultiplexer directs each channel to its corresponding output port.

[0052] Figure 10 illustrates the coating technique of the substrate 10 of the wavelength division multiplexing (WDM) device 100 when performing a multiplexing mechanism. Figure 11 illustrates the coating technique of the substrate 10 of the WDM device 100 when performing a demultiplexing mechanism. In this embodiment, to achieve light splitting and combining efficiency, an anti-reflective (AR) coating and a distributed Bragg reflector (DBR) coating may be introduced into the substrate 10 when performing a multiplexing or demultiplexing mechanism. The AR coating is a micro-thin layer of material applied to the surface of the lens 40. The AR coating can be designed to reduce light reflection and increase light transmittance. The DBR coating is an optical filter that reflects light of a specific wavelength while allowing other wavelengths to pass through. It consists of multiple layers of alternating materials with different refractive indices. The DBR coating structure can selectively reflect light of a specific wavelength based on its interference pattern. In this embodiment, the DBR coating can be considered as a mirror surface on the edge surface of the substrate 10 for reflecting optical signals.

[0053] Figure 12 is a flowchart of the manufacturing process of the wavelength division multiplexing (WDM) device 100. The WDM device 100 can be manufactured according to steps S1201 to S1204. Any reasonable technical or hardware modifications fall within the scope of this invention. Steps S1201 to S1204 are described in the following table:

[0054] Step S1201: Etch the surface of the substrate 10 to form one or more grooves 10a;

[0055] Step S1202: Coat multiple filter strips FB1 to FB4;

[0056] Step S1203: After the multiple filter strips FB1 to FB4 are coated, the multiple filter strips FB1 to FB4 are joined in one or more grooves 10a of the substrate 10.

[0057] Step S1204: The resin 20 disposed on the substrate 10 is pressed by the working mold 30 to form the prism 11.

[0058] The details of steps S1201 to S1204 have been described above and will not be repeated here. In the wavelength division multiplexing (WDM) device 100, since the glass wafer is etched to form one or more grooves 10a for filter bonding alignment, the accuracy and positioning quality of filter alignment can be improved. Furthermore, the complexity of the filter bonding alignment process can be reduced. As a result, the WDM device 100 can be miniaturized.

[0059] In summary, this invention discloses a wavelength division multiplexing (WDM) device and its manufacturing method. The WDM device includes a substrate with etched grooves to accommodate multiple filter strips. Prisms are formed by imprinting resin onto the substrate to cover the filter strips. The manufacturing method of this invention simplifies the assembly process by pre-defining the positions of the filter strips within the grooves, resulting in a more compact and robust optical assembly, thus suitable for various applications in optical communications.

[0060] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made in accordance with the claims of the present invention should be included within the scope of the present invention.

Claims

1. A wavelength division multiplexing (WDM) device, comprising: a substrate having one or more grooves; a plurality of filter strips disposed in the one or more grooves of the substrate, wherein each of the plurality of filter strips corresponds to an optical filtering wavelength; and a prism disposed on the substrate and configured to cover the plurality of filter strips; wherein a surface of the substrate is etched to form the one or more grooves, and after the plurality of filter strips are coated, the plurality of filter strips are bonded to the one or more grooves of the substrate; and a resin disposed on the substrate is pressed by a working mold to form the prism.

2. The wavelength division multiplexing device as claimed in claim 1, wherein the one or more grooves have the same depth and the same width, and the substrate is a glass wafer.

3. The wavelength division multiplexing apparatus of claim 1, wherein the plurality of surfaces of the plurality of filter strips are coated with different glass coating liquid materials, and the plurality of filter strips are bonded to the one or more grooves of the substrate by using an adhesive material having a refractive index matching that of a glass.

4. The wavelength division multiplexing apparatus of claim 1, wherein after the plurality of filter strips are joined in the one or more grooves of the substrate, the substrate is treated by a thermosetting process to heat an adhesive material located between the plurality of filter strips and the one or more grooves, or by an ultraviolet curing process to change the adhesive material from a liquid state to a hardened state.

5. The wavelength division multiplexing apparatus of claim 1, wherein the working die includes a predetermined pattern corresponding to the prism, the working die presses the resin with a controlled force for a duration to form the prism, and after the duration has elapsed, the working die is removed from the substrate.

6. The wavelength division multiplexing (WDM) device of claim 1, wherein the substrate is sawn to adjust a dimension of the WDM device.

7. The wavelength division multiplexing (WDM) device of claim 1, wherein the WDM device is a wavelength division multiplexer, and the prism comprises: a first surface configured to receive a plurality of optical signals having a plurality of optical wavelengths; a second surface disposed on one side of the first surface and configured to reflect the plurality of optical signals to generate a plurality of reflected optical signals; and a third surface disposed on one side of the first surface and the second surface and configured to receive the plurality of reflected optical signals.

8. The wavelength division multiplexing (WDM) device of claim 7, wherein the plurality of reflected light signals are received by the plurality of filter strips via the third surface of the prism, and the plurality of reflected light signals are multiplexed by the substrate to generate a composite light signal.

9. The wavelength division multiplexing (WDM) device of claim 1, wherein the WDM device is a wavelength division multiplexer, and the prism comprises: a first surface configured to output a plurality of reflected optical signals; a second surface disposed on one side of the first surface and configured to reflect a plurality of filtered optical signals to generate the plurality of reflected optical signals; and a third surface disposed on one side of the first surface and the second surface and configured to receive the plurality of filtered optical signals.

10. The wavelength division multiplexing apparatus of claim 9, wherein a composite optical signal is demultiplexed and filtered by the substrate and the plurality of filter strips to generate the plurality of filtered optical signals.

11. A method for manufacturing a wavelength division multiplexing (WDM) device, comprising: etching a surface of a substrate to form one or more grooves; coating a plurality of filter strips; after the plurality of filter strips are coated, joining the plurality of filter strips into the one or more grooves of the substrate; and pressing a resin disposed on the substrate through a working mold to form a prism; wherein each of the plurality of filter strips corresponds to an optical filtering wavelength, and the prism is disposed on the substrate and configured to cover the plurality of filter strips.

12. The method of manufacturing a wavelength division multiplexing (WDM) device as claimed in claim 11, wherein the one or more grooves have the same depth and the same width, and the substrate is a glass wafer.

13. The method of manufacturing a wavelength division multiplexing (WDM) device as claimed in claim 11, wherein the plurality of filter strips are coated by coating the plurality of surfaces of the plurality of filter strips with different glass coating liquid materials, and the plurality of filter strips are joined in one or more grooves of the substrate by using an adhesive material having a refractive index matching a glass to join the plurality of filter strips in one or more grooves of the substrate.

14. The method of manufacturing a wavelength division multiplexing (WDM) device as claimed in claim 11, further comprising: after the plurality of filter strips are joined in the one or more grooves of the substrate, performing a thermosetting process to heat an adhesive material located between the plurality of filter strips and the one or more grooves, or performing an ultraviolet curing process to change the adhesive material from a liquid state to a hardened state.

15. The method of manufacturing a wavelength division multiplexing (WDM) device as claimed in claim 11, wherein the resin disposed on the substrate by the working die is pressed to form the prism, comprising: pressing the resin with a controlled force for a duration to form the prism; and removing the working die from the substrate after the duration has elapsed; wherein the working die comprises a predetermined pattern corresponding to the prism.

16. The method of manufacturing a wavelength division multiplexing (WDM) device as claimed in claim 11, further comprising: sawing the substrate to adjust a size of a WDM device; wherein the substrate, the plurality of filter strips, and the prism form the WDM device.

17. The method of manufacturing a wavelength division multiplexing (WDM) device as claimed in claim 16, wherein the WDM device is a wavelength division multiplexer, and the prism comprises: a first surface configured to receive a plurality of optical signals having a plurality of optical wavelengths; a second surface disposed on one side of the first surface and configured to reflect the plurality of optical signals to generate a plurality of reflected optical signals; and a third surface disposed on one side of the first surface and the second surface and configured to receive the plurality of reflected optical signals.

18. The method of manufacturing a wavelength division multiplexing (WDM) device as claimed in claim 17, wherein the plurality of reflected light signals are received by the plurality of filter strips via the third surface of the prism, and the plurality of reflected light signals are multiplexed by the substrate to generate a composite light signal.

19. The method of manufacturing a wavelength division multiplexing (WDM) device as claimed in claim 16, wherein the WDM device is a wavelength division multiplexer, and the prism comprises: a first surface configured to output a plurality of reflected optical signals; a second surface disposed on one side of the first surface and configured to reflect a plurality of filtered optical signals to generate the plurality of reflected optical signals; and a third surface disposed on one side of the first surface and the second surface and configured to receive the plurality of filtered optical signals.

20. The method of manufacturing a wavelength division multiplexing (WDM) device as claimed in claim 19, wherein a composite optical signal is demultiplexed and filtered by the substrate and the plurality of filter strips to generate the plurality of filtered optical signals.

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