An optical circulator component with wavelength division function

Abstract

The present invention provides an optical ring component with wavelength division function, including a circulator core component and a wavelength division component, the circulator core component includes a first PBS prism and a second PBS prism, and a non-reciprocal optical rotation element is arranged between the first PBS prism and the second PBS prism; the wavelength division component includes a substrate, a light inlet is formed on one side of the substrate adjacent to the second PBS prism, at least two filters for allowing light of a specific wavelength to pass through are arranged on the other side of the substrate, a reflective film for reflecting light that does not pass through the filter is arranged on one side of the substrate, and a reflective sheet for reflecting light to one side of the substrate is arranged between adjacent filters. Compared with the prior art, the optical ring component is a polarization-independent free space component in which a circulator core component and a wavelength division multiplexing component are connected as one body, and there is no optical fiber input and output at both ends; coupling loss is reduced, the performance is better while the size is smaller, the cost is lower, and it can be packaged in various positions in the device.

Description

Technical Field

[0001] The invention relates to the field of optical communication, in particular to an optical ring component with wavelength division function. Background Art

[0002] like Figure 1 As shown, the existing two-channel wavelength division technical solution includes an independent online three-port optical circulator 1, an independent online three-port optical wavelength division multiplexer 2 (inline means that there are optical fiber input and output at both ends), and the three ports 13 of the circulator are connected to the COM end of the wavelength division multiplexer through optical fiber to form an optical circulator component with a wavelength splitting function. When light is input from the first port 11 of the circulator, it is output from the second port 12. When light is input from the second port 12 of the circulator, it is output from the third port 13. The light output from the third port 13 will enter the wavelength division multiplexer, and two channels of light beams with different wavelengths will be output from the transmission end and the reflection end of the wavelength division multiplexer respectively.

[0003] Due to the minimum bending radius of optical fibers, the fusion and winding of optical fibers during the connection and packaging process will cause certain losses and affect the size of the overall component. Under the current processing technology limitations, the size of the existing two-channel wavelength division optical ring technology solution is usually around 100mm×80mm×20mm. Figure 1 The dimensions of an embodiment may typically be 8 mm x 8 mm x 3 mm.

[0004] like Figure 2 As shown, in the existing four-channel wavelength division optical circulator technical solution, the light output from the three ports 13 of the optical circulator is multi-channel wavelength division in the following manner: the reflection end of the wavelength division multiplexer of the previous stage or the three ports 13 of the optical circulator are connected to the COM end of the wavelength division multiplexer of the next stage, and the wavelength division of one channel can be increased by connecting each three-port wavelength division multiplexer. The light beam output from the transmission end of each stage will pass through the reflection loss of the filter 21 and the coupling loss of the optical fiber coupled into the reflection end one more time than the light beam output from the transmission end of the previous stage. Due to the existence of this accumulated loss with the increase in the number of channels, the loss of the subsequent channels will be greater. Cascading multiple wavelength division multiplexers will also lead to a significant increase in cost and an increase in the overall device volume. Summary of the invention

[0005] In view of the above problems, the present invention provides an optical ring assembly with wavelength division function, which combines the functions of an optical circulator and a wavelength division multiplexer, has a compact structure, an arbitrary number of wavelength division channels, and smaller multi-channel cumulative loss.

[0006] The technical solution adopted by the present invention is:

[0007] An optical ring component with wavelength division function comprises a circulator core component and a wavelength division component. The circulator core component comprises a first PBS prism and a second PBS prism. A non-reciprocal optical rotation element is arranged between the first PBS prism and the second PBS prism. A first port is formed on the other side of the second PBS prism. A second port for light incident from the first port to be emitted is formed on the same direction side of the first port on the first PBS prism and the second PBS prism. The second port is located above the first port. A third port for light incident from the second port to be emitted to the wavelength division component is also formed on the other side of the second PBS prism. The wavelength division component comprises a substrate. A light inlet is formed on one side of the substrate adjacent to the second PBS prism. At least two filters for light of a specific wavelength to pass through are arranged on the other side of the substrate. A reflective film for reflecting light reflected back without passing through the filter is arranged on one side of the substrate. A reflective sheet for reflecting light to one side of the substrate is arranged between adjacent filters.

[0008] Preferably, the non-reciprocal optical rotation element includes a half-wave plate bonded to a side surface of the first PBS prism, and a Faraday rotator bonded to the other side surface of the half-wave plate, the other side surface of the Faraday rotator bonded to one side surface of the second PBS prism, and the half-wave plate has an optical axis of 22.5°.

[0009] Preferably, an AR film is provided inside the light entrance of the substrate.

[0010] Preferably, the reflective film is a HR film.

[0011] Preferably, the reflective sheet is a HR sheet, which is a rectangular block with a high-reflective HR film coated on one side bonded to the substrate.

[0012] Preferably, when the wavelength division component has two channels, the filter in the second channel is replaced with an AR filter.

[0013] More preferably, the AR sheet is a rectangular block with one light-transmitting surface being polished and the other surface being coated with an air-anti-reflective AR film, and the polished surface of the AR sheet is the surface bonded to the substrate.

[0014] Preferably, the circulator core component and the wavelength division component are both adhered to the same base plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides an optical ring component with wavelength division function, which is a free-space component with a circulator core component connected as one body, no optical fiber input and output at both ends, and polarization-independent; the circulator core divides two different optical paths through two PBS prisms, and passes through a non-reciprocal optical rotation component in the middle, so as to realize the circulator function that the light in two directions takes different optical paths, wherein one outgoing light enters a wavelength division component coated with an AR film and an HR film on one side and a filter, an HR film, and an AR film on the other side to realize the function of splitting light according to different wavelengths, and the number of split channels can be increased by increasing the length of the glass substrate and adding corresponding film sheets on both sides, and the number of split channels is arbitrary; because the added channel passes through a total of three reflections of the WDM film and the HR film more than the previous channel, the coupling loss is reduced compared with the existing solution, and the size is smaller while the performance is better and the cost is lower; such a free-space component with a compact structure and small size can be packaged in various positions in the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 , is a schematic diagram of a two-channel wavelength division optical ring technology solution in the prior art;

[0017] Figure 2 , is a schematic diagram of a four-channel wavelength division optical ring technology solution in the prior art;

[0018] Figure 3 , which is a schematic diagram of an incident light beam from a first port in a two-channel implementation manner of an optical ring component with a wavelength division function provided by the present invention;

[0019] Figure 4 , which is a schematic diagram of an incident light beam from a second port in a two-channel implementation manner of an optical ring component with a wavelength division function provided by the present invention;

[0020] Figure 5 , is a schematic diagram of an incident light beam from a first port in a four-channel implementation manner of an optical ring component with a wavelength division function provided by the present invention;

[0021] Figure 6 , which is a schematic diagram of an incident light beam from a second port in a four-channel implementation of an optical ring component with a wavelength division function provided by the present invention. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail with reference to the accompanying drawings.

[0023] Figures 3 to 6 , which is a preferred embodiment of an optical ring assembly with wavelength division function provided by the present invention. Figures 3 to 6As shown, the optical ring assembly with wavelength division function includes a circulator core assembly 10 and a wavelength division assembly 20, the circulator core assembly 10 includes a first PBS prism 11 and a second PBS prism 12, a non-reciprocal optical rotation element 13 is arranged between the first PBS prism 11 and the second PBS prism 12, a first port 101 is formed on the other side of the second PBS prism 12, a second port 102 for light incident from the first port is formed on the same side of the first PBS prism 11 and the second PBS prism 12 in the same direction, and the second port 102 is located above the first port 101, and a third port 103 for light incident from the second port is also formed on the other side of the second PBS prism 12 for light incident from the second port to be emitted to the wavelength division assembly; the wavelength division assembly 20 includes a substrate 21, a side of the substrate 21 adjacent to the second PBS prism forms a light inlet 201, and the other side of the substrate is provided with at least two filters 22 for light of a specific wavelength to pass through, and one side of the substrate 22 is provided with a filter for filtering light that is not transmitted through A reflective film 23 is provided between adjacent filters to reflect the light reflected back from the filter. A reflective sheet 24 is provided between adjacent filters to reflect the light to one side of the substrate. In this way, the light incident from the first port 101 passes through the second PBS prism 12, the non-reciprocal optical rotation element 13 and the first PBS prism 11 and is emitted from the second port 102. The light incident from the second port passes through the first PBS prism 12, the non-reciprocal optical rotation element 13 and the second PBS prism 12 and is emitted from the third port 103 and is reflected from the wavelength division component 20. When the light enters the wavelength division component 20 through the light inlet 201 and is transmitted to the filter 22 of the first channel on the other side of the substrate, the light that meets the emission wavelength of the first channel filter is emitted from the filter 22, and the remaining light is reflected to one side of the substrate and reflected to the other side of the substrate by the reflective film 23. The reflective sheet 24 on the other side of the substrate reflects the light to the reflective film 23 on one side of the substrate, and then reflects it to the filter 22 of the second channel, emitting light that meets the conditions... and so on, until the light is emitted from the last filter.

[0024] The circulator core assembly 10 and the wavelength division assembly 20 are both attached to the same base plate 30. The wavelength division assembly 20 can be a wavelength division assembly with any number of channels greater than two channels. By increasing the length of the base plate and adding corresponding membranes on both sides of the base plate, the number of light splitting channels can be arbitrary, and light splitting can be performed according to different wavelengths, for example, Figure 3 to Figure 4 The number of splitting channels of the medium wave subassembly is two channels. Figures 5 and 6 The number of splitting channels of the medium wave splitter is four. When the wavelength splitter is two-channel, the filter in the second channel can be replaced with an AR sheet 25. The AR sheet is a rectangular block with one side of the light passing surface polished and the other side coated with an air anti-reflection AR film. The polished surface of the AR sheet is the surface bonded to the glass substrate.

[0025] An AR film 211 is provided in the light inlet 201 of the substrate. AR film (Anti-Reflection) is called an anti-reflection film, or also called an anti-reflection film, which can effectively increase the transmittance of light passing through the substrate and reduce the reflectivity. The reflective film 23 is an HR film, and the HR film (High-Reflection) is a high-reflection film. The reflective sheet 24 is an HR sheet, which is a rectangular block with a high-reflection HR film coated on one side bonded to the substrate. The filter 22 is a rectangular block of WMS-15 or equivalent material, with one side of the light-transmitting surface coated with an AR film for air and the other side coated with a bandpass filter film of the corresponding wavelength. The WDM film surface is the surface bonded to the glass substrate.

[0026] It is worth noting that the PBS prism is a polarization beam splitter prism, which can split the incident non-polarized light into two perpendicular linear polarized light beams, of which the P polarized light passes completely, while the S polarized light is reflected at an angle of 45 degrees, and the outgoing direction is 90 degrees to the P light. The polarization beam splitter prism is made of a pair of high-precision right-angle prisms glued together, and the hypotenuse of one of the prisms is coated with a polarization beam splitter medium film.

[0027] The non-reciprocal optical rotator comprises a half-wave plate 131 bonded to the side surface of the first PBS prism, and a Faraday rotator 132 bonded to the other side surface of the half-wave plate. The other side surface of the Faraday rotator 132 is bonded to one side surface of the second PBS prism 12. The half-wave plate 131 has a 22.5° optical axis. When the light beam is incident from the first port 101, the light beam incident from the first port 101 enters the 45° polarization splitting film surface of the second PBS prism 12 and is divided into P light and S light. The P light (polarization vector is parallel to the incident light beam) The incident light (light beam with a plane common to the incident light and the reflected light) is transmitted, and the S light (light beam with a polarization vector perpendicular to the plane common to the incident light and the reflected light) is reflected. The P light and the S light sequentially pass through the Faraday rotator 132 and the half-wave plate 131 with an optical axis of 22.5°, and the polarization direction remains unchanged. At the 45° polarization splitting film surface of the first PBS prism 11, the P light is transmitted, and the S light is reflected. The P light and the S light are combined into a beam of light, which is emitted from the second port 102 after total reflection. When the light beam is incident from the second port 102, the light beam is incident on the first PBS prism 11. At the 45° polarization splitter film surface of the S prism, it is divided into P light and S light. The P light is transmitted and the S light is reflected. The P light and the S light pass through the half-wave plate 131 with an optical axis of 22.5° and the Faraday rotator 132 in turn. The polarization directions of the P light and the S light are rotated 90° in one direction. The P light becomes S' light and the S light becomes P' light. The two light beams enter the polarization splitter film surface of the second PBS prism 12. The P light is transmitted and the S light is reflected. The two light beams are combined into a circularly polarized light beam, which is totally reflected at the glass-air interface and passes through the second PBS prism 12. The third port 103 is incident from the light inlet 201 coated with the AR film of the wavelength division component, enters the glass substrate 21 to the filter 22 of the first channel, and satisfies the light transmission of the transmission wavelength of the filter 22 of the first channel. The light of other wavelengths is reflected at the WDM film of the filter, reflected at the HR film 23 on the other side of the glass substrate 21, reflected at the HR film 24 on the other side, and reflected at the HR film 23 on the other side of the glass substrate 21, and satisfies the light transmission of the transmission wavelength of the filter 22 of the second channel, and so on to the last channel.

[0028] It is worth noting that Figure 3 to Figure 4 When the wavelength division component is a two-channel component, an AR film is arranged at the second channel. After the light of the transmission wavelength of the filter 22 of the first channel is transmitted, the light of the remaining wavelengths is reflected at the WDM film of the filter, reflected at the HR film 23 on the other side of the glass substrate, reflected at the HR film 24 on the other side, and reflected at the HR film 23 on the other side of the glass substrate, so that the light of the transmission wavelength of the AR film of the second channel is transmitted.

[0029] In summary, the technical solution of the present invention can fully and effectively achieve the above-mentioned invention purpose, and the structure and functional principle of the present invention have been fully verified in the embodiments, and can achieve the expected effect and purpose. Without departing from the principle and essence of the present invention, various changes or modifications can be made to the embodiments of the invention. Therefore, the present invention includes all replacement contents within the scope mentioned in the scope of the patent application, and any equivalent changes made within the scope of the patent application of the present invention are within the scope of the patent application of this case.

Claims

1. An optical ring component with wavelength division function, characterized in that: The invention comprises a circulator core component and a wavelength division component. The circulator core component comprises a first PBS prism and a second PBS prism. A non-reciprocal optical rotation element is arranged between the first PBS prism and the second PBS prism. A first port is formed on the other side of the second PBS prism. A second port for light incident from the first port to be emitted is formed on the same direction side of the first PBS prism and the second PBS prism. The second port is located above the first port. A third port for light incident from the second port to be emitted to the wavelength division component is also formed on the other side of the second PBS prism. The wavelength division component comprises a substrate. A light inlet is formed on one side of the substrate adjacent to the second PBS prism. At least two filters for light of a specific wavelength to pass through are arranged on the other side of the substrate. A reflective film for reflecting light reflected back without passing through the filter is arranged on one side of the substrate. A reflective sheet for reflecting light to one side of the substrate is arranged between adjacent filters.

2. The optical ring assembly with wavelength division function according to claim 1, characterized in that: The non-reciprocal optical rotator comprises a half-wave plate attached to a side surface of the first PBS prism and a Faraday rotator attached to another side surface of the half-wave plate. The other side surface of the Faraday rotator is attached to one side surface of the second PBS prism. The half-wave plate has an optical axis of 22.5°.

3. The optical ring assembly with wavelength division function according to claim 1, characterized in that: An AR film is arranged in the light entrance of the substrate.

4. The optical ring assembly with wavelength division function according to claim 1, characterized in that: The reflective film is a HR film.

5. The optical ring assembly with wavelength division function according to claim 1, characterized in that: The reflective sheet is a HR sheet, which is a rectangular block with a high-reflective HR film coated on one side bonded to the substrate.

6. The optical ring assembly with wavelength division function according to claim 1, characterized in that: When the wavelength division component has two channels, the filter in the second channel is replaced with an AR filter.

7. The optical ring assembly with wavelength division function according to claim 6, characterized in that: The AR sheet is a rectangular block with one light-transmitting surface polished and the other surface coated with an air-anti-reflective AR film, and the polished surface of the AR sheet is the surface bonded to the substrate.

8. The optical ring assembly with wavelength division function according to claim 1, characterized in that: The circulator core component and the wave splitter component are both adhered to the same bottom plate.

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