High-isolation ROSA passive optical assembly, module and optical transmission module

Abstract

The utility model discloses a high-isolation ROSA passive optical assembly, a high-isolation ROSA passive optical module and a high-isolation ROSA passive optical transmission module. The collimator is used for receiving a signal transmitted by the input optical fiber, and a first optical filter is attached to the emergent end of the collimator; the light emitting side of the prism is provided with a plurality of second optical filters which are distributed in an array, and the prism and the second optical filters are used for decomposing or multiplexing optical signals with different wavelengths; and the lens arrays are in one-to-one correspondence with the second optical filters, and the lens arrays are used for transmitting the decomposed or multiplexed optical signals to a receiving end. Due to the fact that the first filter is attached to the emergent end of the collimator, the light emergent angle of the collimator is small, the incident angle incident to the first filter is small, the isolation degree can reach 25 dB or above, due to processing of the second filter, the isolation degree can be increased by 20 dB or above, the isolation degree of the whole assembly can reach 45 dB or above, and the light emitting efficiency of the assembly is improved. And the isolation degree of other wave bands is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber communication, in particular to a high-isolation ROSA passive optical component, module and optical transmission module. Background Art

[0002] The optical transmission module is divided into a single-mode optical transmission module and a multi-mode optical transmission module. Its overall architecture includes two major parts: an optical subassembly (OSA) and an electronic subassembly (ESA). Among them, the optical subassembly can be further divided into a transmitter optical subassembly (TOSA) and a receiver optical subassembly (ROSA). The optical receiver subassembly (ROSA) includes an optical receiving component and a PD array component. However, the existing optical receiving components mostly use arrayed waveguide gratings (AWG) with an isolation of 18dB, which can meet the requirements for medium and low speed and short distance transmission, but its isolation is low for high-speed and long-distance transmission, and it is difficult to meet the current high-speed transmission needs. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a high-isolation ROSA passive optical component, module and optical transmission module, which have the advantages of improved isolation and low process difficulty.

[0004] The purpose of the utility model is achieved by the following technical solutions:

[0005] According to a first aspect of an embodiment of the present disclosure, a high-isolation ROSA passive optical component is provided, comprising:

[0006] substrate;

[0007] A collimator carried on the substrate and used for receiving a signal transmitted by an input optical fiber, wherein a first optical filter is mounted on an output end of the collimator;

[0008] A prism carried on the substrate and arranged corresponding to the collimator, wherein a plurality of second filters distributed in an array are arranged on the light-emitting side of the prism, and the prism and the second filters are used to decompose or multiplex optical signals of different wavelengths; and

[0009] A lens array is carried on the substrate and corresponds one-to-one to each of the second optical filters, and the lens array is used to transmit the decomposed or multiplexed optical signal to a receiving end.

[0010] To implement the above technical solution, after the optical signal is transmitted from the input optical fiber to the collimator, it is first filtered by the first filter. Since the first filter is mounted on the output end of the collimator, the light output angle of the collimator is small, and the light can be incident on the first filter at a small angle. The isolation degree through the first filter can reach more than 25dB. Then the optical signal enters the prism to decompose or multiplex the optical signals of different wavelengths, and the optical signals of different wavelengths are emitted from the corresponding second filter. At this time, due to the processing of the prism and the second filter, the isolation degree can be increased by more than 20dB, so that the isolation degree of the entire component to other bands can reach more than 45dB, which greatly improves the isolation degree; finally, the optical signals of different wavelengths are converged to the receiving end after passing through the lens array for subsequent signal processing.

[0011] In some exemplary embodiments, a transmissive film and a reflective film are provided on the light incident side of the prism, the transmissive film and the reflective film overlap and cover the entire surface of the light incident side of the prism, and the transmissive film corresponds to the collimator.

[0012] To implement the above technical solution, the light signal is facilitated to enter the prism through the transmission film, and the light signal is reciprocatedly reflected in the prism through the reflection film until the light signal of the corresponding wavelength is emitted from the corresponding second filter.

[0013] In some exemplary embodiments, the prism and the lens array are both mounted and fixed to the substrate.

[0014] By implementing the above technical solution, the mounting process is simple, so as to realize automatic mounting and improve the consistency and stability of the product.

[0015] In some exemplary embodiments, the substrate is a ceramic plate.

[0016] According to a second aspect of an embodiment of the present disclosure, a high-isolation ROSA passive optical module is provided, comprising: at least two groups of high-isolation ROSA passive optical components as described in the first aspect, wherein the high-isolation ROSA passive optical components are arranged in sequence, and the collimators of adjacent high-isolation ROSA passive optical components are connected through reflective optical fibers, and the optical signal is reflected by a first filter and then transmitted to a next collimator by the reflective optical fiber.

[0017] To implement the above technical solution, by setting at least two groups of passive optical components, the isolation of the first group of passive optical components can reach more than 45dB, and the next group of passive optical components will also increase a certain isolation because its incident signal is an optical signal reflected by the first filter of the previous group of passive optical components. After being processed by the first filter, prism and second filter of this group of passive optical components, the overall isolation can reach more than 60dB. Therefore, passive optical components with the required isolation can be selected as needed, thereby making the application range wider.

[0018] According to a third aspect of an embodiment of the present disclosure, there is provided an optical transmission module, comprising:

[0019] A circulator having a common interface end, an output end, a first input end and a second input end; and,

[0020] In the high-isolation ROSA passive optical component as described in the first aspect, the collimator is connected to the output end via an input optical fiber;

[0021] When an optical signal is input from the common interface end, it passes through the circulator and is input from the output end to the collimator; when an optical signal is input from the first incident end or the second incident end, it passes through the circulator and is output from the common interface end.

[0022] To implement the above technical solution, when an optical signal is input from the common interface end, it enters the passive optical component from the output end after being processed by the circulator, thereby realizing high-isolation optical signal transmission; when an optical signal is input from the first incident end and the second incident end, that is, P light and S light are input from the first incident end and the second incident end respectively, they are output from the common interface end after being processed by the circulator, thereby realizing the requirement of high transmission rate.

[0023] According to a fourth aspect of an embodiment of the present disclosure, there is provided an optical transmission module, comprising:

[0024] A circulator having a common interface end, an output end, a first input end and a second input end; and,

[0025] In the high-isolation ROSA passive optical module as described in the second aspect, the collimator located at the top is connected to the output end through an input optical fiber;

[0026] When an optical signal is input from the common interface end, it passes through the circulator and is input from the output end to the collimator located at the top; when an optical signal is input from the first incident end or the second incident end, it passes through the circulator and is output from the common interface end.

[0027] To implement the above technical solution, when an optical signal is input from the common interface end, it enters the passive optical component from the output end after being processed by the circulator, thereby realizing high-isolation optical signal transmission and being able to meet transmission requirements of different isolations; when an optical signal is input from the first incident end and the second incident end, that is, P light and S light are input from the first incident end and the second incident end respectively, they are output from the common interface end after being processed by the circulator, thereby realizing the requirement of high transmission rate.

[0028] In summary, compared with the prior art, the utility model has the following beneficial effects:

[0029] The utility model embodiment provides a high-isolation ROSA passive optical component, module and optical transmission module, wherein the high-isolation ROSA passive optical component includes: a substrate; a collimator carried on the substrate and used to receive a signal transmitted by an input optical fiber, the output end of the collimator is mounted with a first filter; a prism carried on the substrate and arranged corresponding to the collimator, the light output side of the prism is provided with a plurality of second filters distributed in an array, the prism and the second filters are used to realize decomposition or multiplexing of optical signals of different wavelengths; and a lens array carried on the substrate and corresponding to each of the second filters one by one, the lens array is used to transmit the decomposed or multiplexed optical signal to the receiving end. After the optical signal is transmitted from the input optical fiber to the collimator, it is first filtered by the first filter. Since the first filter is mounted on the output end of the collimator, the light output angle of the collimator is small, and the light can be incident on the first filter at a small angle. The isolation through the first filter can reach more than 25dB. Then the optical signal enters the prism to decompose or multiplex the optical signals of different wavelengths. The optical signals of different wavelengths are emitted from the corresponding second filter. At this time, due to the processing of the prism and the second filter, the isolation can be increased by more than 20dB, so that the isolation of the entire component to other bands can reach more than 45dB, which greatly improves the isolation; finally, the optical signals of different wavelengths are converged to the receiving end after passing through the lens array for subsequent signal processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of the first embodiment of the present utility model.

[0031] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present utility model.

[0032] Figure 3 This is a schematic diagram of the structure of the third embodiment of the present invention.

[0033] Figure 4 This is a schematic structural diagram of the fourth embodiment of the present utility model.

[0034] The numbers and letters in the figure represent the corresponding component names:

[0035] 101, substrate; 102, collimator; 103, first filter; 104, prism; 1041, transmission film; 1042, reflection film; 105, second filter; 106, lens array; 107, input optical fiber; 108, receiving end; 109, reflection optical fiber; 201, circulator; 202, common interface end; 203, output end; 204, first incident end; 205, second incident end. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Embodiment 1

[0038] like Figure 1 As shown, an embodiment of the utility model provides a high-isolation ROSA passive optical component, including: a substrate 101; a collimator 102 carried on the substrate 101 and used to receive a signal transmitted by an input optical fiber 107, and the output end 203 of the collimator 102 is mounted with a first filter 103; a prism 104 carried on the substrate 101 and arranged corresponding to the collimator 102, and a plurality of second filters 105 distributed in an array are arranged on the light output side of the prism 104, and the prism and the second filters 105 are used to realize decomposition or multiplexing of optical signals of different wavelengths; and a lens array 106 carried on the substrate 101 and corresponding to each second filter 105, and the lens array 106 is used to transmit the decomposed or multiplexed optical signal to the receiving end 108.

[0039] Specifically, the prism 104 and the lens array 106 are both mounted and fixed on the substrate 101. Since the mounting process is simple, automatic mounting can be achieved. For example, automatic mounting processing can be achieved through existing automated equipment, thereby improving the consistency and stability of the product; the first filter 103 and the second filter 105 are mounted on the collimator 102 and the prism 104 respectively through TFF coating technology. For example, the second filter 105 can adopt four groups of TFF thin film filters, which can be set to different wavelengths as needed, so that light signals of different wavelengths can pass through. Correspondingly, the lens array 106 is also provided with four groups corresponding to the second filter 105; the substrate 101 preferably adopts a ceramic plate.

[0040] In some embodiments, a transmissive film 1041 and a reflective film 1042 are provided on the light incident side of the prism 104. The transmissive film 1041 and the reflective film overlap and cover the entire surface of the light incident side of the prism 104. The transmissive film 1041 corresponds to the collimator 102. The transmissive film 1041 facilitates the optical signal to enter the prism 104, while the reflective film causes the optical signal to reflect back and forth in the prism 104 until an optical signal of a corresponding wavelength is emitted from the corresponding second filter 105.

[0041] After the optical signal is transmitted from the input optical fiber 107 to the collimator 102, it is first filtered by the first filter 103. Since the first filter 103 is mounted on the output end of the collimator 102, the light output angle of the collimator 102 is small, and the light can be incident on the first filter at a small angle. The isolation degree of the first filter 103 can reach more than 25dB. Then the optical signal enters the prism 104 to decompose or multiplex the optical signals of different wavelengths. The optical signals of different wavelengths are emitted from the corresponding second filter 105. At this time, due to the processing of the prism 104 and the second filter 105, the isolation degree can be increased by more than 20dB, so that the isolation degree of the entire component to other bands can reach more than 45dB, which greatly improves the isolation degree; finally, the optical signals of different wavelengths are converged to the receiving end 108 after passing through the lens array 106 for subsequent signal processing.

[0042] Embodiment 2

[0043] like Figure 2 As shown, an embodiment of the utility model provides a high-isolation ROSA passive optical module, comprising: at least two groups of high-isolation ROSA passive optical components as described in Example 1, each high-isolation ROSA passive optical component is arranged in sequence, and the collimators 102 of adjacent high-isolation ROSA passive optical components are connected through a reflection optical fiber 109, and the optical signal is reflected by the first filter 103 and then transmitted to the next collimator 102 by the reflection optical fiber 109.

[0044] By setting up at least two groups of passive optical components, the isolation of the first group of passive optical components can reach more than 45dB, and the next group of passive optical components will also increase a certain isolation because its incident signal is the optical signal reflected by the first filter 103 of the previous group of passive optical components. After being processed by the first filter 103, prism 104 and second filter 105 of this group of passive optical components, the overall isolation can reach more than 60dB. Therefore, passive optical components with the required isolation can be selected as needed, thereby making the application range wider.

[0045] Embodiment 3

[0046] like Figure 3As shown, an embodiment of the utility model provides an optical transmission module, including: a circulator 201, the circulator 201 has a common interface end 202, an output end 203, a first input end 204 and a second input end 205; and, as the high-isolation ROSA passive optical component described in Example 1, the collimator 102 is connected to the output end 203 through the input optical fiber 107; wherein, when the optical signal is input from the common interface end 202, it passes through the circulator 201 and then is input into the collimator 102 from the output end 203; when the optical signal is input from the first input end 204 or the second input end 205, it passes through the circulator 201 and then is output from the common interface end 202.

[0047] The circulator 201 can adopt an existing circulator 201 product. When an optical signal is input from the common interface end 202, it enters the passive optical component from the output end 203 after being processed by the circulator 201, thereby realizing high-isolation optical signal transmission; when an optical signal is input from the first incident end 204 and the second incident end 205, that is, P light and S light are input from the first incident end 204 and the second incident end 205 respectively, they are output from the common interface end 202 after being processed by the circulator 201, thereby realizing the requirement of high transmission rate.

[0048] Embodiment 4

[0049] like Figure 4 As shown, an embodiment of the utility model provides an optical transmission module, including: a circulator 201, the circulator 201 has a common interface end 202, an output end 203, a first input end 204 and a second input end 205; and, as described in the second embodiment of the high isolation ROSA passive optical module, the collimator 102 located at the top is connected to the output end 203 through the input optical fiber 107; wherein, when the optical signal is input from the common interface end 202, it passes through the circulator 201 and then is input from the output end 203 to the collimator 102 located at the top; when the optical signal is input from the first input end 204 or the second input end 205, it passes through the circulator 201 and then is output from the common interface end 202.

[0050] The circulator 201 can adopt an existing circulator 201 product. When an optical signal is input from the common interface end 202, it enters the passive optical component from the output end 203 after being processed by the circulator 201, thereby realizing high-isolation optical signal transmission and meeting the transmission requirements of different isolations; when an optical signal is input from the first incident end 204 and the second incident end 205, that is, P light and S light are input from the first incident end 204 and the second incident end 205 respectively, they are output from the common interface end 202 after being processed by the circulator 201, thereby realizing the requirement of high transmission rate.

[0051] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the utility model, several modifications and improvements can be made, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the utility model, and all of them belong to the protection scope of the utility model.

Claims

1. A high isolation ROSA passive optical component, characterized in that: include: substrate; A collimator carried on the substrate and used for receiving a signal transmitted by an input optical fiber, wherein a first optical filter is mounted on an output end of the collimator; A prism carried on the substrate and arranged corresponding to the collimator, wherein a plurality of second optical filters distributed in an array are arranged on the light-emitting side of the prism, and the prism and the second optical filters are used to decompose or multiplex optical signals of different wavelengths; A lens array is carried on the substrate and corresponds one-to-one to each of the second optical filters, and the lens array is used to transmit the decomposed or multiplexed optical signal to a receiving end.

2. The high isolation ROSA passive optical component according to claim 1, characterized in that: A transmission film and a reflection film are provided on the light incident side of the prism, the transmission film and the reflection film overlap and cover the entire surface of the light incident side of the prism, and the transmission film corresponds to the collimator.

3. The high isolation ROSA passive optical component according to claim 1 or 2, characterized in that: The prism and the lens array are both mounted and fixed on the substrate.

4. The high isolation ROSA passive optical component according to claim 1, characterized in that: The substrate is a ceramic plate.

5. A high isolation ROSA passive optical module, characterized in that: include: At least two groups of high-isolation ROSA passive optical components as described in any one of claims 1 to 4, wherein each of the high-isolation ROSA passive optical components is arranged in sequence, and the collimators of adjacent high-isolation ROSA passive optical components are connected through reflective optical fibers, and the optical signal is reflected by the first filter and then transmitted to the next collimator by the reflective optical fiber.

6. An optical transmission module, characterized in that: include: A circulator having a common interface end, an output end, a first input end and a second input end ； The high-isolation ROSA passive optical component according to any one of claims 1 to 4, wherein the collimator is connected to the output end via an input optical fiber; When an optical signal is input from the common interface end, it passes through the circulator and is input from the output end to the collimator; when an optical signal is input from the first incident end or the second incident end, it passes through the circulator and is output from the common interface end.

7. An optical transmission module, characterized in that: include: A circulator, the circulator having a common interface end, an output end, a first input end and a second input end; as well as, The high-isolation ROSA passive optical module according to claim 5, wherein the collimator located at the top is connected to the output end through an input optical fiber; When an optical signal is input from the common interface end, it passes through the circulator and is input from the output end to the collimator located at the top; when an optical signal is input from the first incident end or the second incident end, it passes through the circulator and is output from the common interface end.

Images