Optical communication light splitting system based on filter

Abstract

The utility model discloses an optical communication light splitting system based on filters, which relates to the technical field of optical communication and comprises a first lens (1), a second lens (2), a third lens (3), a first filter (4), a first reflector plate (5), a second filter (6), a second reflector plate (7), a third reflector plate (8) and a fourth lens (9). According to the utility model, the problems of low product yield and difficulty in batch production in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, and more specifically to an optical communication splitting system based on a filter. Background Technology

[0002] With the development of PON services in optical communication and the increasing demand for higher transmission rates, the need for 50GPON OLTs is becoming more urgent. The 50GPON OLT tri-mode solution adapts to the transmission needs of optical networks, offering greater integration and compatibility. 1270±10nm, 1286±2nm, and 1310±20nm are the receiving wavelengths of the 50GPON OLT tri-mode solution. The upper limit of 1270nm is 4nm away from the lower limit of 1286nm, and the upper limit of 1286nm is 2nm away from the lower limit of 1310nm. These short wavelength distances make effective splitting of these three wavelengths at the receiving end a crucial issue for 50G technology.

[0003] In existing methods, the three wavelengths at the receiving end are split using Z-Block, and the optical path is deflected by a filter after splitting. However, since Z-Block is sensitive to angle, the light may not be separated from the Z-block, thereby reducing the product yield. Furthermore, this solution is difficult for mass production. Utility Model Content

[0004] In view of the above-mentioned shortcomings in the prior art, the optical communication splitting system based on the filter provided by this utility model solves the problems of low product yield and difficulty in mass production of the existing methods.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows: an optical communication beam splitting system based on a filter, comprising a first lens, a second lens, a third lens, a first filter, a first reflector, a second filter, a second reflector, a third reflector, and a fourth lens;

[0006] The first lens converts the converged light of three wavelengths received through the ferrule into parallel light;

[0007] The first filter separates the main beam by reflecting parallel light. The first filter has high transmission of 1310nm wavelength light and high reflection of 1270nm and 1286nm wavelength light, so as to separate the 1310nm wavelength light.

[0008] The second filter is used to separate 1286nm wavelength light. The second filter has high transmission of 1286nm wavelength light and high reflection of 1270nm wavelength light.

[0009] The second reflector is used to reflect the separated 1286nm wavelength light into the second lens, and then into the APD;

[0010] The first reflector is used to reflect the separated 1270nm wavelength light into the fourth lens, and then into the APD;

[0011] The third reflector is used to reflect the separated 1310nm wavelength light into the third lens, and then into the APD;

[0012] The APD is used to receive and convert optical signals into electrical signals.

[0013] Furthermore, the reflection angles of the first filter include 8°, 10°, and 13°.

[0014] Furthermore, the overall dimensions of the system are L7.2mm*W3.5mm.

[0015] Furthermore, the dimensions of the first lens are Ø1mm L0.8mm R1.9mm;

[0016] The dimensions of the second lens are Ø1mm L0.8mm R1.9mm;

[0017] The dimensions of the third lens are Ø1mm L0.8mm R1.9mm;

[0018] The dimensions of the first filter are L3.4mm W2.1mm H0.25mm;

[0019] The dimensions of the first reflective sheet are L3.4mm W2.1mm H0.20mm;

[0020] The dimensions of the second filter are L3.4mm W2.1mm H0.40mm;

[0021] The dimensions of the second reflector are L3.4mm W2.1mm H0.15mm;

[0022] The dimensions of the third reflector are L3.4mm W2.1mm H0.20mm;

[0023] The dimensions of the fourth lens are Ø1mm L0.8mm R1.9mm;

[0024] Where Ø is the lens diameter, L is the lens or filter length, R is the lens radius of curvature, W is the filter width, and H is the filter or reflector thickness.

[0025] The beneficial effects of this invention are: It effectively splits light by introducing a filter, ensuring the bandwidth of a single wavelength. The innovative optical path results in a simple structure, facilitating production and aiding in mass production. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the optical path of an optical communication splitting system based on a filter.

[0027] Wherein: 1. First lens; 2. Second lens; 3. Third lens; 4. First filter; 5. First reflector; 6. Second filter; 7. Second reflector; 8. Third reflector; 9. Fourth lens. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 As shown, an optical communication splitting system based on a filter includes a first lens 1, a second lens 2, a third lens 3, a first filter 4, a first reflector 5, a second filter 6, a second reflector 7, a third reflector 8, and a fourth lens 9.

[0030] The components mentioned above are not limited to specific locations; their positions can be adjusted according to space requirements. Angular filters must be placed at the angle specified in their names, ensuring that the normal and the main optical path form this angle, to achieve complete beam splitting in one pass; otherwise, losses will occur in the transmission or cutoff bands.

[0031] The first lens 1 converts the converged light of three wavelengths received through the ferrule into parallel light;

[0032] The first filter 4 separates the main beam by reflecting parallel light. The first filter 4 has high transmission of 1310nm wavelength light and high reflection of 1270nm and 1286nm wavelength light, so as to separate the 1310nm wavelength light.

[0033] The second filter 6 is used to separate 1286nm wavelength light. The second filter 6 has high transmission of 1286nm wavelength light and high reflection of 1270nm wavelength light.

[0034] The second reflector 7 is used to reflect the separated 1286nm wavelength light into the second lens 2, and then into the APD;

[0035] The first reflector 5 is used to reflect the separated 1270nm wavelength light into the fourth lens 9, and then into the APD;

[0036] The third reflector 8 is used to reflect the separated 1310nm wavelength light into the third lens 3, and then into the APD;

[0037] The APD is used to receive and convert optical signals into electrical signals.

[0038] The reflection angles of the first filter 4 include 8°, 10° and 13°.

[0039] The overall dimensions of the system are L7.2mm*W3.5mm.

[0040] The dimensions of the first lens 1 are Ø1mm L0.8mm R1.9mm;

[0041] The dimensions of the second lens 2 are Ø1mm L0.8mm R1.9mm;

[0042] The dimensions of the third lens 3 are Ø1mm L0.8mm R1.9mm;

[0043] The dimensions of the first filter 4 are L3.4mm W2.1mm H0.25mm;

[0044] The dimensions of the first reflective sheet 5 are L3.4mm W2.1mm H0.20mm;

[0045] The dimensions of the second filter 6 are L3.4mm W2.1mm H0.40mm;

[0046] The dimensions of the second reflective sheet 7 are L3.4mm W2.1mm H0.15mm;

[0047] The dimensions of the third reflective sheet 8 are L3.4mm W2.1mm H0.20mm;

[0048] The dimensions of the fourth lens 9 are Ø1mm L0.8mm R1.9mm;

[0049] Where Ø is the lens diameter, L is the lens or filter length, R is the lens radius of curvature, W is the filter width, and H is the filter or reflector thickness.

[0050] Other specifications for each component are shown in Table 1, where Il is insertion loss, Passband is transmission band (T), and Stopband is stop band (R).

[0051] Table 1 Specifications of each component

[0052]

[0053] In one embodiment of this invention, the converged light of three wavelengths received from the ferrule is converted into parallel light by the first lens 1. The received parallel light is reflected by the first filter 4 to separate the main beam. The first filter 4 includes, but is not limited to, 8°, 10°, and 13° (the first filter 4 has high transmission for 1310nm and high reflection for 1270nm and 1286nm), first separating the 1310nm wavelength. The 1286nm and 1270nm light reflected by the first filter 4 is then passed through the second filter 6 (the second filter 6 has high transmission for 1286nm and high reflection for 1270nm), separating the 1286nm wavelength. The separated 1286nm light passes through the second reflector 7, enters the second lens 2, and then enters the APD. The 1270nm light reflected by the second filter 6 passes through the first reflector 5, enters the fourth lens 9, and then enters the APD. The 1310nm light passes through the third reflector 8, enters the third lens 3, and then enters the APD.

[0054] This invention proposes an optical communication splitting system based on filters. By introducing filters that transmit and reflect different wavelengths, it achieves effective light splitting, solving the problem of insufficient coupling space and ensuring single-wavelength bandwidth. The structure is simple, easy to manufacture, and helpful for mass production.

[0055] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of this invention, and should be understood that the scope of protection of this invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on these technical teachings disclosed in this invention without departing from the essence of this invention, and these modifications and combinations are still within the scope of protection of this invention.

Claims

1. A filter-based optical communication splitting system, characterized in that, It includes a first lens (1), a second lens (2), a third lens (3), a first filter (4), a first reflector (5), a second filter (6), a second reflector (7), a third reflector (8), and a fourth lens (9); The first lens (1) converts the converged light of three wavelengths received through the ferrule into parallel light; The first filter (4) separates the main beam by reflecting parallel light. The first filter (4) has high transmission of 1310nm wavelength light and high reflection of 1270nm and 1286nm wavelength light, so as to separate the 1310nm wavelength light. The second filter (6) is used to separate 1286nm wavelength light. The second filter (6) has high transmission of 1286nm wavelength light and high reflection of 1270nm wavelength light. The second reflector (7) is used to reflect the separated 1286nm wavelength light into the second lens (2), and then into the APD; The first reflector (5) is used to reflect the separated 1270nm wavelength light into the fourth lens (9), and then into the APD; The third reflector (8) is used to reflect the separated 1310nm wavelength light into the third lens (3), and then into the APD; The APD is used to receive and convert optical signals into electrical signals.

2. The optical communication splitting system based on a filter according to claim 1, characterized in that, The reflection angles of the first filter (4) include 8°, 10° and 13°.

3. The optical communication splitting system based on a filter according to claim 1, characterized in that, The overall dimensions of the system are L7.2mm*W3.5mm.

4. The optical communication splitting system based on a filter according to claim 1, characterized in that, The dimensions of the first lens (1) are Ø1mm L0.8mm R1.9mm; The dimensions of the second lens (2) are Ø1mm L0.8mm R1.9mm; The dimensions of the third lens (3) are Ø1mm L0.8mm R1.9mm; The dimensions of the first filter (4) are L3.4mm W2.1mm H0.25mm; The dimensions of the first reflective sheet (5) are L3.4mm W2.1mm H0.20mm; The dimensions of the second filter (6) are L3.4mm W2.1mm H0.40mm; The dimensions of the second reflective sheet (7) are L3.4mm W2.1mm H0.15mm; The dimensions of the third reflective sheet (8) are L3.4mm W2.1mm H0.20mm; The dimensions of the fourth lens (9) are Ø1mm L0.8mm R1.9mm; Where Ø is the lens diameter, L is the lens or filter length, R is the lens radius of curvature, W is the filter width, and H is the filter or reflector thickness.

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