A ComboPON hybrid integrated optical path

Abstract

The utility model relates to a kind of Combo PON mixed integrated optical path, comprising: polarization beam splitter, for synthesizing the light signal of two different wavebands into a signal;Glass prism, be set in the light path exit end of the polarization beam splitter;Filter, be set in the surface of the glass prism, and located in the side close to polarization beam splitter;Reflective film, be set in the surface of the glass prism, and the reflective film with the filter are respectively located in the two sides opposite to the glass prism.The utility model reduces the bandwidth requirement of 50G-PON uplink wavelength to narrowband filter, simply realizes the wavelength division multiplexing of US3 wavelength when 50G-PON / GPON coexistence by polarization beam splitter, satisfies the application demand of wavelength division multiplexing to 50G-PON.

Description

Technical Field

[0001] This utility model relates to the field of optical communication technology, and in particular to a Combo PON hybrid integrated optical path. Background Technology

[0002] Currently, gigabit broadband has become a widespread consensus and is developing rapidly. Gigabit all-optical access networks primarily utilize 10G PON technology. After years of construction, a large-scale optical access network based on PON technology and covering the entire country has been established. By the end of 2022, the number of 10G PON ports in China reached 15.23 million. 50G-PON, as the next-generation high-speed PON technology, is a key technology for realizing the foundation of 10-gigabit optical access networks. At the same time, the upgrade and evolution of 50G-PON technology also needs to ensure its coexistence with existing PON networks, enable smooth user upgrades, save investment, simplify operation and maintenance, and reduce energy consumption, thus guaranteeing the sustainable evolution of operators' large-scale 10G PON networks. In current GPON / XG(S)-PON networks typically use Class C+ (32dB) link budgets. Therefore, 50G-PON should employ US3 (1284-1288 nm) wavelength options and optical devices supporting a 32dB link budget, achieving coexistence with existing GPON and XG(S)-PON networks through wavelength division multiplexing (WDM). From the perspective of network coexistence and evolution, one of the technical challenges of 50G-PON is the mere 2nm isolation band between it and the 1290nm wavelength boundary of GPON. This presents significant challenges to the functional design and mass production processes of passive devices, especially the passband area and accuracy of optical filters. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the requirement of narrowband filters for the uplink wavelength of 50G-PON in the prior art, and to provide a Combo PON hybrid integrated optical path, which simply realizes wavelength division multiplexing of US3 wavelength when 50G-PON / GPON coexist through a polarization beam splitter, thus meeting the application requirements of 50G-PON for wavelength division multiplexing.

[0004] To solve the above-mentioned technical problems, this utility model provides a Combo PON hybrid integrated optical path, comprising:

[0005] A polarization beam splitter is used to combine optical signals from different wavelengths into a single signal.

[0006] A glass prism is disposed at the optical path output end of the polarizing beam splitter;

[0007] A filter is disposed on the surface of the glass prism and located on the side close to the polarizing beam splitter;

[0008] A reflective film is disposed on the surface of the glass prism, and the reflective film and the filter are respectively located on opposite sides of the glass prism.

[0009] In one embodiment of this invention, the number of filters is greater than or equal to the number of light waves of different wavelengths in the optical signal.

[0010] In one embodiment of this utility model, the filter includes a first filter, a second filter, a third filter, a fourth filter, and a fifth filter, and the five filters are all spaced apart and disposed on the same side of the glass prism.

[0011] In one embodiment of this utility model, the first filter and the second filter are used to receive uplink optical signals, and the third filter, the fourth filter and the fifth filter are used to receive downlink optical signals.

[0012] In one embodiment of this invention, the passband region of the first filter is 1284nm-1330nm. The wavelength range of the optical signal synthesized by the polarizing beam splitter is 1284nm-1330nm, and it propagates inside the glass prism after passing through the first filter.

[0013] In one embodiment of this invention, the passband region of the second filter is 1260nm-1280nm. Optical signals with a wavelength range of 1260nm-1280nm pass through the second filter and propagate within the glass prism. The second filter also reflects the optical signals reflected from the reflective film, and then transmits both signals together to the reflective film.

[0014] In one embodiment of this invention, the passband region of the third filter is 1340nm-1344nm. The third filter transmits light signals with wavelengths in the range of 1340nm-1344nm that have been reflected by the second filter and the reflective film, and reflects the remaining light signals outside the wavelength range back to the reflective film.

[0015] In one embodiment of this invention, the passband region of the fourth filter is 1480nm-1500nm. The fourth filter transmits light signals within the wavelength range of 1480nm-1500nm that have been reflected by the third filter and the reflective film, while reflecting the remaining light signals outside the wavelength range back to the reflective film.

[0016] In one embodiment of this invention, the passband region of the fifth filter is 1575nm-1580nm. The fifth filter transmits light signals with wavelengths in the range of 1575nm-1580nm that have been reflected by the fourth filter and the reflective film, while reflecting the remaining light signals outside the wavelength range, and finally emits them out of the glass prism.

[0017] In one embodiment of this utility model, the polarizing beam splitter is disposed at the front end of the first filter, and the first filter receives the synthesized signal of the polarizing beam splitter and sends the optical signal into the glass prism for propagation.

[0018] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0019] The Combo PON hybrid integrated optical path described in this utility model has a compact structure and simple manufacturing process. It combines optical signals from two wavelength bands into a single optical signal by using a polarization beam splitter before sending it into a glass prism. This simple method achieves wavelength division multiplexing of the US3 wavelength when 50G-PON / GPON coexists, meets the application requirements of 50G-PON for wavelength division multiplexing, and reduces the bandwidth requirements of narrowband filters for the uplink wavelength of 50G-PON. Attached Figure Description

[0020] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of the Combo PON hybrid integrated optical path in a preferred embodiment of this utility model.

[0022] Explanation of reference numerals in the accompanying drawings: 1-glass prism, 2-polarizing beam splitter, 3-reflective film, 4-first filter, 5-second filter, 6-third filter, 7-fourth filter, 8-fifth filter. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0024] Reference Figure 1As shown, this utility model discloses a Combo PON hybrid integrated optical path, comprising: a polarizing beam splitter 2 for combining optical signals of different wavelengths into a single signal; a glass prism 1 disposed at the optical output end of the polarizing beam splitter 2; an incident channel provided on the glass prism 1; a filter disposed on the surface of the glass prism 1 and located on the side close to the polarizing beam splitter 2; and a reflective film 3 disposed on the surface of the glass prism 1, with the reflective film 3 and the filter respectively located on opposite sides of the glass prism 1.

[0025] In this embodiment, the Combo PON hybrid integrated optical path uses polarization beam splitter 2 to combine optical signals from two bands into a single optical signal before sending it into glass prism 1. This simplifies the wavelength division multiplexing of the US3 wavelength when 50G-PON / GPON coexists, meets the application requirements of 50G-PON for wavelength division multiplexing, and reduces the bandwidth requirements of the 50G-PON uplink wavelength on the narrowband filter.

[0026] To ensure that light waves of each wavelength can be filtered out, the number of filters is greater than or equal to the number of light waves of different wavelengths in the optical signal. Preferably, the filters include a first filter 4, a second filter 5, a third filter 6, a fourth filter 7, and a fifth filter 8, and all five filters are disposed on the same side of the glass prism 1 and are spaced apart on the surface of the glass prism 1.

[0027] In this embodiment, the first filter 4 and the second filter 5 are used to receive uplink optical signals, and the third filter 6, the fourth filter 7, and the fifth filter 8 are used to receive downlink optical signals.

[0028] In this embodiment, the passband region of the first filter 4 is 1284nm-1330nm. The passband region of the second filter 5 is 1260nm-1280nm. The passband region of the third filter 6 is 1340nm-1344nm. The passband region of the fourth filter 7 is 1480nm-1500nm; and the passband region of the fifth filter 8 is 1575nm-1580nm.

[0029] Preferably, the polarizing beam splitter 2 is disposed at the front end of the first filter 4. The first filter 4 receives the synthesized optical signal from the polarizing beam splitter 2 and sends the optical signal into the glass prism 1. When the optical signal in the 1290nm-1330nm band is a P-wave and the optical signal in the 1284nm-1288nm band is an S-wave, the optical signals of the two bands are synthesized into one optical signal by the polarizing beam splitter 2, and then enter the glass prism 1 through the first filter 4. After being reflected by the reflective film 3, it continues to propagate in the glass prism 1, reaches the other filters, and is reflected. The optical signals of other bands are transmitted through the second filter 5 and enter the glass prism 1. They propagate in the glass prism 1 together with the optical signals reflected by the filters. Therefore, optical signals with wavelengths within the passband of the filters are transmitted to form the outgoing optical signal, realizing wavelength division multiplexing of optical signals of different bands.

[0030] Specifically, P-waves and S-waves are combined into a single signal by polarization beam splitter 2. The wavelength range of this optical signal is 1284nm-1330nm. This signal passes through the first filter 4 and enters the glass prism 1 to form the first optical signal. Other wavelength range optical signals, specifically those between 1260nm and 1280nm, pass through the second filter 5 and enter the glass prism 1 to form the second optical signal. The first optical signal is reflected by the reflective film 3 to the second filter 5 and then reflected again. The second optical signal, along with the first optical signal, is reflected by the reflective film 3 to the third filter 6, with a wavelength range of 1340nm-... The light signal within 1344nm is transmitted through the third filter 6. The remaining light signal is reflected by the third filter 6 to the reflective film 3. Then the reflective film 3 reflects the light signal to the fourth filter 7. The light signal with a wavelength range of 1480nm-1500nm is transmitted through the fourth filter 7. The remaining signal is reflected by the fourth filter 7 to the reflective film 3. The reflective film 3 then reflects the light signal to the fifth filter 8. The light signal with a wavelength range of 1575nm-1580nm is transmitted through the fifth filter 8. The remaining light signal is reflected by the fifth filter 8 and finally transmitted through the glass prism 1.

[0031] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A Combo PON hybrid integrated optical circuit, characterized by: include: A polarization beam splitter is used to combine two optical signals from different wavelengths into a single signal. A glass prism is disposed at the optical path output end of the polarizing beam splitter; A filter is disposed on the surface of the glass prism and located on the side close to the polarizing beam splitter; A reflective film is disposed on the surface of the glass prism, and the reflective film and the filter are respectively located on opposite sides of the glass prism.

2. The Combo PON hybrid integrated optical path according to claim 1, characterized in that: The number of filters is greater than or equal to the number of light waves of different wavelengths in the optical signal.

3. The Combo PON hybrid integrated optical path according to claim 2, characterized in that: The filters include a first filter, a second filter, a third filter, a fourth filter, and a fifth filter, and all five filters are spaced apart and arranged on the same side of the glass prism.

4. The Combo PON hybrid integrated optical path according to claim 3, characterized in that: The first and second filters are used to receive uplink optical signals, and the third, fourth, and fifth filters are used to receive downlink optical signals.

5. The Combo PON hybrid integrated optical path according to claim 4, characterized in that: The passband region of the first filter is 1284nm-1330nm.

6. The Combo PON hybrid integrated optical path according to claim 4, characterized in that: The passband region of the second filter is 1260nm-1280nm.

7. The Combo PON hybrid integrated optical path according to claim 4, characterized in that: The passband region of the third filter is 1340nm-1344nm.

8. The Combo PON hybrid integrated optical path according to claim 4, characterized in that: The passband region of the fourth filter is 1480nm-1500nm.

9. The Combo PON hybrid integrated optical path according to claim 4, characterized in that: The passband region of the fifth filter is 1575nm-1580nm.

10. The Combo PON hybrid integrated optical path according to claim 3, characterized in that: The polarizing beam splitter is located at the front end of the first filter. It receives the combined signal from the polarizing beam splitter through the first filter and sends the optical signal into the glass prism for propagation.

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