Cable television optical node of DOCSIS4.0 system

Abstract

The utility model discloses a cable television optical node of a DOCSIS4.0 system. The cable television optical node comprises a bidirectional filter circuit, an uplink amplification circuit, an optical transmitting circuit, a wavelength division multiplexer, an optical receiving circuit and a downlink amplification circuit, a mixing end of the bidirectional filter circuit is connected with a radio frequency signal of a cable television bidirectional hybrid optical fiber coaxial network of a DOCSIS4.0 system, a low frequency end of the bidirectional filter circuit is connected with an input end of the uplink amplification circuit, and an output end of the uplink amplification circuit is connected with an input end of the light emission circuit. The output end of the optical transmitting circuit is connected with the transmission end of the wavelength division multiplexer, the common end of the wavelength division multiplexer is connected with an optical signal of a cable television bidirectional hybrid optical fiber coaxial network of a DOCSIS4.0 system, the reflection end of the wavelength division multiplexer is connected with the input end of the optical receiving circuit, the output end of the optical receiving circuit is connected with the input end of the downlink amplifying circuit, and the output end of the downlink amplifying circuit is connected with the output end of the optical receiving circuit. And the output end of the downlink amplification circuit is connected with the high-frequency end of the bidirectional filter circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of cable television, in particular to a cable television optical node of a DOCSIS4.0 system. Background Art

[0002] DOCSIS4.0 is a new specification of the Cable Television Standards Organization for Hybrid Fiber / Coaxial Cable (HFC) networks. DOCSIS4.0 adds a new extended spectrum function and expands the operating frequency to 1.8 GHz, which is much higher than the 1.2 GHz currently supported by DOCSIS3.1.

[0003] As an important transmission device in the bidirectional HFC network of cable TV, optical nodes are widely used in cable TV systems. The DOCSIS3.1 optical nodes currently used in cable TV systems will not work properly and must be replaced with DOCSIS4.0 cable TV optical nodes.

[0004] Aiming at the problems existing in the prior art, a cable TV optical node of a DOCSIS4.0 system is provided. Utility Model Content

[0005] The utility model aims to provide a cable television optical node of a DOCSIS4.0 system in view of the defects of the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A cable TV optical node of a DOCSIS4.0 system, comprising a bidirectional filtering circuit, an upstream amplifying circuit, an optical transmitting circuit, a wavelength division multiplexer, an optical receiving circuit, and a downstream amplifying circuit;

[0008] The hybrid end of the bidirectional filtering circuit is connected to the radio frequency signal of the cable TV bidirectional hybrid fiber-coaxial network of the DOCSIS4.0 system, the low frequency end of the bidirectional filtering circuit is connected to the input end of the uplink amplifier circuit, the output end of the uplink amplifier circuit is connected to the input end of the optical transmitting circuit, the output end of the optical transmitting circuit is connected to the transmission end of the wavelength division multiplexer, the common end of the wavelength division multiplexer is connected to the optical signal of the cable TV bidirectional hybrid fiber-coaxial network of the DOCSIS4.0 system, the reflection end of the wavelength division multiplexer is connected to the input end of the optical receiving circuit, the output end of the optical receiving circuit is connected to the input end of the downlink amplifier circuit, and the output end of the downlink amplifier circuit is connected to the high frequency end of the bidirectional filtering circuit.

[0009] Furthermore, the model of the bidirectional filtering circuit is ZBB 5-204 / 258-1800MH.

[0010] Furthermore, the uplink amplifier circuit adopts an ASL380 amplifier chip.

[0011] Furthermore, the downlink amplifier circuit adopts an ASL560 amplifier chip.

[0012] Furthermore, the optical transmitting circuit, the optical receiving circuit, and the wavelength division multiplexer are all of the model BD-PSA-D6120B-55B-2GR.

[0013] Compared with the prior art, the cable TV optical node of the DOCSIS4.0 system of the utility model complies with the new specification of the cable TV standards organization for the hybrid fiber or coaxial cable (HFC) network DOCSIS4.0 standard, and is an important transmission device for the cable TV DOCSIS4.0 bidirectional HFC network. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a cable TV optical node of a DOCSIS 4.0 system provided in an embodiment. DETAILED DESCRIPTION

[0015] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0016] The utility model aims to provide a cable television optical node of a DOCSIS4.0 system in view of the defects of the prior art.

[0017] Example

[0018] This embodiment provides a cable TV optical node of a DOCSIS 4.0 system, such as Figure 1 As shown, it is installed at the user end of a cable TV bidirectional hybrid fiber coaxial network (i.e., a bidirectional HFC network), and includes a bidirectional filtering circuit 1, an uplink amplifier circuit 2, an optical transmitting circuit 3, a wavelength division multiplexer 4, an optical receiving circuit 5, and a downlink amplifier circuit 6.

[0019] The hybrid end of the bidirectional filtering circuit 1 is the radio frequency signal port of the DOCSIS4.0 cable TV optical node, and the hybrid end of the bidirectional filtering circuit 1 is connected to the radio frequency signal of the cable TV bidirectional HFC network of the DOCSIS4.0 system, and then receives the upstream radio frequency signal of the cable TV bidirectional HFC network; the low frequency end of the bidirectional filtering circuit 1 is connected to the input end of the upstream amplifier circuit 2, the output end of the upstream amplifier circuit 2 is connected to the input end of the optical transmitting circuit 3, the output end of the optical transmitting circuit 3 is connected to the transmission end of the wavelength division multiplexer 4, the common end of the wavelength division multiplexer 4 is the optical signal port of the DOCSIS4.0 cable TV optical node, and the common end of the wavelength division multiplexer 4 is connected to the upstream optical signal of the cable TV bidirectional HFC network of the DOCSIS4.0 system.

[0020] The bidirectional filtering circuit 1 adopts the product of Zhejiang Broadcasting Technology, model ZBB 5-204 / 258-1800MH. According to the requirements of the DOCSIS4.0 cable TV system, the operating frequency range of the upstream RF signal of the bidirectional filtering circuit 1 is 5MHz-204MHz, and the operating frequency range of the downstream RF signal is 258MHz-1800MHz. The bidirectional filtering circuit 1 has good in-band flatness, high reflection loss and mutual isolation, and low signal insertion loss.

[0021] The uplink amplifier circuit 2 adopts the ASL380 amplifier chip of ASB Company. The uplink amplifier circuit composed of this chip has the characteristics of low noise coefficient and high gain.

[0022] The downstream optical signal of the DOCSIS4.0 system is connected to the input end of the optical receiving circuit 5 through the reflection end of the wavelength division multiplexer 4, the output end of the optical receiving circuit 5 is connected to the input end of the downstream amplifier circuit 6, the output end of the downstream amplifier circuit 6 is connected to the high frequency end of the bidirectional filtering circuit 1, and the downstream radio frequency signal of the cable TV DOCSIS4.0 bidirectional HFC network is connected through the mixing end of the bidirectional filtering circuit 1.

[0023] The downstream amplifier circuit adopts the ASL560 amplifier chip of ASB Company. The downstream amplifier circuit composed of this chip has the characteristics of low noise coefficient, high gain and large output level, and is suitable for use in client products of DOCSIS4.0 system.

[0024] The optical transmitting circuit 3, the optical receiving circuit 5 and the wavelength division multiplexer 4 mainly adopt the BOSA product of the single-fiber bidirectional component of Chongqing Ousende Company, model BD-PSA-D6120B-55B-2GR. The component includes a 1610nm wavelength laser, a 1550nm wavelength PIN tube and a wavelength division multiplexer. The optical transmitting circuit, optical receiving circuit and wavelength division multiplexer composed of the component have high integration, small size and high cost performance, and are suitable for use in client products.

[0025] The cable TV optical node of the DOCSIS4.0 system of the utility model complies with the new specification of the cable TV standard organization for the hybrid fiber or coaxial cable (HFC) network DOCSIS4.0 standard, and is an important transmission device for the cable TV DOCSIS4.0 bidirectional HFC network.

[0026] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A cable TV optical node for a DOCSIS4.0 system, characterized in that: It includes a bidirectional filtering circuit, an uplink amplifying circuit, an optical transmitting circuit, a wavelength division multiplexer, an optical receiving circuit, and a downlink amplifying circuit; The hybrid end of the bidirectional filtering circuit is connected to the radio frequency signal of the cable TV bidirectional hybrid fiber-coaxial network of the DOCSIS4.0 system, the low frequency end of the bidirectional filtering circuit is connected to the input end of the uplink amplifier circuit, the output end of the uplink amplifier circuit is connected to the input end of the optical transmitting circuit, the output end of the optical transmitting circuit is connected to the transmission end of the wavelength division multiplexer, the common end of the wavelength division multiplexer is connected to the optical signal of the cable TV bidirectional hybrid fiber-coaxial network of the DOCSIS4.0 system, the reflection end of the wavelength division multiplexer is connected to the input end of the optical receiving circuit, the output end of the optical receiving circuit is connected to the input end of the downlink amplifier circuit, and the output end of the downlink amplifier circuit is connected to the high frequency end of the bidirectional filtering circuit.

2. A cable TV optical node for a DOCSIS 4.0 system according to claim 1, characterized in that: The model used in the bidirectional filtering circuit is ZBB 5-204 / 258-1800MH.

3. A cable TV optical node for a DOCSIS 4.0 system according to claim 2, characterized in that: The model of the uplink amplifier circuit is ASL380 amplifier chip.

4. A cable TV optical node for a DOCSIS 4.0 system according to claim 3, characterized in that: The model of the downlink amplifier circuit is ASL560 amplifier chip.

5. A cable TV optical node for a DOCSIS 4.0 system according to claim 4, characterized in that: The optical transmitting circuit, the optical receiving circuit and the wavelength division multiplexer all adopt the model BD-PSA-D6120B-55B-2GR.

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