Cable television optical workstation of DOCSIS4.0 system

Abstract

The utility model discloses a cable television optical workstation of a DOCSIS4.0 system. Comprising an optical receiving circuit, a first downlink amplification circuit, a downlink equalization circuit, a first downlink attenuation circuit, a second downlink amplification circuit, a downlink distribution circuit, a second downlink attenuation circuit, a third downlink attenuation circuit, a third downlink amplification circuit, a fourth downlink amplification circuit, a first bidirectional filter circuit, a second bidirectional filter circuit and a first uplink attenuation circuit. The system comprises a first uplink attenuation circuit, a second uplink attenuation circuit, an uplink hybrid circuit, a first uplink amplification circuit, a third uplink attenuation circuit, a second uplink amplification circuit and a light emission circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of cable television, in particular to a cable television optical workstation 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 workstations currently used in cable TV systems will not work properly and must be replaced with DOCSIS4.0 cable TV optical workstations.

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

[0005] The utility model aims to provide a cable television optical workstation 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 workstation of a DOCSIS4.0 system comprises an optical receiving circuit, a first downstream amplifying circuit, a downstream equalizing circuit, a first downstream attenuating circuit, a second downstream amplifying circuit, a downstream distributing circuit, a second downstream attenuating circuit, a third downstream attenuating circuit, a third downstream amplifying circuit, a fourth downstream amplifying circuit, a first bidirectional filtering circuit, a second bidirectional filtering circuit, a first upstream attenuating circuit, a second upstream attenuating circuit, an upstream mixing circuit, a first upstream amplifying circuit, a third upstream attenuating circuit, a second upstream amplifying circuit, and an optical transmitting circuit;

[0008] The input end of the optical receiving circuit is connected to the downlink optical input signal of the DOCSIS4.0 system cable TV bidirectional hybrid fiber-coaxial network, the output end of the optical receiving circuit is connected to the input end of the first downlink amplifier circuit, the output end of the first downlink amplifier circuit is connected to the input end of the downlink equalizer circuit, the output end of the downlink equalizer circuit is connected to the input end of the first downlink attenuation circuit, the output end of the first downlink attenuation circuit is connected to the input end of the second downlink amplifier circuit, the output end of the second downlink amplifier circuit is connected to the input end of the downlink distribution circuit, one output end of the downlink distribution circuit is connected to the input end of the second downlink attenuation circuit, and the other output end of the downlink distribution circuit is connected to the third downlink The input end of the attenuation circuit is connected, the output end of the second downstream attenuation circuit is connected to the input end of the third downstream amplification circuit, the output end of the third downstream amplification circuit is connected to the high frequency end of the first bidirectional filtering circuit, and the hybrid end of the first bidirectional filtering circuit is connected to the downstream RF signal output end of the DOCSIS4.0 system cable TV bidirectional hybrid fiber-coaxial network; the output end of the third downstream attenuation circuit is connected to the input end of the fourth downstream amplification circuit, the output end of the fourth downstream amplification circuit is connected to the high frequency end of the second bidirectional filtering circuit, and the hybrid end of the second bidirectional filtering circuit is connected to the downstream RF signal output end of the DOCSIS4.0 system cable TV bidirectional hybrid fiber-coaxial network;

[0009] The low frequency end of the first bidirectional filtering circuit is connected to the input end of the first uplink attenuation circuit, the output end of the first uplink attenuation circuit is connected to one input end of the uplink mixing circuit, the low frequency end of the second bidirectional filtering circuit is connected to the input end of the second uplink attenuation circuit, the output end of the second uplink attenuation circuit is connected to the other input end of the uplink mixing circuit, the output end of the uplink mixing circuit is connected to the input end of the first uplink amplification circuit, the output end of the first uplink amplification circuit is connected to the input end of the third uplink attenuation circuit, the output end of the third uplink attenuation circuit is connected to the input end of the second uplink amplification circuit, the output end of the second uplink amplification circuit is connected to the input end of the optical transmission circuit, and the output end of the optical transmission circuit is connected to the uplink optical output signal of the DOCSIS4.0 cable TV bidirectional hybrid fiber-coaxial network.

[0010] Furthermore, the optical receiving circuit adopts a model BLPD-PSA1-75AR.

[0011] Furthermore, the model of the first downstream amplifier circuit is ZD1037.

[0012] Furthermore, the downstream equalization circuit, the first downstream attenuation circuit, the second downstream attenuation circuit, the third downstream attenuation circuit, the first upstream attenuation circuit, the second upstream attenuation circuit, and the third upstream attenuation circuit all use passive pluggable devices.

[0013] Furthermore, the second downlink amplifier circuit and the first uplink amplifier circuit both use models ZD1020.

[0014] Furthermore, the models used by the downlink distribution circuit and the uplink mixing circuit are both B015-617DS-1007-C331.

[0015] Furthermore, the third downstream amplifier circuit and the fourth downstream amplifier circuit both use QPL1820.

[0016] Furthermore, the first bidirectional filtering circuit and the second bidirectional filtering circuit both use models of ZBB 5-204 / 258-1800MH.

[0017] Furthermore, the model of the second uplink amplifier circuit is SMG3302R.

[0018] Furthermore, the optical transmission circuit adopts a model BLLD-PSA2-D6120B-2GR.

[0019] Compared with the prior art, the cable TV optical workstation of the DOCSIS4.0 system of the utility model complies with the new specification of the cable TV standards organization for the DOCSIS4.0 standard of the hybrid fiber or coaxial cable (HFC) network, and is an important transmission equipment for the cable TV DOCSIS4.0 bidirectional HFC network. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of a cable TV optical workstation of a DOCSIS4.0 system provided in an embodiment. DETAILED DESCRIPTION

[0021] 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.

[0022] The utility model aims to provide a cable television optical workstation of a DOCSIS4.0 system in view of the defects of the prior art.

[0023] Example

[0024] This embodiment provides a cable television optical workstation of a DOCSIS4.0 system, such as Figure 1As shown, it is installed in a cable TV bidirectional hybrid fiber-coaxial network (i.e., a bidirectional HFC network), and includes an optical receiving circuit 1, a first downstream amplifier circuit 2, a downstream equalizing circuit 3, a first downstream attenuation circuit 4, a second downstream amplifier circuit 5, a downstream distribution circuit 6, a second downstream attenuation circuit 7, a third downstream attenuation circuit 8, a third downstream amplifier circuit 9, a fourth downstream amplifier circuit 10, a first bidirectional filtering circuit 11, a second bidirectional filtering circuit 12, a first upstream attenuation circuit 13, a second upstream attenuation circuit 14, an upstream mixing circuit 15, a first upstream amplifier circuit 16, a third upstream attenuation circuit 17, a second upstream amplifier circuit 18, and an optical transmitting circuit 19.

[0025] The input end of the optical receiving circuit 1 is an optical input signal port, which is connected to the downstream optical input signal of the DOCSIS4.0 system cable TV bidirectional HFC network, and then receives the downstream optical input signal of the DOCSIS4.0 cable TV bidirectional HFC network; the output end of the optical receiving circuit 1 is connected to the input end of the first downstream amplifier circuit 2, the output end of the first downstream amplifier circuit 2 is connected to the input end of the downstream equalization circuit 3, the output end of the downstream equalization circuit 3 is connected to the input end of the first downstream attenuation circuit 4, the output end of the first downstream attenuation circuit 4 is connected to the input end of the second downstream amplifier circuit 5, and the second downstream amplifier circuit 5 is connected to the input end of the first downstream attenuation circuit 4. The output end of circuit 5 is connected to the input end of downstream distribution circuit 6, one output end of downstream distribution circuit 6 is connected to the input end of second downstream attenuation circuit 7, the other output end of downstream distribution circuit 6 is connected to the input end of third downstream attenuation circuit 8, the output end of second downstream attenuation circuit 7 is connected to the input end of third downstream amplifier circuit 9, the output end of third downstream amplifier circuit 9 is connected to the high frequency end of first bidirectional filtering circuit 11, the mixing end of first bidirectional filtering circuit 11 is the first RF signal port, the first RF signal port is connected to the downstream RF signal output end of DOCSIS4.0 system cable TV bidirectional HFC network.

[0026] The output end of the third downstream attenuation circuit 8 is connected to the input end of the fourth downstream amplifier circuit 10, the output end of the fourth downstream amplifier circuit 10 is connected to the high frequency end of the second bidirectional filtering circuit 12, the mixing end of the second bidirectional filtering circuit is the second RF signal port, and the second RF signal port is connected to the downstream RF signal output end of the DOCSIS4.0 system cable TV bidirectional HFC network.

[0027] The optical receiving circuit 1 adopts the photoelectric tube of Xiamen Bailai Company, model BLPD-PSA1-75AR, a coaxial small package, with the characteristics of high responsiveness, low dark current and return loss.

[0028] The first downstream amplifier circuit 2 uses a low noise coefficient, high linearity amplifier chip from Beijing Zhongdian Hongye, model ZD1037, with an operating frequency range of 50MHz-4000MHz and a gain of 26dB.

[0029] The downstream equalization circuit 3, the first downstream attenuation circuit 4, the second downstream attenuation circuit 7, and the third downstream attenuation circuit 8 all use passive pluggable devices from Ningbo Fenghua Yinxin. Different passive pluggable equalizers or attenuators can be selected according to different equalization amounts or attenuation amounts. The operating frequency range is 5MHz-1800MHz.

[0030] The second downlink amplifier circuit 5 uses the ZD1020 high linearity power amplifier chip of Beijing Zhongdian Hongye, which is manufactured using gallium arsenide (GaAs) technology, has an operating frequency range of 5MHz-3000MHz, a gain of 21dB, and has the advantages of low noise, high gain, high linearity, etc. It uses a dynamic bias circuit inside to overcome the adverse effects of temperature changes.

[0031] The downlink distribution circuit 6 adopts the RF power divider of Zhuhai Dongheng Electronics, model B015-617DS-1007-C331, with an operating frequency range of 5MHz-1900MHz.

[0032] The third downstream amplifier circuit 9 and the fourth downstream amplifier circuit 10 use the power amplifier chip of QORVO of the United States, model QPL1820, which is a GaAs pHEMT RF amplifier with ultra-high linearity index, supporting broadband DOCSIS 4.0 cable TV system applications, with an operating frequency range of 5MHz-1800MHz and a gain of 22dB.

[0033] The first bidirectional filtering circuit 11 and the second bidirectional filtering circuit 12 are both products of Zhejiang Broadcasting Technology, model ZBB5-204 / 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 is 5MHz-204MHz, and the operating frequency range of the downstream RF signal is 258MHz-1800MHz. The bidirectional filtering circuit has good in-band flatness, high reflection loss and mutual isolation, and low signal insertion loss.

[0034] The uplink RF signal of the DOCSIS4.0 cable TV bidirectional HFC network is connected to the first bidirectional filtering circuit 11 via the first RF signal port, the low frequency end of the first bidirectional filtering circuit 11 is connected to the input end of the first uplink attenuation circuit 13, and the output end of the first uplink attenuation circuit 13 is connected to an input end of the uplink mixing circuit 15. The uplink RF signal of the DOCSIS4.0 cable TV bidirectional HFC network is connected to the second bidirectional filtering circuit 12 via the second RF signal port, the low frequency end of the second bidirectional filtering circuit 12 is connected to the input end of the second uplink attenuation circuit 14, the output end of the second uplink attenuation circuit 14 is connected to another input end of the uplink mixing circuit 15, the output end of the uplink mixing circuit 15 is connected to the input end of the first uplink amplifier circuit 16, the output end of the first uplink amplifier circuit 16 is connected to the input end of the third uplink attenuation circuit 17, the output end of the third uplink attenuation circuit 17 is connected to the input end of the second uplink amplifier circuit 18, the output end of the second uplink amplifier circuit 18 is connected to the input end of the optical transmitting circuit 19, the output end of the optical transmitting circuit 19 is an optical output port, the optical output port is connected to the uplink optical output signal of the DOCSIS4.0 cable TV bidirectional HFC network, and then the uplink optical output signal of the DOCSIS4.0 cable TV bidirectional HFC network is transmitted.

[0035] The first uplink attenuation circuit 13, the second uplink attenuation circuit 14 and the third uplink attenuation circuit 17 all adopt passive pluggable devices of Ningbo Fenghua Yinxin. Different passive pluggable attenuators can be selected according to different attenuation amounts. The operating frequency range is 5MHz-1800MHz.

[0036] The uplink mixing circuit 15 adopts the RF power mixer of Zhuhai Dongheng Electronics, model B015-617DS-1007-C331, with an operating frequency range of 5MHz-1900MHz.

[0037] The first uplink amplifier circuit 16 adopts the ZD1020 high linearity power amplifier chip of Beijing Zhongdian Hongye, which is manufactured using gallium arsenide (GaAs) technology, has an operating frequency range of 5MHz-3000MHz, a gain of 21dB, and has the advantages of low noise, high gain, and high linearity.

[0038] The second uplink amplifier circuit 18 adopts the Shenzhen Vanward Technology SMG3302R high linearity power amplifier module with an operating bandwidth of 5-300MHz and a gain of 30dB.

[0039] The optical transmission circuit 19 adopts the DFB laser of Xiamen Bailai Company, the model is

[0040] BLLD-PSA2-D6120B-2GR, coaxial small package, high cost performance.

[0041] The cable TV optical workstation of the DOCSIS4.0 system of the utility model complies with the new specification of the cable TV standard organization for the hybrid optical fiber or coaxial cable (HFC) network DOCSIS4.0 standard, and is an important transmission device for the cable TV DOCSIS4.0 bidirectional HFC network.

[0042] 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 workstation for a DOCSIS4.0 system, characterized in that: It includes an optical receiving circuit, a first downstream amplifying circuit, a downstream equalizing circuit, a first downstream attenuating circuit, a second downstream amplifying circuit, a downstream allocating circuit, a second downstream attenuating circuit, a third downstream attenuating circuit, a third downstream amplifying circuit, a fourth downstream amplifying circuit, a first bidirectional filtering circuit, a second bidirectional filtering circuit, a first upstream attenuating circuit, a second upstream attenuating circuit, an upstream mixing circuit, a first upstream amplifying circuit, a third upstream attenuating circuit, a second upstream amplifying circuit, and an optical transmitting circuit; The input end of the optical receiving circuit is connected to the downlink optical input signal of the DOCSIS4.0 system cable TV bidirectional hybrid fiber-coaxial network, the output end of the optical receiving circuit is connected to the input end of the first downlink amplifier circuit, the output end of the first downlink amplifier circuit is connected to the input end of the downlink equalizer circuit, the output end of the downlink equalizer circuit is connected to the input end of the first downlink attenuation circuit, the output end of the first downlink attenuation circuit is connected to the input end of the second downlink amplifier circuit, the output end of the second downlink amplifier circuit is connected to the input end of the downlink distribution circuit, one output end of the downlink distribution circuit is connected to the input end of the second downlink attenuation circuit, and the other output end of the downlink distribution circuit is connected to the third downlink The input end of the attenuation circuit is connected, the output end of the second downstream attenuation circuit is connected to the input end of the third downstream amplification circuit, the output end of the third downstream amplification circuit is connected to the high frequency end of the first bidirectional filtering circuit, and the hybrid end of the first bidirectional filtering circuit is connected to the downstream RF signal output end of the DOCSIS4.0 system cable TV bidirectional hybrid fiber-coaxial network; the output end of the third downstream attenuation circuit is connected to the input end of the fourth downstream amplification circuit, the output end of the fourth downstream amplification circuit is connected to the high frequency end of the second bidirectional filtering circuit, and the hybrid end of the second bidirectional filtering circuit is connected to the downstream RF signal output end of the DOCSIS4.0 system cable TV bidirectional hybrid fiber-coaxial network; The low frequency end of the first bidirectional filtering circuit is connected to the input end of the first uplink attenuation circuit, the output end of the first uplink attenuation circuit is connected to one input end of the uplink mixing circuit, the low frequency end of the second bidirectional filtering circuit is connected to the input end of the second uplink attenuation circuit, the output end of the second uplink attenuation circuit is connected to the other input end of the uplink mixing circuit, the output end of the uplink mixing circuit is connected to the input end of the first uplink amplification circuit, the output end of the first uplink amplification circuit is connected to the input end of the third uplink attenuation circuit, the output end of the third uplink attenuation circuit is connected to the input end of the second uplink amplification circuit, the output end of the second uplink amplification circuit is connected to the input end of the optical transmission circuit, and the output end of the optical transmission circuit is connected to the uplink optical output signal of the DOCSIS4.0 cable TV bidirectional hybrid fiber-coaxial network.

2. A cable TV optical workstation for a DOCSIS 4.0 system according to claim 1, characterized in that: The model of the optical receiving circuit is BLPD-PSA1-75AR.

3. A cable TV optical workstation for a DOCSIS 4.0 system according to claim 2, characterized in that: The model used by the first downstream amplifier circuit is ZD1037.

4. A cable TV optical workstation for a DOCSIS 4.0 system according to claim 3, characterized in that: The downlink equalization circuit, the first downlink attenuation circuit, the second downlink attenuation circuit, the third downlink attenuation circuit, the first uplink attenuation circuit, the second uplink attenuation circuit, and the third uplink attenuation circuit all adopt passive pluggable components.

5. A cable TV optical workstation for a DOCSIS 4.0 system according to claim 4, characterized in that: The second downlink amplifier circuit and the first uplink amplifier circuit both use models ZD1020.

6. A cable television optical workstation for a DOCSIS 4.0 system according to claim 5, characterized in that: The models used by the downlink distribution circuit and the uplink mixing circuit are both B015-617DS-1007-C331.

7. A cable television optical workstation for a DOCSIS 4.0 system according to claim 6, characterized in that: The third downstream amplifier circuit and the fourth downstream amplifier circuit both use QPL1820.

8. A cable television optical workstation for a DOCSIS 4.0 system according to claim 7, characterized in that: The first bidirectional filtering circuit and the second bidirectional filtering circuit both use the model ZBB 5-204 / 258-1800MH.

9. A cable television optical workstation for a DOCSIS 4.0 system according to claim 8, characterized in that: The model used by the second uplink amplifier circuit is SMG3302R.

10. A cable TV optical workstation of a DOCSIS 4.0 system according to claim 9, characterized in that: The model of the optical transmission circuit is BLLD-PSA2-D6120B-2GR.

Images