WO2020108561A1 - 一种视频接收光模块及光网络单元 - Google Patents

一种视频接收光模块及光网络单元 Download PDF

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Publication number
WO2020108561A1
WO2020108561A1 PCT/CN2019/121584 CN2019121584W WO2020108561A1 WO 2020108561 A1 WO2020108561 A1 WO 2020108561A1 CN 2019121584 W CN2019121584 W CN 2019121584W WO 2020108561 A1 WO2020108561 A1 WO 2020108561A1
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Prior art keywords
optical
optical fiber
fiber interface
catv
light
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PCT/CN2019/121584
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English (en)
French (fr)
Inventor
王力
张春刚
李福宾
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Hisense Broadband Multimedia Technology Co Ltd
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Hisense Broadband Multimedia Technology Co Ltd
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Publication of WO2020108561A1 publication Critical patent/WO2020108561A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • H04B10/25752—Optical arrangements for wireless networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • H04B10/25752—Optical arrangements for wireless networks
    • H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/22—Adaptations for optical transmission

Definitions

  • the present application relates to the technical field of optical communication, in particular to a video receiving optical module and an optical network unit.
  • the optical modem or optical cat, is a light transmission device developed for special user environments.
  • the device uses a large-scale integrated chip, which has simple circuits, low power consumption, high reliability, complete alarm status indication and a complete network. Management functions.
  • Most optical cats are connected to PON (Passive Optical Network, passive optical network), and can also be connected to CATV (Community Antenna Television) according to their needs.
  • PON Passive Optical Network, passive optical network
  • CATV Common Antenna Television
  • the conventional access CATV application optical cat includes two modes, one is a plug-in three-way optical module is plugged or soldered on the optical cat, the core device of the three-way optical module is a three-way optical component, which is passed CWDM ( Coarse Wavelength Division Multiplexing (coarse wavelength division multiplexer) multiplexes the upstream digital transmission, downstream digital transmission and analog CATV three-way transmission into one direction transmission, which mainly completes the demultiplexing/combining and the photoelectric signal conversion required by the module;
  • CWDM Coarse Wavelength Division Multiplexing (coarse wavelength division multiplexer) multiplexes the upstream digital transmission, downstream digital transmission and analog CATV three-way transmission into one direction transmission, which mainly completes the demultiplexing/combining and the photoelectric signal conversion required by the module
  • the other is a new BOB (BOSA on Board, optical transceiver module component on board technology) solution, that is, the PON component and the CATV component are directly integrated on the optical cat equipment
  • the present application provides a video receiving optical module and an optical network unit to solve the technical problem of inflexible application of the access CATV, which causes a decrease in user experience.
  • an embodiment of the present application discloses a video receiving optical module, including: a PCB board, a first optical fiber interface and a second optical fiber interface, wherein,
  • the PCB board is provided with a light receiving component, and the first optical fiber interface and the second optical fiber interface are respectively connected to the input end of the light receiving component through optical fibers;
  • the light receiving component includes a filter and a light receiving device, and the CATV light input through the first optical fiber interface is received by the light receiving device through the filter;
  • the downstream PON light input through the first optical fiber interface is reflected by the filter to the second optical fiber interface.
  • the light receiving device includes a module circuit for converting the CATV light into a CATV electrical signal.
  • the light receiving assembly further includes a glass capillary, the glass capillary is located between the first optical fiber interface and the filter sheet;
  • optical fiber connecting the first optical fiber interface and the light receiving component and the optical fiber connecting the second optical fiber interface and the light receiving component are fixed in the glass capillary.
  • it further includes a video output terminal, and the input end of the video output terminal is connected to the output end of the light receiving device.
  • a power amplifier is provided between the light receiving component and the video output terminal, the output end of the light receiving device is connected to the input end of the power amplifier, and the output end of the power amplifier is connected to the Connect the video output terminal.
  • the power amplifier includes a first power amplifier and a second power amplifier, the input end of the first power amplifier is connected to the output end of the optical receiving device, and the output end of the first power amplifier is connected to all The input terminal of the second power amplifier is connected, and the output terminal of the second power amplifier is connected to the video output terminal.
  • an automatic gain controller is provided between the first power amplifier and the second power amplifier, an input end of the automatic gain controller is connected to an output end of the first power amplifier, the automatic The output terminal of the gain controller is connected to the input terminal of the second power amplifier.
  • an embodiment of the present application further discloses an optical network unit, including a video receiving optical module and a PON optical module.
  • the second optical fiber interface of the video receiving optical module is connected to the PON optical module through an optical fiber.
  • the video receiving optical module is the video receiving optical module described in the first aspect.
  • the upstream PON light emitted by the PON optical module is input to the video receiving optical module through the second optical fiber interface, and the upstream PON light is reflected by the filter to the first optical fiber interface of the video receiving optical module .
  • the video receiving optical module provided by this application can be flexibly inserted into an optical network unit.
  • the video receiving optical module is provided with a first optical fiber interface and a second optical fiber interface.
  • the first optical fiber interface is connected to an external optical fiber and receives CATV light and PON light transmitted by the external optical fiber , CATV light input through the first optical fiber interface is received by the light receiving device through the filter; and PON light input through the first optical fiber interface is reflected by the filter to the second optical fiber interface, so that the CATV light and PON light in the external fiber Can be separated.
  • FIG. 1 is a schematic structural diagram of a video receiving optical module provided by an embodiment of this application.
  • FIG. 2 is a schematic diagram of installation of a video receiving optical module provided by an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of another video receiving optical module provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of optical path transmission of an optical network unit provided by an embodiment of the present application.
  • Most home optical network units are in the form of PON (Passive Optical Network, passive optical network), that is, the optical network unit is integrated with a PON optical module, and the PON function of the optical network unit is realized through the PON optical module.
  • PON Passive Optical Network, passive optical network
  • CATV Common Antenna Television
  • the optical network unit integrates the CATV optical module, it will always have the CATV function, so according to the existence of two types of optical network units on the market, one has only the PON function and the other has both the PON function and the CATV function.
  • the optical network unit with PON function can be replaced with an optical network unit with PON function and CATV function.
  • the application is inflexible and affects user experience evaluation.
  • the embodiments of the present application provide a video receiving optical module, which can be flexibly inserted into an optical network unit.
  • a video receiving optical module which can be flexibly inserted into an optical network unit.
  • the video receiving optical module provided by the embodiment of the present application is specifically a CATV optical module.
  • the CATV optical module and the optical network unit are disassembled and assembled according to actual needs, and the CATV function and PON of the optical network unit can be realized without replacing the optical network unit Features.
  • FIG. 1 it is a schematic structural diagram of a video receiving optical module provided by an embodiment of the present application.
  • the video receiving optical module provided in the embodiment of the present application, that is, the CATV optical module, includes a PCB board, a first optical fiber interface 11 and a second optical fiber interface 12, wherein,
  • a light receiving component 1 is provided on the PCB, and the first optical fiber interface 11 and the second optical fiber interface 12 are connected to the input end of the light receiving component 1 through optical fibers, respectively.
  • the first optical fiber interface 11 is connected to the external optical port 7 of the optical network unit.
  • the external optical fiber transmitting the optical signal is also connected to the external optical port 7, so the light transmitted by the external optical fiber enters the light receiving component 1 through the external optical port 7 and the first optical fiber interface 11.
  • the light receiving assembly 1 includes a filter 14 and a light receiving device 15, and the filter 14 is located on the light propagation path between the first optical fiber interface 11 and the light receiving device 15.
  • the light receiving device 15 is used to convert the CATV optical signal into a CATV electrical signal for the television to receive the CATV electrical signal to realize the CATV function.
  • the filter 14 can transmit CATV light and reflect PON light through the multilayer reflective and transmissive film structure coated on its surface.
  • the surface of the filter 14 should be coated with a film that transmits light at a wavelength of 1550 nm; and a film that reflects light at a wavelength of 1490 nm.
  • the CATV light After the CATV light input through the first optical fiber interface 11 enters the light receiving assembly 1, the CATV light passes through the filter 14 and is received by the light receiving device 15.
  • the light receiving device 15 has a built-in module circuit to convert the CATV optical signal into a CATV electrical signal. Finally, the output end of the light receiving device 15 transmits the CATV electrical signal to the television, so that the television receives the CATV electrical signal and plays its corresponding video program.
  • the CATV optical module provided by the embodiment of the present application further includes a video output terminal 5.
  • the input terminal of the video output terminal 5 is connected to the output terminal of the light receiving device 15, and is used to output the converted CATV electrical signal to In the TV, the TV is connected to the CATV electrical signal.
  • the downstream PON light input through the first optical fiber interface 11 enters the light receiving component 1, the PON light is reflected by the filter 14 to the second optical fiber interface 12, and cannot be received by the light receiving device 15, so the CATV optical module is only used to process CATV Light.
  • the downstream PON light is 1490nm light.
  • the filter 14 may not be provided in the light receiving component 1, and the CATV light transmitted by the external optical fiber directly enters the light receiving device 15 through the first fiber interface 11 and receives light through the light
  • the device 15 converts the CATV light into a CATV electrical signal to transmit the CATV electrical signal to the television. If the external optical fiber transmits CATV light and PON light at the same time, it is necessary to provide a filter 14 in the light receiving component 1 to prevent the PON light from entering the light receiving device 15 through the filter 14 to prevent the PON light from interfering with the transmission of CATV optical signals and improving video playback quality.
  • the CATV optical module provided by the embodiment of the present application includes a PCB board, a first optical fiber interface 11 and a second optical fiber interface 12, the PCB board is provided with a light receiving component 1, the first optical fiber interface 11 and the second optical fiber
  • the interface 12 is respectively connected to the input end of the light receiving component 1 through an optical fiber, and the CATV light and PON light transmitted in the external fiber can enter the light receiving component 1 through the first fiber interface 11;
  • the light receiving component 1 includes a filter 14 and a light receiving device 15.
  • the light receiving device 15 After the CATV light transmitted by the external optical fiber enters the light receiving component 1 through the first optical fiber interface 11, it is received by the light receiving device 15 through the filter 14, and the light receiving device 15 converts the CATV light into a CATV electrical signal for the television Access to the CATV network; after the PON light transmitted by the external optical fiber enters the light receiving component 1 through the first optical fiber interface 11, it is reflected by the filter 14 to the second optical fiber interface 12, so that the PON light cannot be received by the television.
  • the light receiving component 1 further includes a glass capillary 13, the glass capillary 13 is located between the first optical fiber interface 11 and the filter 14, the optical fiber connecting the first optical fiber interface 11 and the optical receiving component 1, and connecting the first Both the optical fiber interface 12 and the optical fiber of the light receiving component 1 are fixed to the glass capillary 13, which improves the connection stability of the first optical fiber interface 11, the second optical fiber interface 12 and the light receiving component 1.
  • a power amplifier is provided between the light receiving component 1 and the video output terminal 5, the output end of the light receiving device 15 is connected to the input end of the power amplifier, and the output end of the power amplifier is connected to the video output terminal.
  • the power amplifier is used to amplify the CATV electrical signal output by the light receiving device 15 and transmit the amplified CATV electrical signal to the television through the video output terminal.
  • the power amplifier may include a first power amplifier 2 and a second power amplifier 4, the input end of the first power amplifier 2 is connected to the output end of the optical receiving device 15, and the output of the first power amplifier 2 The terminal is connected to the input terminal of the second power amplifier 4.
  • This application sets up a two-stage power amplifier, which is used to amplify the converted CATV electrical signal and drive the subsequent load with a higher-power CATV electrical signal.
  • the CATV electrical signal is amplified by the first power amplifier 2 and the second power amplifier 4, so that the TV set receives the CATV electrical signal with higher power, and the definition of the video program is ensured.
  • An automatic gain controller 3 may also be provided between the first power amplifier 2 and the second power amplifier 4, the input terminal of the automatic gain controller 3 is connected to the output terminal of the first power amplifier 2, and the output terminal of the automatic gain controller 3 It is connected to the input of the second power amplifier 4.
  • Automatic Gain Control (Automatic Gain Control, AGC) refers to an automatic control method that makes the gain of the amplifier circuit automatically adjust with the signal strength.
  • AGC is a kind of limited output, which uses an effective combination of linear amplification and compression amplification to adjust the output signal.
  • the linear amplifier circuit works to ensure the strength of the output signal; when the input signal reaches a certain strength, the compression amplifier circuit is started to reduce the output strength, which can automatically control the amplitude of the gain by changing the input and output compression ratio.
  • the electric signal amplified by the first power amplifier 2 can be adjusted by the automatic gain controller 3 to reduce the signal impurities entering the second power amplifier 4, so that the TV receives the CATV power with greater power and less impurities Signal to ensure the clarity of the video program.
  • the first optical fiber interface 11 is connected to the external optical port 7 of the optical network unit, the external optical fiber is inserted into the external optical port 7, and the CATV light transmitted by the external optical fiber enters the light through the first optical fiber interface 11
  • the CATV light at 1550 nm is received by the light receiving device 15 through the filter 14 in the light receiving module 1, and the light receiving device 15 converts the CATV optical signal into a CATV electrical signal.
  • the CATV electrical signal is then transmitted to the first power amplifier 2, the automatic gain controller 5, and the second power amplifier 4 in order to amplify the CATV electrical signal, and the amplified CATV electrical signal is output to the television so that the television can receive the CATV Video playback using electrical signals.
  • the 1490nm downstream PON light transmitted by the external optical fiber enters the light receiving component 1 through the first optical fiber interface 11, and the PON light is reflected by the filter 14 to the second optical fiber interface 12, so that the PON light cannot be received by the television. Therefore, the CATV light and the PON light in the external optical fiber are separated, so that the TV set only receives the CATV optical signal and is not affected by the PON light.
  • the CATV optical module provided in this application can be flexibly inserted into the optical network unit.
  • the first optical fiber interface 11 is connected to the external optical port 7 of the optical network unit, and the external optical fiber is transmitted
  • the CATV light enters the light receiving component 1 through the first optical fiber interface 11 to provide a CATV electrical signal for the TV, while the PON light transmitted by the external fiber is reflected by the filter 14 and cannot enter the light receiving component 1 to avoid signal interference.
  • users do not need to access CATV, they only need to separate the CATV optical module from the optical network unit. In this way, for an optical network unit with only a PON function, the user can choose whether to connect the CATV optical module as needed, without replacing the optical cat, and the application is flexible and the user experience is improved.
  • an embodiment of the present application further provides an optical network unit.
  • the optical network unit includes a PON optical module 6 and a video receiving optical module.
  • the two optical fiber interfaces 12 are connected to the PON optical module 6 through optical fibers, and the video receiving optical module is the CATV optical module described in the above embodiment.
  • the CATV optical module When the user needs to access the CATV network, the CATV optical module is inserted into the optical network unit.
  • the working process is as follows: the CATV light input from the external optical fiber enters the light receiving component 1 through the first optical fiber interface 11 and is received by the light through the filter 14 The device 15 receives, and the light receiving device 15 converts CATV light into a CATV electrical signal, and outputs the CATV electrical signal to a television; the downstream PON light input from the external optical fiber enters the optical receiving component 1 through the first optical fiber interface 11, which is filtered 14 is reflected to the second optical fiber interface 12, and transmitted to the PON optical module 6 through the second optical fiber interface 12.
  • the PON optical module 6 is used to receive/transmit PON light.
  • the PON optical module 6 includes a PON optical receiving component 61 and a PON optical transmitting component 62.
  • the downstream PON light reflected by the filter 14 enters the PON optical module 6 through the second optical fiber interface 12, It is received by the PON optical receiving component 61 to realize the downlink data reception of the PON, so that other products can receive the PON downlink data and access the PON.
  • the upstream PON light emitted by the PON light transmitting component 62 enters the light receiving component 1 through the second optical fiber interface 12, and is reflected by the filter 14 to the first optical fiber interface 11, so that the upstream PON light enters the external optical fiber, thereby achieving upstream data transmission .
  • the optical network unit provided in the embodiment of the present application may be an optical cat, and the CATV optical module and the optical cat can be disassembled according to the actual needs of users, and the PON function and the CATV function of the optical cat can be switched and applied without replacing the optical cat. Flexible and improve user experience.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Optical Communication System (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

本申请公开了一种视频接收光模块及光网络单元，该光模块包括PCB板、第一光纤接口与第二光纤接口，其中，PCB板上设有光接收组件，第一光纤接口与第二光纤接口分别通过光纤与光接收组件的输入端连接；光接收组件包括滤波片与光接收器件，经由第一光纤接口输入的CATV光透过滤波片被光接收器件接收；经由第一光纤接口输入的下行PON光被滤波片反射至第二光纤接口。本申请提供的视频接收光模块可灵活插入光网络单元中，当需要接入CATV时，只需将该视频接收光模块插入光网络单元中，即可实现光网络单元的CATV功能；当不再需要接入CATV时，只需拆除视频接收光模块即可，无需更换光网络单元，应用灵活，大大提升了用户体验。

Description

一种视频接收光模块及光网络单元
本申请要求在2018年11月28日提交中国专利局、申请号201811433651.4、发明名称为“一种视频接收光模块及光网络单元”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及光通信技术领域，尤其涉及一种视频接收光模块及光网络单元。
背景技术
光调制解调器，即光猫，是针对特殊用户环境而研发的一种光线传输设备，该设备采用大规模集成芯片，电路简单，功耗低，可靠性高，具有完整的告警状态指示和完善的网络管理功能。光猫大多接入PON(Passive Optical Network，无源光网络)，也可根据需要接入CATV(Community Antenna Television，有线电视网)。
常规的接入式CATV应用光猫包括两种模式，一种是插件式的三向光模块插接或焊接在光猫上，三向光模块的核心器件是三向光组件，其通过CWDM(Coarse Wavelength Division Multiplexing，粗波分复用器)将上行数字传输、下行数字传输与模拟CATV三方向的传输复用成一个方向传输，主要完成分波/合波以及模块所需的光电信号转化；另一种是新型BOB(BOSA on Board，光收发模块组件在板技术)方案，即将PON组件与CATV组件直接集成在光猫设备板上。
但是，采用上述两种方案接入CATV时，一旦产品组装成型，该产品即固定具有了CATV功能，使得市场上存在两种光猫，一种为光猫只具有PON功能，另一种为光猫同时具有PON功能与CATV功能，当用户想更换接入CATV时，需要将只具有PON功能的光猫更换为同时具有PON功能与CATV功能的光猫，应用不灵活，造成用户体验下降。
发明内容
本申请提供一种视频接收光模块及光网络单元，以解决接入式CATV应用不灵活，造成用户体验下降的技术问题。
为了解决上述技术问题，本申请实施例公开如下技术方案：
第一方面，本申请实施例公开一种视频接收光模块，包括：PCB板、第一光纤接口与第二光纤接口，其中，
所述PCB板上设有光接收组件，所述第一光纤接口与所述第二光纤接口分别通过光纤与所述光接收组件的输入端连接；
所述光接收组件包括滤波片与光接收器件，经由所述第一光纤接口输入的CATV光透过所述滤波片被所述光接收器件接收；
经由所述第一光纤接口输入的下行PON光被所述滤波片反射至所述第二光纤接口。
可选的，所述光接收器件包括模块电路，用于将所述CATV光转化为CATV电信号。
可选的，所述光接收组件还包括玻璃毛细管，所述玻璃毛细管位于所述第一光纤 接口与所述滤波片之间；
连接所述第一光纤接口与所述光接收组件的光纤、连接所述第二光纤接口与所述光接收组件的光纤均固定于所述玻璃毛细管内。
可选的，还包括视频输出端子，所述视频输出端子的输入端与所述光接收器件的输出端连接。
可选的，所述光接收组件与所述视频输出端子之间设有功率放大器，所述光接收器件的输出端与所述功率放大器的输入端连接，所述功率放大器的输出端与所述视频输出端子连接。
可选的，所述功率放大器包括第一功率放大器与第二功率放大器，所述第一功率放大器的输入端与所述光接收器件的输出端连接，所述第一功率放大器的输出端与所述第二功率放大器的输入端连接，所述第二功率放大器的输出端与所述视频输出端子连接。
可选的，所述第一功率放大器与所述第二功率放大器之间设有自动增益控制器，所述自动增益控制器的输入端与所述第一功率放大器的输出端连接，所述自动增益控制器的输出端与所述第二功率放大器的输入端连接。
第二方面，本申请实施例还公开一种光网络单元，包括视频接收光模块与PON光模块，所述视频接收光模块的第二光纤接口通过光纤与所述PON光模块连接，其中，所述视频接收光模块为第一方面所述的视频接收光模块。
可选的，所述PON光模块发射的上行PON光通过所述第二光纤接口输入所述视频接收光模块，所述上行PON光被滤波片反射至所述视频接收光模块的第一光纤接口。
本申请提供的视频接收光模块可灵活插入光网络单元中，视频接收光模块设置有第一光纤接口与第二光纤接口，第一光纤接口连接外部光纤，接收外部光纤传递的CATV光和PON光，经由第一光纤接口输入的CATV光透过滤波片被光接收器件接收；而经由第一光纤接口输入的PON光被滤波片反射至第二光纤接口，使得外部光纤中的CATV光与PON光能够分离，当需要接入CATV网时，只需将该视频接收光模块插入光网络单元中，即可实现光网络单元的CATV功能；当不再需要接入CATV网时，只需拆除视频接收光模块即可。使用户可根据需要拆装该视频接收光模块，不需要更换光网络单元，应用灵活，能够大大提升用户体验。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本申请。
附图说明
为了更清楚地说明本申请的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，对于本领域普通技术人员而言，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例提供的一种视频接收光模块的结构示意图；
图2为本申请实施例提供的一种视频接收光模块的安装示意图；
图3为本申请实施例提供的另一种视频接收光模块的结构示意图；
图4为本申请实施例提供的一种光网络单元的光路传输示意图。
具体实施方式
为了使本技术领域的人员更好地理解本申请中的技术方案，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本申请保护的范围。
家用光网络单元大多是PON形式(Passive Optical Network，无源光网络)，即光网络单元中集成有PON光模块，通过PON光模块实现光网络单元的PON功能。如果用户需要接入CATV(Community Antenna Television，有线电视网)，则在光网络单元中同时集成CATV光模块与PON光模块，通过CATV光模块实现光网络单元的CATV功能。但是，一旦光网络单元集成CATV光模块，就固定具有CATV功能，因此市场上根据存在两种光网络单元，一种只具有PON功能，另一种同时具有PON功能与CATV功能，当用户需要更换接入CATV时，只能将只具有PON功能的光网络单元更换为同时具有PON功能与CATV功能的光网络单元，应用不灵活，影响用户体验评价。
为了解决上述问题，本申请实施例提供一种视频接收光模块，该光模块可灵活插入光网络单元内，当用户需要接入CATV时，只要将该视频接收光模块插入光网络单元，即可使光网络单元具有CATV功能；当用户不再需要接入CATV时，只要将光模块与光网络单元分离即可，应用非常灵活，不需更换光网络单元，提升用户体验。
本申请实施例提供的视频接收光模块具体为CATV光模块，根据实际需求将该CATV光模块与光网络单元进行拆装，不需更换光网络单元，即可实现光网络单元的CATV功能与PON功能。
参见图1，为本申请实施例提供的一种视频接收光模块的结构示意图。
如图1所示，本申请实施例提供的视频接收光模块，即CATV光模块，包括PCB板、第一光纤接口11与第二光纤接口12，其中，
PCB板上设有光接收组件1，第一光纤接口11与第二光纤接口12分别通过光纤与光接收组件1的输入端连接。如图2所示，使用该CATV光模块时，将第一光纤接口11连接至光网络单元的外部光口7。传输光信号的外部光纤也连接至外部光口7，因此外部光纤传输的光通过外部光口7、第一光纤接口11进入光接收组件1。
光接收组件1包括滤波片14与光接收器件15，滤波片14位于第一光纤接口11与光接收器件15之间的光传播路径上。光接收器件15用于将CATV光信号转化为CATV电信号，以供电视机接收CATV电信号，实现CATV功能。其中，滤波片14通过其表面涂镀的多层反射、透射膜结构，能够透射CATV光、反射PON光。例如，CATV光为波长1550nm的光，PON光为波长1490nm的光，则滤波片14表面应镀有对波长1550nm光透射的膜；还镀有对波长1490nm光反射的膜。
经由过第一光纤接口11输入的CATV光进入光接收组件1后，CATV光透过滤波片14被光接收器件15接收。光接收器件15内置模块电路，以将CATV光信号转化为CATV电信号。最后光接收器件15的输出端将CATV电信号传输给电视机，使电视机接收CATV电信号，播放其对应的视频节目。
如图3所示，本申请实施例提供的CATV光模块还包括视频输出端子5，视频输出端子 5的输入端与光接收器件15的输出端连接，用于将转换生成的CATV电信号输出至电视机中，使得电视机接入CATV电信号。
经由第一光纤接口11输入的下行PON光进入光接收组件1后，PON光被滤波片14反射至第二光纤接口12，无法被光接收器件15接收，从而该CATV光模块只用于处理CATV光。可选的，下行PON光为1490nm的光。
在具体实施过程中，如果外部光纤只传输CATV光信号，则光接收组件1内可不设置滤波片14，外部光纤传输的CATV光直接通过第一光纤接口11进入光接收器件15，并通过光接收器件15将CATV光转化为CATV电信号，以将CATV电信号传输给电视机。如果外部光纤同时传输CATV光与PON光，则需要在光接收组件1内设置滤波片14，通过滤波片14防止PON光进入光接收器件15，避免PON光干扰CATV光信号的传播，提高视频播放质量。
由以上技术方案可知，本申请实施例提供的CATV光模块包括PCB板、第一光纤接口11与第二光纤接口12，PCB板上设有光接收组件1，第一光纤接口11与第二光纤接口12分别通过光纤与光接收组件1的输入端连接，外部光纤中传输的CATV光与PON光可通过第一光纤接口11进入光接收组件1；光接收组件1包括滤波片14与光接收器件15，外部光纤传输的CATV光通过第一光纤接口11进入光接收组件1后，透过滤波片14被光接收器件15接收，光接收器件15将CATV光转化为CATV电信号，以供电视机接入CATV网；外部光纤传输的PON光通过第一光纤接口11进入光接收组件1后，被滤波片14反射至第二光纤接口12，使得PON光无法被电视机接收。
本申请的部分实施例中，光接收组件1还包括玻璃毛细管13，玻璃毛细管13位于第一光纤接口11与滤波片14之间，连接第一光纤接口11与光接收组件1的光纤、连接第二光纤接口12与光接收组件1的光纤均固定于玻璃毛细管13，提高第一光纤接口11、第二光纤接口12与光接收组件1的连接稳固性。
本申请的部分实施例中，光接收组件1与视频输出端子5之间设有功率放大器，光接收器件15的输出端与功率放大器的输入端连接，功率放大器的输出端与视频输出端子连接。功率放大器用于对光接收器件15输出的CATV电信号进行放大，并将放大后的CATV电信号通过视频输出端子传输至电视机上。
在一种可行的实施例中，功率放大器可包括第一功率放大器2与第二功率放大器4，第一功率放大器2的输入端与光接收器件15的输出端连接，第一功率放大器2的输出端与第二功率放大器4的输入端连接。本申请设置两级功率放大器，用于将转化后的CATV电信号进行放大，以较大功率的CATV电信号驱动后续负载。通过第一功率放大器2与第二功率放大器4对CATV电信号进行放大，使得电视机接收到功率较大的CATV电信号，保证视频节目的清晰度。
第一功率放大器2与第二功率放大器4之间还可设有自动增益控制器3，自动增益控制器3的输入端与第一功率放大器2的输出端连接，自动增益控制器3的输出端与第二功率放大器4的输入端连接。自动增益控制(Automatic Gain Control，AGC)是指使放大电路的增益自动地随信号强度而调整的自动控制方法。AGC是限幅输出的一种，它利用线性放大和压缩放大的有效组合对输出信号进行调整。当弱信号输入时，线性放大电路工作，保证输出信号的强度；当输入信号达到一定强度时，启动压缩放大电路，使输出强度降低， 其可以通过改变输入输出压缩比例自动控制增益的幅度。本实施例可以通过自动增益控制器3对第一功率放大器2放大后的电信号进行调整，降低进入第二功率放大器4的信号杂质，使得电视机接收到功率较大且杂质较少的CATV电信号，保证视频节目的清晰度。
本申请提供的CATV光模块在使用时，将第一光纤接口11连接至光网络单元的对外光口7，外部光纤插入对外光口7，外部光纤传输的CATV光通过第一光纤接口11进入光接收组件1，1550nm的CATV光透过光接收组件1中的滤波片14被光接收器件15接收，光接收器件15将CATV光信号转化为CATV电信号。CATV电信号再依次传输至第一功率放大器2、自动增益控制器5、第二功率放大器4，将CATV电信号进行放大，放大后的CATV电信号输出至电视机，使电视机根据接收的CATV电信号进行视频播放。
而外部光纤传输的1490nm下行PON光通过第一光纤接口11进入光接收组件1，PON光被滤波片14反射至第二光纤接口12，使得PON光无法被电视机接收。从而将外部光纤中的CATV光与PON光分离，使得电视机只接收CATV光信号，不会受到PON光的影响。
由以上技术方案可知，本申请提供的CATV光模块可灵活插入光网络单元中，当用户需要接入CATV时，将第一光纤接口11连接至光网络单元的外部光口7上，外部光纤传输的CATV光通过第一光纤接口11进入光接收组件1，为电视机提供CATV电信号，而外部光纤传输的PON光被滤波片14反射，无法进入光接收组件1，避免产生信号干扰。当用户不需要接入CATV时，只需将该CATV光模块与光网络单元分离即可。如此，针对只具有PON功能的光网络单元，用户可根据需要选择是否连接该CATV光模块，不需要更换光猫，应用灵活，提升用户体验。
基于上述实施例所述的CATV光模块，本申请实施例还提供一种光网络单元，如图4所示，该光网络单元包括PON光模块6与视频接收光模块，视频接收光模块的第二光纤接口12通过光纤与PON光模块6连接，所述视频接收光模块为上述实施例所述的CATV光模块。
当用户需要接入CATV网时，将CATV光模块插入光网络单元，其工作过程为：外部光纤输入的CATV光通过第一光纤接口11进入光接收组件1，其透过滤波片14被光接收器件15接收，光接收器件15将CATV光转换为CATV电信号，并将CATV电信号输出至电视机；外部光纤输入的下行PON光通过第一光纤接口11进入光接收组件1，其被滤波片14反射至第二光纤接口12，通过第二光纤接口12传输至PON光模块6。
PON光模块6用于接收/发射PON光，PON光模块6包括PON光接收组件61与PON光发射组件62，被滤波片14反射的下行PON光通过第二光纤接口12进入PON光模块6，被PON光接收组件61接收，实现对PON的下行数据接收，以便于其他产品可接收PON下行数据，接入PON。
同理，PON光发射组件62发射的上行PON光通过第二光纤接口12进入光接收组件1，被滤波片14反射至第一光纤接口11，使得上行PON光进入外部光纤，实现了上行数据传输。
本申请实施例提供的光网络单元可为光猫，可根据用户的实际需求将CATV光模块与光猫进行拆卸，无需更换光猫，即可实现光猫的PON功能与CATV功能的切换，应用灵活，提升用户体验。
需要说明的是，在本说明书中，术语“包括”、“包含”或者其任何其他变体意在涵盖 非排他性的包含，从而使得包括一系列要素的电路结构、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种电路结构、物品或者设备所固有的要素。在没有更多限制的情况下，有语句“包括一个……”限定的要素，并不排除在包括所述要素的电路结构、物品或者设备中还存在另外的相同要素。
本领域技术人员在考虑说明书及实践这里发明的公开后，将容易想到本申请的其他实施方案。本申请旨在涵盖本发明的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本申请的一般性原理并包括本申请未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本申请的真正范围和精神由权利要求的内容指出。
以上所述的本申请实施方式并不构成对本申请保护范围的限定。

Claims (9)

  1. 一种视频接收光模块，其特征在于，包括：PCB板、第一光纤接口与第二光纤接口，其中，
    所述PCB板上设有光接收组件，所述第一光纤接口与所述第二光纤接口分别通过光纤与所述光接收组件的输入端连接；
    所述光接收组件包括滤波片与光接收器件，经由所述第一光纤接口输入的CATV光透过所述滤波片被所述光接收器件接收；
    经由所述第一光纤接口输入的下行PON光被所述滤波片反射至所述第二光纤接口。
  2. 根据权利要求1所述的视频接收光模块，其特征在于，所述光接收器件包括模块电路，用于将所述CATV光转化为CATV电信号。
  3. 根据权利要求1所述的视频接收光模块，其特征在于，所述光接收组件还包括玻璃毛细管，所述玻璃毛细管位于所述第一光纤接口与所述滤波片之间；
    连接所述第一光纤接口与所述光接收组件的光纤、连接所述第二光纤接口与所述光接收组件的光纤均固定于所述玻璃毛细管内。
  4. 根据权利要求1所述的视频接收光模块，其特征在于，还包括视频输出端子，所述视频输出端子的输入端与所述光接收器件的输出端连接。
  5. 根据权利要求4所述的视频接收光模块，其特征在于，所述光接收组件与所述视频输出端子之间设有功率放大器，所述光接收器件的输出端与所述功率放大器的输入端连接，所述功率放大器的输出端与所述视频输出端子连接。
  6. 根据权利要求5所述的视频接收光模块，其特征在于，所述功率放大器包括第一功率放大器与第二功率放大器，所述第一功率放大器的输入端与所述光接收器件的输出端连接，所述第一功率放大器的输出端与所述第二功率放大器的输入端连接，所述第二功率放大器的输出端与所述视频输出端子连接。
  7. 根据权利要求6所述的视频接收光模块，其特征在于，所述第一功率放大器与所述第二功率放大器之间设有自动增益控制器，所述自动增益控制器的输入端与所述第一功率放大器的输出端连接，所述自动增益控制器的输出端与所述第二功率放大器的输入端连接。
  8. 一种光网络单元，其特征在于，包括视频接收光模块与PON光模块，所述视频接收光模块的第二光纤接口通过光纤与所述PON光模块连接，其中，所述视频接收光模块为权利要求1-7任一项所述的视频接收光模块。
  9. 根据权利要求8所述的光网络单元，其特征在于，所述PON光模块发射的上行 PON光通过所述第二光纤接口输入所述视频接收光模块，所述上行PON光被滤波片反射至所述视频接收光模块的第一光纤接口。
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