WO2014180253A1 - 一种支持两种无源光网络共存的光组件及方法 - Google Patents

一种支持两种无源光网络共存的光组件及方法 Download PDF

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Publication number
WO2014180253A1
WO2014180253A1 PCT/CN2014/075976 CN2014075976W WO2014180253A1 WO 2014180253 A1 WO2014180253 A1 WO 2014180253A1 CN 2014075976 W CN2014075976 W CN 2014075976W WO 2014180253 A1 WO2014180253 A1 WO 2014180253A1
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optical
optical signal
passive optical
bandwidth
network
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PCT/CN2014/075976
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English (en)
French (fr)
Inventor
李锟
付志明
匡国华
陈雷
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中兴通讯股份有限公司
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Publication of WO2014180253A1 publication Critical patent/WO2014180253A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0064—Arbitration, scheduling or medium access control aspects

Definitions

  • the present invention relates to passive optical network optical line termination technology, and more particularly to an optical component and method for supporting coexistence of two passive optical network OLTs.
  • OLT Optical Line Terminal
  • 2.5G uplink rate of 2.488 Gbps
  • 10G downlink rate of 9.95 Gbps
  • GPON Global System for Mobile Communications
  • XGPON1 applications need to be compatible with traditional GPON technology, enabling ONUs (Optical Network Units) to choose solutions based on specific application environments.
  • the present invention provides an optical component and method for supporting coexistence of two passive optical networks to solve the technical problem of smooth upgrade from a low bandwidth passive optical network to a high bandwidth passive optical network.
  • an optical component that supports the coexistence of two passive optical networks, including:
  • High-bandwidth passive optical network laser transmitter low-bandwidth passive optical network laser transmitter, high A detection receiver for a bandwidth passive optical network, a detection receiver for a low-bandwidth passive optical network, and a filter for realizing a split-light function on an optical path, where:
  • the laser transmitter of the high bandwidth passive optical network is configured to: transmit a downlink optical signal of a high bandwidth passive optical network
  • the laser transmitter of the low bandwidth passive optical network is configured to: transmit a downlink optical signal of a low bandwidth passive optical network
  • the filter is configured to: a laser transmitter of the high bandwidth passive optical network, a downlink optical signal of the transmitted high bandwidth passive optical network, and the low bandwidth passive light in an optical signal transmission direction
  • the laser transmitter of the network combines the downlink optical signals of the low-bandwidth passive optical network to synthesize one optical signal, and separates the downlink optical signal into the downlink optical signal of the high-bandwidth passive optical network and the low bandwidth in the direction of receiving the optical signal.
  • Downstream optical signal of the source optical network
  • the detection receiver of the high-bandwidth passive optical network is configured to: receive, by the filter, a downlink optical signal of a high-bandwidth passive optical network in a downlink optical signal;
  • the detection receiver of the low-bandwidth passive optical network is configured to: receive, by the filter, a downlink optical signal of a low-bandwidth passive optical network in the downlink optical signal.
  • the optical component comprises a plurality of filters, wherein each filter is respectively configured to: separate and synthesize optical signals of different wavelengths in the high-low bandwidth passive optical network.
  • each filter is further configured to: in the optical signal receiving direction, the downlink optical signals sequentially pass through different filters, and then sequentially separate optical signals of different wavelengths.
  • each filter is further configured to: when the downlink optical signal passes through the primary filter in the direction of receiving the optical signal, separate two sets of optical signals, and each set of optical signals respectively passes through the corresponding secondary When the filter is used, the optical signal of the corresponding wavelength is separated.
  • the laser transmitter of the high bandwidth passive optical network uses a 10G EML electroabsorption modulated laser
  • the low bandwidth passive optical network uses a 2.5G DFB laser
  • the detection receiver of the high-bandwidth passive optical network uses a 2.5G APD detector
  • the low-bandwidth passive optical network detection receiver uses a 1.25G APD detector.
  • the invention also discloses a method for supporting coexistence of two passive optical networks, comprising: a downlink optical signal of a wide passive optical network, and simultaneously transmitting a downlink optical signal of a low-bandwidth passive optical network, passing through the optical component
  • the filter combines a downlink optical signal for transmission;
  • the optical component supporting the two passive optical networks When receiving the downlink optical signal, the optical component supporting the two passive optical networks separates one downlink optical signal into a downlink optical signal of the high-bandwidth passive optical network and the downlink optical of the low-bandwidth passive optical network by using the filter. The signal is then received separately.
  • the optical component includes a plurality of filters, and different optical signals of different wavelengths in the high-low bandwidth passive optical network are separated and synthesized through different filters.
  • the downlink optical signal sequentially passes through different filters, and the optical signals of different wavelengths are sequentially separated.
  • the downlink optical signal passes through the primary filter to separate two sets of optical signals, and each set of optical signals respectively passes through corresponding secondary filters to separate the corresponding wavelengths.
  • Optical signal in the foregoing method, in the optical signal receiving direction, the downlink optical signal passes through the primary filter to separate two sets of optical signals, and each set of optical signals respectively passes through corresponding secondary filters to separate the corresponding wavelengths.
  • the downlink optical signal of the high-bandwidth passive optical network is transmitted by the 10G EML electroabsorption modulation laser, and the low-bandwidth passive is transmitted by the 2.5G DFB laser.
  • the downlink optical signal of the optical network, the downlink optical signal of the high-bandwidth passive optical network is received by the 2.5G APD detector, and the downstream optical signal of the low-bandwidth passive optical network is received by the 1.25G APD detector.
  • the technical solution of the present application realizes the coexistence of two passive optical network optical components, and supports the traditional low-bandwidth OLT optical component technical solution and the optical component technical solution of the high-rate passive optical network.
  • the system can be smoothly upgraded, which effectively reduces the system upgrade cost and operation and maintenance cost of the operator.
  • FIG. 1 is a schematic structural diagram of a system according to an application scenario of an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a system according to an optimized embodiment of the present invention.
  • FIG. 3 is a schematic block diagram of an optical component in an optimized embodiment of the present invention
  • 4 is a schematic diagram of an internal splitting and splitting scheme 1 of an optical device in an optimized embodiment of the present invention
  • FIG. 5 is a schematic diagram of an internal splitting and splitting scheme 2 of an optical device in an optimized embodiment of the present invention
  • FIG. 6 is an optimized embodiment of the present invention. Functional block diagram of one;
  • FIG. 7 is a functional block diagram of the filters 1, 2, 3, 4, and 5 in the first embodiment of the present invention
  • FIG. 8 is a functional block diagram of the second embodiment of the present invention
  • FIG. 9 is a functional characteristic definition of the filters 1, 2, 3, 4, and 5 in the second embodiment of the present invention.
  • the double-headed arrows in the above figures indicate that light of a corresponding wavelength can be transmitted in the forward and reverse directions of the optical path, and does not represent the actual direction of transmission of the light.
  • Preferred embodiment of the invention
  • the inventor of the present application proposes a coexistence type that can work in the case of two passive optical networks.
  • the optical component of the OLT includes two downlink optical signal transmitting sections (a laser transmitting portion of a high bandwidth passive optical network and a low bandwidth passive optical network) and two uplink burst mode optical signal receiving portions (high bandwidth passive light)
  • Network and low-bandwidth passive optical network detector receiving part can work in both high-bandwidth passive optical network systems and low-bandwidth passive optical network systems, thus solving low-bandwidth passive optical networks
  • the technical problem of smooth upgrade to high-bandwidth passive optical networks can work in both high-bandwidth passive optical network systems and low-bandwidth passive optical network systems.
  • the optical combination provided by the embodiment includes at least a laser transmitter of a high bandwidth passive optical network, a laser transmitter of a low bandwidth passive optical network, a detection receiver of a high bandwidth passive optical network, and a low bandwidth passive.
  • Optical network detection receiver and filter wherein:
  • a laser transmitter of a high-bandwidth passive optical network that transmits a downlink optical signal of a high-bandwidth passive optical network
  • a low-bandwidth passive optical network laser transmitter that transmits a downlink optical signal of a low-bandwidth passive optical network; a filter, a laser transmitter of the high bandwidth passive optical network, a downlink optical signal of the high bandwidth passive optical network, and a laser transmitter of the low bandwidth passive optical network in an optical signal transmission direction
  • the downlink optical signal of the transmitted low-bandwidth passive optical network is combined into one optical signal, and the downlink optical signal is separated into the downlink optical signal of the high-bandwidth passive optical network and the downlink of the low-bandwidth passive optical network in the direction of receiving the optical signal.
  • the detection receiver of the high-bandwidth passive optical network receives the downlink optical signal of the high-bandwidth passive optical network in the downlink optical signal;
  • the detection receiver of the low-bandwidth passive optical network receives the downlink optical signal of the high-bandwidth passive optical network in the downlink optical signal.
  • the laser transmitter of the high-bandwidth passive optical network converts the electrical signal of the high-bandwidth passive optical network into an optical signal for transmission.
  • Laser transmitter for low-bandwidth passive optical networks The electrical signals of low-bandwidth passive optical networks are converted into optical signals for transmission.
  • the detection receiver of the high-bandwidth passive optical network converts the received optical signal of the high-bandwidth passive optical network into a current signal through a photodiode and sends it to a corresponding burst mode transimpedance amplifier, which is converted into a differential voltage signal and sent To the corresponding burst limiting amplifier.
  • the low-bandwidth passive optical network detection receiver converts the received low-bandwidth passive optical network optical signal into a current signal through a photodiode and sends it to a corresponding burst mode transimpedance amplifier, which is converted into a differential voltage signal and sent To the corresponding burst limiting amplifier.
  • the filter includes: a filter that realizes a split-wave function in the optical path to prevent optical crosstalk.
  • a filter that realizes a split-wave function in the optical path to prevent optical crosstalk.
  • the optical components of the OLT supporting the coexistence of GPON and XGPON1 include optical interface, 10G EML electroabsorption modulated laser transmitting part, 2.5G DFB laser emitting part, 2.5G APD detector receiving part.
  • the 1.25G APD detector receives part and the filter part that realizes the splitting function on the optical path.
  • the 10G EML electroabsorption modulated laser emitting portion comprises: 10G 1577nm EML laser
  • the device converts the 10G XGPON1 electrical signal into an optical signal for transmission, and its built-in TEC ensures that the operating temperature of the laser is constant.
  • the 2.5G DFB transmission section includes: a 2.5G 1490 nm DFB laser converts the GPON signal to optical signal transmission.
  • the receiving portion of the 2.5G APD detector includes: converting the received optical signal into a current signal through an avalanche photodiode and sending it to a 2.5G burst mode transimpedance amplifier, converting it into a differential voltage signal and sending it to a 2.5G burst limit. Amplifier.
  • the receiving portion of the 1.25G APD detector includes: converting the received optical signal into a current signal through an avalanche photodiode and sending it to a 1.25G burst mode transimpedance amplifier, converting it into a differential voltage signal and sending it to a 1.25G burst limit. Amplifier.
  • FIG. 1 it is a block diagram of the system structure in the preferred embodiment.
  • This example designs an optical component that supports OLT coexistence of two passive optical networks.
  • the coexistence system supports the use of a low-bandwidth passive optical network ONU and a high-bandwidth passive optical network ONU.
  • the coexisting optical component involved in this example can work in two modes, one is a high bandwidth OLT mode, and the uplink and downlink wavelengths are simply referred to as a first uplink and a first downlink wavelength; the other is a low bandwidth OLT mode.
  • the uplink and downlink wavelengths are simply referred to as the second uplink and the second downlink wavelength.
  • FIG. 2 it is a block diagram of the system structure in which the specific examples of GPON and XGPON1 coexist.
  • the coexisting optical components in the example can work in two modes, one is GPON OLT mode, the uplink rate is 1.25Gbps, the burst reception with 1310nm center wavelength, the downlink rate is 2.5Gbps, and the transmission of 1490nm center wavelength continuous mode is adopted.
  • the other is the XGPON1 OLT mode, with an uplink rate of 2.5 Gbps, burst reception with a center wavelength of 1270 nm, a downlink rate of 10 Gbps, and a transmission portion of the 1577 nm ZTE wavelength continuous mode.
  • FIG. 3 it is a schematic block diagram of an optical component that supports the coexistence of two passive optical network systems, including an optical interface, a first downlink transmitting portion, a second downlink transmitting portion, and a first uplink receiving portion.
  • the second uplink receiving portion and the filter portion that implements the splitting function on the optical path.
  • FIG. 4 it is a schematic diagram of the optical component implementing the different wavelength multiplexing and demultiplexing function scheme 1 in this example. It includes an optical interface, filters 1 and 2, 3 that realize the splitting function on the optical path, and optical devices operating in different wavelength bands.
  • the basic principle is to separate the wavelength 1 from the wavelengths 2, 3, and 4 through the filter 1.
  • the filter 2 separates the wavelength 2 from the wavelengths 3 and 4, and the filter 3 separates the wavelength 3 and the wavelength 4, thereby realizing the inside of the optical device.
  • Combined wave function In the specific implementation process, the position of the optical components and the order of the combined and divided waves can be reasonably arranged according to actual conditions.
  • FIG. 6 it is a functional block diagram of a preferred example 1 of the present invention.
  • the multiplexer of the optical path is implemented by the scheme one shown in Fig. 4. Including optical interface, 10G transmitting part, 2.5G transmitting part, 2.5G receiving part, 1.25G receiving part and filter part.
  • the optical interface uses the SC Receptacle mode.
  • the 10G transmitting portion includes: a 10G 1577nm laser and a built-in TEC controller portion.
  • the 10G laser uses an EML laser to convert an electrical signal into an optical signal.
  • the built-in TEC controller controls the temperature of the EML laser to keep the laser output wavelength stable and meets system requirements.
  • the 2.5G transmitting portion includes: a 2.5G DFB laser. In the example of the present invention, 2.5G is used.
  • a 1490nm DFB laser converts a 2.5G electrical signal into an optical signal.
  • the 2.5G receiving portion includes: a 2.5G APD (Avalanche Photodiode) detector.
  • the APD detector converts the received 2.5G optical signal into a current signal.
  • the 1.25G receiving portion includes: a 1.25G APD (Avalanche Photodiode) detector.
  • the APD detector converts the received 1.25G optical signal into a current signal.
  • the filter portion includes filters 1, 2, 3, 4, 5.
  • the filters 1, 2, and 3 are 45.
  • the filter 1 combines the received light signal of 1270 nm with the received light signal of 1310 nm and the emitted light signal of 1490 nm and 1577 nm to ensure that the received light signal and other optical signals of 1270 nm are transmitted along their respective optical paths; the filter 2 will be 1310 nm.
  • the received optical signal is combined with the 1490nm and 1577nm emitted optical signals to ensure that the 1310nm received optical signal and the 1490nm and 1577nm transmitted optical signals are transmitted along their respective optical paths.
  • the filter 3 combines the optical signals of 1490nm and 1577nm to ensure 1490nm.
  • the filters 4, 5 are 0. Filter 4; Filter 4 will filter the optical signal outside the 1270nm receive signal band to prevent crosstalk from other optical signals received by XGPON1; Filter 5 will filter out the 1310nm receive signal band The optical signal prevents crosstalk from other optical signals to the GPON reception.
  • FIG. 7 is a functional characteristic diagram of the filters 1 , 2, 3, 4, and 5 in the specific example 1. Specifically, the transmission band and the reflection band of the filters 1, 2, 3, 4, and 5 are as shown in Table 1.
  • Table 1 is the transmission and reflection band table of each filter in the specific example 1.
  • the filter 1 is totally reflected for the 1270 received optical signal, for 1310 nm,
  • FIG. 5 it is a schematic diagram of the second embodiment of the optical component in the present invention. It includes an optical interface, filters 1 and 2, 3 that realize the splitting function on the optical path, and optical devices operating in different wavelength bands.
  • the basic principle is to separate the wavelengths 1 and 4 and the wavelengths 2 and 3 through the filter 1 (ie, the primary filter), and then the filters 2 and 3 (ie, the secondary filters) are respectively paired to the wavelengths 1, 4 and wavelengths. 2, 3 to separate, so as to achieve the split-wave function inside the optical device.
  • the position of the optical components and the order of the combined and divided waves can be reasonably arranged according to the actual situation.
  • FIG. 8 it is a functional block diagram of a preferred example 2 of the present invention.
  • the multiplexer of the optical path is implemented by the second scheme shown in Figure 5. Including optical interface, 10G transmitting part, 2.5G transmitting part, 2.5G receiving part, 1.25G receiving part and filter part.
  • the optical interface uses an SC Receptacle mode.
  • the 10G transmitting portion includes: a 10G 1577nm laser and a built-in TEC controller portion.
  • the 10G laser uses an EML laser to convert an electrical signal into an optical signal.
  • the built-in TEC controller controls the temperature of the EML laser to keep the laser output wavelength stable and meets system requirements.
  • the 2.5G transmitting portion includes: a 2.5G DFB laser. In the example of the present invention, 2.5G is used.
  • a 1490nm DFB laser converts a 2.5G electrical signal into an optical signal.
  • the 2.5G receiving portion includes: a 2.5G APD (Avalanche Photodiode) detector.
  • the APD detector converts the received 2.5G optical signal into a current signal.
  • the 1.25G receiving portion includes: a 1.25G APD (Avalanche Photodiode) detector.
  • the APD detector converts the received 1.25G optical signal into a current signal.
  • the filter portion includes filters 1, 2, 3, 4, 5.
  • the filters 1, 2, and 3 are 45.
  • the filter 1 combines a 1270 nm received optical signal, a 1577 nm transmitted optical signal, a 1310 nm received optical signal, and a 1490 nm transmitted optical signal to ensure a 1270 nm received optical signal, a 1577 nm transmitted optical signal, a 1310 nm received optical signal, and a 1490 nm emitted light.
  • the signal is transmitted along the respective optical paths; the filter 2 combines the 1270 nm received optical signal and the 1577 nm transmitted optical signal to ensure that the 1270 nm and 1577 nm optical signals do not generate crosstalk; the filter 3 combines the 1310 nm received optical signal and the I490 nm transmitted optical signal. The wave ensures that the 1310nm and 1490nm optical signals do not generate crosstalk.
  • Filter 4 and filter 5 are 0. Filter 4; Filter 4 will filter the optical signal outside the 1270nm receive signal band to prevent crosstalk from other optical signals to XGPON1; Filter 5 will filter the optical signal outside the 1310nm receive signal band to prevent crosstalk from other optical signals to GPON reception. .
  • Figure 9 shows the functional characteristics of the filters 1, 2, 3, 4, and 5 in the specific example 2. Specifically, the transmission band and the reflection band of the filters 1 , 2, 3, 4, and 5 are as shown in Table 2.
  • Table 2 is the transmission and reflection band table of each filter in the specific example 2.
  • the filter 1 is fully transmissive for the 1270 nm received optical signal and the 1577 nm transmitted optical signal, and is totally reflected for the 1310 nm, 1490 nm optical signal; the filter 2 is totally reflected for the 1270 nm optical signal, and is completely transmitted for the 1577 nm optical signal; The film 3 is totally reflected for the 1490 nm optical signal, and the 1310 nm optical signal is all transmitted; the filter 4 is completely transmitted for the 1270 nm optical signal, and the remaining band optical signals are all reflected; the filter 5 is completely transmitted for the 1310 nm optical signal, and the remaining band optical signals are all reflected.
  • This embodiment provides a method for supporting coexistence of two types of passive optical networks, which can be implemented according to the optical component of Embodiment 1 above. Specifically, the method includes:
  • a downlink optical signal of a wide passive optical network simultaneously transmitting a downlink optical signal of a low-bandwidth passive optical network, and synthesizing a downlink optical signal through the filter in the optical component for transmitting;
  • the optical component supporting the two passive optical networks When receiving the downlink optical signal, the optical component supporting the two passive optical networks separates one downlink optical signal into a downlink optical signal of the high-bandwidth passive optical network and the downlink optical of the low-bandwidth passive optical network by using the filter. The signal is then received separately.
  • the optical component includes a plurality of filters, and different optical filters of different wavelengths in the high-low bandwidth passive optical network can be separated and synthesized through different filters.
  • the downlink optical signal may sequentially pass through different filters, and then sequentially separate optical signals of different wavelengths.
  • the downlink optical signal may also be separated by two or more sets of optical signals by using a primary filter, and each set of optical signals respectively passes through corresponding secondary filters to separate optical signals of corresponding wavelengths.
  • the optical component supports the coexistence of GPON and XGPON1, and the downlink optical signal of the high-bandwidth passive optical network is transmitted by the 10G EML electroabsorption modulation laser, and the low-bandwidth passive optical network is transmitted by using the 2.5G DFB laser.
  • the downlink optical signal, the 2.5G APD detector receives the downlink optical signal of the high-bandwidth passive optical network, and the 1.25G APD detector receives the downlink optical signal of the low-bandwidth passive optical network.
  • a program to instruct the associated hardware such as a read only memory, a magnetic disk, or an optical disk.
  • each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module. This application is not limited to any specific combination of hardware and software.
  • the technical solution of the present application designs two OLT optical components in which two passive optical networks coexist.
  • the coexistence of GPON and XGPON1 systems is used as an optimized embodiment, and two specific implementation examples are provided.
  • Program. It supports both traditional GPON optical component technology solutions and XGPONl high-rate optical component technology solutions. It can achieve smooth upgrade of the system, effectively reducing the system upgrade cost and operation and maintenance cost of the operator.

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Abstract

一种支持两种无源光网络共存的光组件及方法，涉及无源光网络光线路终端技术。本发明公开的光组件包括：高带宽无源光网络的激光发射器、低带宽无源光网络的激光发射器、高带宽无源光网络的探测接收器、低带宽无源光网络的探测接收器以及在光路上实现合分光功能的滤波片。本发明实施例还公开了一种支持两种无源光网络共存的方法。本申请技术方案实现了两种无源光网络光组件共存的功能，既支持传统的低带宽OLT光组件技术方案，也支持高速率无源光网络的光组件技术方案。

Description

一种支持两种无源光网络共存的光组件及方法
技术领域
本发明涉及无源光网络光线路终端技术， 具体地说， 涉及一种支持两种 无源光网络 OLT共存的光组件及方法。
背景技术
随着光纤通信技术的快速发展， 光纤接入技术的推广和普及， 人们对带 宽的需求不断增加， 使得目前的无源光网络技术（例如 EPON、 GPON )技 术已逐渐不能满足日益增长的宽带业务的需求。 因此可提供更高带宽的无源 光网络（例如 10G EPON、 XGPON1 )技术成为下一代宽带接入网的解决方 案。 考虑到成本、 维护和系统的平滑升级， 高带宽的无源光网络的应用需要 和低带宽的无源光网络兼容。
以 GPON和 XGPON1技术举例来说， 在 GPON技术中， OLT (光线路 终端）是用于连接光纤干线的主要设备， 其 OLT光模块是实现 GPON光纤 通信的重要组成部分。 相关的 XGPON1 OLT 技术方案可实现上行速率 2.488Gbps (下文简称为 2.5G ) , 下行速率 9.95Gbps (下文简称为 10G ) 的 数据传输。
目前， GPON技术方案成熟稳定， 已大量商业应用。 XGPON1应用需要 兼容传统的 GPON技术， 使 ONU (光网络单元）可以根据具体的应用环境 选择方案。
发明内容
本发明提出一种支持两种无源光网络共存的光组件及方法， 以解决从低 带宽无源光网络到高带宽无源光网络平滑升级的技术问题。
为了解决上述问题， 本发明公开了一种支持两种无源光网络共存的光组 件， 包括：
高带宽无源光网络的激光发射器、 低带宽无源光网络的激光发射器、 高 带宽无源光网络的探测接收器、 低带宽无源光网络的探测接收器以及在光路 上实现合分光功能的滤波片， 其中：
所述高带宽无源光网络的激光发射器， 设置为： 发射一路高带宽无源光 网络的下行光信号；
所述低带宽无源光网络的激光发射器， 设置为： 发射一路低带宽无源光 网络的下行光信号；
所述滤波片， 设置为： 在光信号发射方向上， 将所述高带宽无源光网络 的激光发射器， 发射的高带宽无源光网络的下行光信号， 以及所述低带宽无 源光网络的激光发射器， 发射的低带宽无源光网络的下行光信号合成一路光 信号， 在光信号接收方向上， 将下行光信号分离成高带宽无源光网络的下行 光信号以及低带宽无源光网络的下行光信号；
所述高带宽无源光网络的探测接收器， 设置为： 通过所述滤波片接收下 行光信号中高带宽无源光网络的下行光信号；
所述低带宽无源光网络的探测接收器， 设置为： 通过所述滤波片接收下 行光信号中低带宽无源光网络的下行光信号。
可选地， 上述光组件包括多个滤波片， 其中， 各滤波片分别设置为： 分 离和合成高低带宽无源光网络中不同波长的光信号。
可选地， 上述光组件中， 各滤波片还设置为： 在光信号接收方向上， 下 行光信号依次通过不同的滤波片后， 依次分离出不同波长的光信号。
可选地， 上述光组件中， 各滤波片还设置为： 在光信号接收方向上， 下 行光信号通过一级滤波片时， 分离出两组光信号， 每组光信号分别通过相应 的二级滤波片时， 分离出相应波长的光信号。 可选地， 上述光组件中， 所述光组件支持 GPON和 XGPON1共存时， 所述高带宽无源光网络的激光发射器釆用 10G EML电吸收调制激光器、 所 述低带宽无源光网络的激光发射器釆用 2.5G DFB激光器、 所述高带宽无源 光网络的探测接收器釆用 2.5G APD探测器、 所述低带宽无源光网络的探测 接收器釆用 1.25G APD探测器。 本发明还公开了一种支持两种无源光网络共存的方法， 包括： 宽无源光网络的下行光信号，同时发射一路低带宽无源光网络的下行光信号， 经过所述光组件中的滤波片合成一路下行光信号进行发送；
支持两种无源光网络共存的光组件在接收下行光信号时， 通过所述滤波 片将一路下行光信号分离成高带宽无源光网络的下行光信号以及低带宽无源 光网络的下行光信号， 再分别进行接收。
可选地， 上述方法中， 所述光组件包括多个滤波片， 通过不同的滤波片 分离和合成高低带宽无源光网络中不同波长的光信号。
可选地， 上述方法中， 在光信号接收方向上， 下行光信号依次通过不同 的滤波片， 依次分离出不同波长的光信号。
可选地， 上述方法中， 在光信号接收方向上， 下行光信号通过一级滤波 片， 分离出两组光信号， 每组光信号再分别通过相应的二级滤波片， 分离出 相应波长的光信号。
可选地， 上述方法中， 所述光组件支持 GPON和 XGPON1共存时， 釆 用 10G EML电吸收调制激光器发射高带宽无源光网络的下行光信号、 釆用 2.5G DFB激光器发射低带宽无源光网络的下行光信号、 釆用 2.5G APD探测 器接收高带宽无源光网络的下行光信号、釆用 1.25G APD探测器接收低带宽 无源光网络的下行光信号。
本申请技术方案实现了两种无源光网络光组件共存的功能， 既支持传统 的低带宽 OLT 光组件技术方案， 也支持高速率无源光网络的光组件技术方 案。可以实现系统的平滑升级，有效降低运营商的系统升级成本和运维成本。 附图概述
图 1为本发明实施例应用场景的系统结构示意图；
图 2为本发明优化实施例的系统结构示意图；
图 3为本发明优化实施例中光组件原理框图； 图 4为本发明优化实施例中光器件内部合分波方案一的原理图； 图 5为本发明优化实施例中光器件内部合分波方案二的原理图； 图 6为本发明优化实施例一的功能原理框图；
图 7为本发明优化实施例一中滤波片 1、 2、 3、 4、 5的功能特性定义； 图 8为本发明优化实施例二的功能原理框图；
图 9为本发明优化实施例二中滤波片 1、 2、 3、 4、 5的功能特性定义。 上述附图中的双向箭头表示对应波长的光线可以在该光路的正反向上传 输， 不代表光线的实际传输方向。 本发明的较佳实施方式
下文将结合附图对本发明技术方案作进一步详细说明。 需要说明的是， 在不冲突的情况下， 本申请的实施例和实施例中的特征可以任意相互组合。
实施例 1
本申请发明人提出一种可以工作在两种无源光网络情况下的共存式
OLT的光组件， 其包括两路下行光信号发射部分（高带宽无源光网络和低带 宽无源光网络的激光器发射部分）和两路上行突发模式光信号接收部分（高 带宽无源光网络和低带宽无源光网络的探测器接收部分） ， 既可工作在高带 宽的无源光网络系统也可工作在低带宽的无源光网络系统下， 从而解决从低 带宽无源光网络到高带宽无源光网络平滑升级的技术问题。
具体地， 本实施例提供的用光组合至少包括高带宽无源光网络的激光发 射器、 低带宽无源光网络的激光发射器、 高带宽无源光网络的探测接收器、 低带宽无源光网络的探测接收器以及滤波片， 其中：
高带宽无源光网络的激光发射器， 发射一路高带宽无源光网络的下行光 信号；
低带宽无源光网络的激光发射器， 发射一路低带宽无源光网络的下行光 信号； 滤波片，在光信号发射方向上，将所述高带宽无源光网络的激光发射器， 发射的高带宽无源光网络的下行光信号， 以及所述低带宽无源光网络的激光 发射器， 发射的低带宽无源光网络的下行光信号合成一路光信号， 以光信号 接收方向上， 将下行光信号分离成高带宽无源光网络的下行光信号以及低带 宽无源光网络的下行光信号；
高带宽无源光网络的探测接收器， 接收下行光信号中高带宽无源光网络 的下行光信号；
低带宽无源光网络的探测接收器， 接收下行光信号中高带宽无源光网络 的下行光信号。
其中， 高带宽无源光网络的激光发射器： 将高带宽无源光网络的电信号 转换为光信号进行发送。
低带宽无源光网络的激光发射器： 将低带宽无源光网络的电信号转换为 光信号进行发送。
高带宽无源光网络的探测接收器： 将收到的高带宽无源光网络的光信号 通过光电二极管转化为电流信号并送至相应的突发模式跨阻放大器， 转化为 差分电压信号并送至对应的突发限幅放大器。
低带宽无源光网络的探测接收器： 将收到的低带宽无源光网络的光信号 通过光电二极管转化为电流信号并送至相应的突发模式跨阻放大器， 转化为 差分电压信号并送至对应的突发限幅放大器。
滤波片包括： 在光路中实现合分波功能， 防止光串扰的滤波片。 本实施 例中提出了两种不同的方案实现光器件内部的合分波功能， 不同的方案在具 实施例中将具体描述。
实际应用中，以 GPON和 XGPON1的共存为例，支持 GPON和 XGPON1 共存的 OLT的光组件包括光接口、 10G EML电吸收调制激光器发射部分、 2.5G DFB激光器发射部分、 2.5G APD探测器接收部分、 1.25G APD探测器 接收部分以及在光路上实现合分光功能的滤波片部分。
所述 10G EML电吸收调制激光器发射部分包括： 10G 1577nm EML激光 器将 10G XGPON1电信号转换为光信号进行发送， 其内置的 TEC保证激光 器的工作温度恒定。
所述 2.5G DFB发射部分包括： 2.5G 1490nm DFB激光器将 GPON电信 号转换为光信号发送。
所述 2.5G APD探测器接收部分包括： 将收到的光信号通过雪崩光电二 极管转化为电流信号并送至 2.5G突发模式跨阻放大器，转化为差分电压信号 并送至 2.5G突发限幅放大器。
所述 1.25G APD探测器接收部分包括： 将收到的光信号通过雪崩光电二 极管转化为电流信号并送至 1.25G突发模式跨阻放大器， 转化为差分电压信 号并送至 1.25G突发限幅放大器。
以下结合附图对本发明的优选实例一进行说明。
如图 1所示， 是本优选实例中的系统结构原理框图。 本实例设计一款支 持两种无源光网络的 OLT共存的光组件 ,共存系统中支持使用低带宽无源光 网络 ONU和高带宽无源光网络 ONU。 本实例涉及的共存光组件可工作在 两种模式下，一种是高带宽 OLT模式，其上下行波长简称为第一路上行和第 一路下行波长； 另一种是低带宽 OLT模式， 其上下行波长简称为第二路上 行和第二路下行波长。 如图 2所示， 是具体实例 GPON和 XGPON1共存的 系统结构框图。 一款 GPON OLT和 XGPON1 OLT共存的光组件， 共存系统 中支持使用 GPON ONU和 XGPON1 ONU。 实例中的共存光组件可工作在两 种模式下， 一种是 GPON OLT模式， 上行速率 1.25Gbps, 釆用 1310nm中心 波长的突发接收， 下行速率 2.5Gbps, 釆用 1490nm中心波长连续模式的发射 部分； 另一种是 XGPON1 OLT模式， 上行速率 2.5Gbps, 釆用 1270nm中心 波长的突发接收， 下行速率 lOGbps, 釆用 1577nm中兴波长连续模式的发射 部分。
如图 3所示， 是本实例支持两种无源光网络系统共存的光组件的原理框 图， 包括光接口、 第一路下行发射部分、 第二路下行发射部分、 第一路上行 接收部分、 第二路上行接收部分以及在光路上实现分光功能的滤波片部分。 如图 4所示， 是本实例中光组件实现不同波长合分波功能方案一的原理 图。 包括光接口、 在光路上实现合分波功能的滤波片 1、 2、 3 , 和工作在不 同波长段的光器件。 其基本原理是通过滤波片 1将波长 1与波长 2、 3、 4分 离， 滤波片 2将波长 2和波长 3、 4分离， 滤波片 3将波长 3和波长 4分离， 从而在光器件内部实现合分波功能。 在具体实现过程中， 可以根据实际情况 合理安排各个光器件的位置及合分波的先后次序。
如图 6所示： 是本发明优选实例一的功能原理框图。 光路的合分波釆用 图 4所示的方案一实现。 包括光接口、 10G发射部分、 2.5G发射部分、 2.5G 接收部分、 1.25G接收部分以及滤波片部分。
所述光接口釆用 SC Receptacle模式。
所述 10G发射部分包括： 10G 1577nm激光器和内置的 TEC控制器部分。 本发明实例中 10G激光器釆用 EML激光器， 将电信号转换为光信号。 内置 的 TEC控制器对 EML激光器的温度进行控制， 保持激光器输出波长稳定， 符合系统要求。
所述 2.5G发射部分包括： 2.5G DFB激光器。 本发明实例中釆用 2.5G
1490nm DFB激光器， 将 2.5G电信号转换为光信号。
所述 2.5G接收部分包括： 2.5G APD (雪崩光电二极管）探测器。 本发 明实例中 APD探测器将收到的 2.5G光信号转换为电流信号。
所述 1.25G接收部分包括： 1.25G APD (雪崩光电二极管）探测器。 本 发明实例中 APD探测器将收到的 1.25G光信号转换为电流信号。
所述滤波片部分包括滤波片 1、 2、 3、 4、 5。 本发明实例中滤波片 1、 2、 3为 45 。滤波片； 滤波片 1将 1270nm的接收光信号与 1310nm接收光信号 和 1490nm、 1577nm的发射光信号进行合分波， 保证 1270nm接收光信号和 其他光信号沿各自光路传输； 滤波片 2将 1310nm的接收光信号与 1490nm、 1577nm 的发射光信号进行合分波， 保证 1310nm接收光信号和 1490nm、 1577nm发射光信号沿各自光路传输； 滤波片 3将 1490nm和 1577nm的光信 号进行合分波， 保证 1490nm和 1577nm光信号不产生串扰； 滤波片 4、 5为 0 。滤波片； 滤波片 4将过滤 1270nm接收信号波段以外的光信号， 防止其他 光信号对 XGPON1接收的串扰； 滤波片 5将过滤 1310nm接收信号波段以外 的光信号， 防止其他光信号对 GPON接收的串扰。
图 7所示为具体实例一中滤波片 1 、 2、 3、 4、 5的功能特性图。 具体地, 滤波片 1、 2、 3、 4、 5的透射波段和反射波段如表 1所示。
表 1为具体实例一中各滤波片的透射和反射波段表
Figure imgf000010_0001
从表 1可以看出，滤波片 1对于 1270接收光信号全反射，对于 1310nm、
1490、 1577nm光信号全部透射； 滤波片 2对于 1310接收光信号全反射， 对 于 1490、 1577nm光信号全部透射； 滤波片 3对于 1490nm光信号全部反射， 1577nm光信号全部透射； 滤波片 4对于 1270nm光信号全部透射， 其余波段 光信号全部反射； 滤波片 5对于 1310nm光信号全部透射， 其余波段光信号 全部反射。
以下结合附图 5、 图 8和图 9对优选实例二进行说明。
如图 5所示， 是本发明中光组件实现不同波长合分波功能方案二的原理 图。 包括光接口、 在光路上实现合分波功能的滤波片 1 、 2、 3 , 和工作在不 同波长段的光器件。 其基本原理是通过滤波片 1 (即一级滤波片 )将波长 1 、 4和波长 2、 3进行分离， 然后滤波片 2、 3 (即二级滤波片）再各自对波长 1、 4和波长 2、 3进行分离， 从而在光器件内部实现合分波功能。 在具体实现过 程中， 可以根据实际情况合理安排各个光器件的位置及合分波的先后次序。
如图 8所示： 是本发明优选实例二的功能原理框图。 光路的合分波釆用 图五所示的方案二实现。 包括光接口、 10G发射部分、 2.5G发射部分、 2.5G 接收部分、 1.25G接收部分以及滤波片部分。
所述光接口釆用 SC Receptacle模式。 所述 10G发射部分包括： 10G 1577nm激光器和内置的 TEC控制器部分。 本发明实例中 10G激光器釆用 EML激光器， 将电信号转换为光信号。 内置 的 TEC控制器对 EML激光器的温度进行控制， 保持激光器输出波长稳定， 符合系统要求。
所述 2.5G发射部分包括： 2.5G DFB激光器。 本发明实例中釆用 2.5G
1490nm DFB激光器， 将 2.5G电信号转换为光信号。
所述 2.5G接收部分包括： 2.5G APD (雪崩光电二极管）探测器。 本发 明实例中 APD探测器将收到的 2.5G光信号转换为电流信号。
所述 1.25G接收部分包括： 1.25G APD (雪崩光电二极管）探测器。 本 发明实例中 APD探测器将收到的 1.25G光信号转换为电流信号。
所述滤波片部分包括滤波片 1、 2、 3、 4、 5。 本发明实例中滤波片 1、 2、 3为 45 。滤波片； 滤波片 1将 1270nm接收光信号、 1577nm发射光信号和 1310nm接收光信号、 1490nm发射光信号进行合分波， 保证 1270nm接收光 信号、 1577nm发射光信号和 1310nm接收光信号、 1490nm发射光信号沿各 自光路传输； 滤波片 2将 1270nm接收光信号和 1577nm发射光信号进行合 分波， 保证 1270nm和 1577nm光信号不产生串扰； 滤波片 3将 1310nm接收 光信号和 I490nm发射光信号进行合分波，保证 1310nm和 1490nm光信号不 产生串扰。 滤波片 4和滤波片 5为 0 。滤波片； 滤波片 4将过滤 1270nm接 收信号波段以外的光信号， 防止其他光信号对 XGPON1接收的串扰； 滤波片 5将过滤 1310nm接收信号波段以外的光信号， 防止其他光信号对 GPON接 收的串扰。
如图 9所示为具体实例二中滤波片 1、 2、 3、 4、 5的功能特性图。 具体 地， 滤波片 1 、 2、 3、 4、 5的透射波段和反射波段如表 2所示。
表 2为具体实例二中各滤波片的透射和反射波段表
Figure imgf000011_0001
Figure imgf000012_0001
从表 2可以看出， 滤波片 1对于 1270nm接收光信号和 1577nm发射光 信号全透射，对于 1310nm、 1490nm光信号全部反射； 滤波片 2对于 1270nm 光信号全反射， 对于 1577nm光信号全部透射； 滤波片 3对于 1490nm光信 号全部反射， 1310nm光信号全部透射； 滤波片 4对于 1270nm光信号全部透 射， 其余波段光信号全部反射； 滤波片 5对于 1310nm光信号全部透射， 其 余波段光信号全部反射。
实施例 2
本实施例提供一种支持两种无源光网络共存的方法， 可依据上述实施例 1的光组件实现。 具体地， 该方法包括：
宽无源光网络的下行光信号，同时发射一路低带宽无源光网络的下行光信号， 经过所述光组件中的滤波片合成一路下行光信号进行发送；
支持两种无源光网络共存的光组件在接收下行光信号时， 通过所述滤波 片将一路下行光信号分离成高带宽无源光网络的下行光信号以及低带宽无源 光网络的下行光信号， 再分别进行接收。
其中， 光组件包括多个滤波片， 通过不同的滤波片可以分离和合成高低 带宽无源光网络中不同波长的光信号。
实际应用中， 在光信号接收方向上， 下行光信号可以依次通过不同的滤 波片后， 依次分离出不同波长的光信号。 下行光信号也可以是先通过一级滤 波片， 分离出两组或多组光信号， 而每组光信号再分别通过相应的二级滤波 片， 分离出相应波长的光信号。
本实施例提出，上述光组件支持 GPON和 XGPON1共存时，可釆用 10G EML 电吸收调制激光器发射高带宽无源光网络的下行光信号、 釆用 2.5G DFB激光器发射低带宽无源光网络的下行光信号、 釆用 2.5G APD探测器接 收高带宽无源光网络的下行光信号、釆用 1.25G APD探测器接收低带宽无源 光网络的下行光信号。 本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本申请不限制于任 何特定形式的硬件和软件的结合。
以上所述， 仅为本发明的较佳实例而已， 并非用于限定本发明的保护范 围。 凡在本发明的精神和原则之内， 所做的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。
工业实用性 从上述实施例可以看出， 本申请技术方案设计了两种无源光网络共存的 OLT光组件， 以 GPON和 XGPONl系统的共存做为优化实施例， 提供了两 种具体的实施用例方案。 既支持传统的 GPON 光组件技术方案， 也支持 XGPONl高速率光组件技术方案。 可以实现系统的平滑升级， 有效降低运营 商的系统升级成本和运维成本。

Claims

权 利 要 求 书
1、 一种支持两种无源光网络共存的光组件， 包括：
高带宽无源光网络的激光发射器、 低带宽无源光网络的激光发射器、 高 带宽无源光网络的探测接收器、 低带宽无源光网络的探测接收器以及在光路 上实现合分光功能的滤波片， 其中： 所述高带宽无源光网络的激光发射器， 设置为： 发射一路高带宽无源光 网络的下行光信号；
所述低带宽无源光网络的激光发射器， 设置为： 发射一路低带宽无源光 网络的下行光信号；
所述滤波片， 设置为： 在光信号发射方向上， 将所述高带宽无源光网络 的激光发射器， 发射的高带宽无源光网络的下行光信号， 以及所述低带宽无 源光网络的激光发射器， 发射的低带宽无源光网络的下行光信号合成一路光 信号， 在光信号接收方向上， 将下行光信号分离成高带宽无源光网络的下行 光信号以及低带宽无源光网络的下行光信号；
所述高带宽无源光网络的探测接收器， 设置为： 通过所述滤波片接收下 行光信号中高带宽无源光网络的下行光信号；
所述低带宽无源光网络的探测接收器， 设置为： 通过所述滤波片接收下 行光信号中低带宽无源光网络的下行光信号。
2、 如权利要求 1所述的光组件， 其中，
所述光组件包括多个滤波片， 其中， 各滤波片分别设置为： 分离和合成 高低带宽无源光网络中不同波长的光信号。
3、 如权利要求 2所述的光组件， 其中， 各滤波片还设置为： 在光信号接 收方向上， 下行光信号依次通过不同的滤波片后， 依次分离出不同波长的光 信号。
4、 如权利要求 2所述的光组件， 其中， 所述滤波片还设置为： 在光信号 接收方向上， 下行光信号通过一级滤波片时， 分离出两组光信号， 每组光信 号分别通过相应的二级滤波片时， 分离出相应波长的光信号。
5、如权利要求 1至 4任一项所述的光组件，其中，所述光组件支持 GPON 和 XGPON1共存时， 所述高带宽无源光网络的激光发射器釆用 10G EML电 吸收调制激光器、 所述低带宽无源光网络的激光发射器釆用 2.5G DFB激光 器、 所述高带宽无源光网络的探测接收器釆用 2.5G APD探测器、 所述低带 宽无源光网络的探测接收器釆用 1.25G APD探测器。
6、 一种支持两种无源光网络共存的方法， 包括： 宽无源光网络的下行光信号，同时发射一路低带宽无源光网络的下行光信号， 经过所述光组件中的滤波片合成一路下行光信号进行发送；
支持两种无源光网络共存的光组件在接收下行光信号时， 通过所述滤波 片将一路下行光信号分离成高带宽无源光网络的下行光信号以及低带宽无源 光网络的下行光信号， 再分别进行接收。
7、 如权利要求 6所述的方法， 其中，
所述光组件包括多个滤波片， 通过不同的滤波片分离和合成高低带宽无 源光网络中不同波长的光信号。
8、 如权利要求 7所述的方法， 其中， 在光信号接收方向上， 下行光信号 依次通过不同的滤波片， 依次分离出不同波长的光信号。
9、 如权利要求 7所述的方法， 其中， 在光信号接收方向上， 下行光信号 通过一级滤波片， 分离出两组光信号， 每组光信号再分别通过相应的二级滤 波片， 分离出相应波长的光信号。
10、如权利要求 6至 9任一项所述的方法，其中，所述光组件支持 GPON 和 XGPON1共存时， 釆用 10G EML电吸收调制激光器发射高带宽无源光网 络的下行光信号、 釆用 2.5G DFB激光器发射低带宽无源光网络的下行光信 号、釆用 2.5G APD探测器接收高带宽无源光网络的下行光信号、釆用 1.25G APD探测器接收低带宽无源光网络的下行光信号。
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