CN101702785B - Multi-wavelength passive optical network system, wavelength reusing method and optical network unit - Google Patents

Multi-wavelength passive optical network system, wavelength reusing method and optical network unit Download PDF

Info

Publication number
CN101702785B
CN101702785B CN200910236737.2A CN200910236737A CN101702785B CN 101702785 B CN101702785 B CN 101702785B CN 200910236737 A CN200910236737 A CN 200910236737A CN 101702785 B CN101702785 B CN 101702785B
Authority
CN
China
Prior art keywords
signal
radio frequency
optical
uplink
uplink service
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN200910236737.2A
Other languages
Chinese (zh)
Other versions
CN101702785A (en
Inventor
张民
卢炼
陈雪
张治国
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing University of Posts and Telecommunications
Original Assignee
Beijing University of Posts and Telecommunications
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing University of Posts and Telecommunications filed Critical Beijing University of Posts and Telecommunications
Priority to CN200910236737.2A priority Critical patent/CN101702785B/en
Publication of CN101702785A publication Critical patent/CN101702785A/en
Application granted granted Critical
Publication of CN101702785B publication Critical patent/CN101702785B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Optical Communication System (AREA)

Abstract

本发明提供一种多波长无源光网络系统、波长重用的方法及光网络单元,该系统包括:光线路终端、波分复用模块和一个或多个光网络单元,该光线路终端,用于发送多波长下行信号,及接收光网络单元发送的上行信号;光网络单元包括:第一光分支模块,用于将光线路终端发送的多波长下行信号中、预定波长的下行信号分成第一路和第二路;下行信号接收模块,用于接收第一路的下行信号;上行信号调制模块,用于将第二路的下行信号作为光网络单元射频上行业务信号的调制光源,对光网络单元的上行信号进行调制,并将调制得到的上行射频光信号发送至光线路终端。利用本技术方案,可实现仅由光线路终端提供整个系统的光信号源,光网络单元侧就不需要再配置光源。

Figure 200910236737

The present invention provides a multi-wavelength passive optical network system, a wavelength reuse method, and an optical network unit. The system includes: an optical line terminal, a wavelength division multiplexing module, and one or more optical network units. The optical line terminal is used for For sending multi-wavelength downlink signals and receiving uplink signals sent by the optical network unit; the optical network unit includes: a first optical branching module, which is used to split the downlink signals of predetermined wavelengths among the multi-wavelength downlink signals sent by the optical line terminal into the first road and the second road; the downlink signal receiving module is used to receive the downlink signal of the first road; the uplink signal modulation module is used to use the downlink signal of the second road as the modulated light source of the radio frequency uplink service signal of the optical network unit, for the optical network The uplink signal of the unit is modulated, and the modulated uplink radio frequency optical signal is sent to the optical line terminal. By using the technical solution, only the optical line terminal can provide the optical signal source of the whole system, and no light source needs to be configured on the optical network unit side.

Figure 200910236737

Description

多波长无源光网络系统、波长重用的方法及光网络单元Multi-wavelength passive optical network system, wavelength reuse method and optical network unit

技术领域 technical field

本发明涉及无源光网络技术领域,特别是涉及一种多波长无源光网络系统、波长重用的方法及光网络单元。The invention relates to the technical field of passive optical networks, in particular to a multi-wavelength passive optical network system, a wavelength reuse method and an optical network unit.

背景技术 Background technique

目前,宽带接入网的线路速率已达到G比特/秒(Gbit/s)量级,而带宽需求和用户数仍在不断增长。传统的基于时分复用的无源光网络(Time-DivisionMultiplexing Passive Optical Network,TDM-PON)由于带宽被大量用户以时分复用机制共享而难以满足不断增长的带宽需求。另外,TDM-PON系统允许的光功率预算有限,限制了PON的分路能力和有效覆盖范围,即光网络单元(Optical Network Unit,ONU)的数量及其与光线路终端(Optical Line TerminalOLT)之间的距离。相比之下,多波长无源光网络(Wavelength DivisionMultiplexing Passive Optical Network,WDM-PON)通过多波长技术而成倍地扩大网络带宽,具有高速率、易升级等优点,被认为是光接入网理想的升级扩容解决方案。At present, the line rate of the broadband access network has reached the order of Gbit/s (Gbit/s), but the demand for bandwidth and the number of users are still increasing. Traditional Time-Division Multiplexing Passive Optical Network (TDM-PON) based on Time-Division Multiplexing Passive Optical Network (TDM-PON) is difficult to meet the ever-increasing bandwidth demand because the bandwidth is shared by a large number of users with a time-division multiplexing mechanism. In addition, the optical power budget allowed by the TDM-PON system is limited, which limits the branching capability and effective coverage of PON, that is, the number of Optical Network Units (Optical Network Unit, ONU) and the distance between them and the Optical Line Terminal (OLT). distance between. In contrast, the multi-wavelength passive optical network (Wavelength Division Multiplexing Passive Optical Network, WDM-PON) doubles the network bandwidth through multi-wavelength technology, has the advantages of high speed and easy upgrade, and is considered an optical access network. Ideal solution for upgrading and expanding capacity.

接入网对成本非常敏感,所以现已提出的WDM-PON方案存在成本高和波长配置机制复杂等突出问题。例如,现已提出的WDM-PON方案需要为各个ONU配置相应波长的光源模块。也就是说,在整个网络系统的实施中,需为大量ONU配置不同波长的光源模块。这样,不但增加了成本,也不利于系统部署的大规模实现及维护。另外,对OLT而言,不能够灵活地管理配置整个网络系统的波长,造成网络波长资源利用率低,同时也不利于网络的优化。The access network is very sensitive to cost, so the proposed WDM-PON solution has outstanding problems such as high cost and complicated wavelength configuration mechanism. For example, the proposed WDM-PON solution needs to configure light source modules with corresponding wavelengths for each ONU. That is to say, in the implementation of the entire network system, light source modules with different wavelengths need to be configured for a large number of ONUs. This not only increases the cost, but also is not conducive to large-scale implementation and maintenance of system deployment. In addition, for the OLT, it is impossible to flexibly manage and configure the wavelengths of the entire network system, resulting in low utilization of network wavelength resources, and it is also not conducive to network optimization.

发明内容 Contents of the invention

本发明的目的是提供一种可实现波长重用的多波长无源光网络系统、实现波长重用的方法及光网络单元,以解决现有技术的多波长无源光网络结构中,需要为各个ONU配置相应波长的光源模块,导致成本增加及网络波长资源利用率低的技术问题。The purpose of the present invention is to provide a multi-wavelength passive optical network system capable of realizing wavelength reuse, a method for realizing wavelength reuse and an optical network unit, so as to solve the problem of the need for each ONU in the multi-wavelength passive optical network structure of the prior art. Configuring light source modules with corresponding wavelengths leads to technical problems such as increased costs and low utilization of network wavelength resources.

为了实现上述目的,本发明提供了一种多波长无源光网络系统,包括:光线路终端、波分复用模块、和一个或多个光网络单元,其特征在于,In order to achieve the above object, the present invention provides a multi-wavelength passive optical network system, including: an optical line terminal, a wavelength division multiplexing module, and one or more optical network units, characterized in that,

所述光线路终端,用于发送多波长下行信号,及接收所述光网络单元发送的上行射频光信号;The optical line terminal is used to send multi-wavelength downlink signals and receive uplink radio frequency optical signals sent by the optical network unit;

所述波分复用模块,与所述光线路终端和所述各光网络单元相连接,用于将所述光线路终端发送的所述多波长下行信号分解为对应于各个光网络单元的各个单波长下行信号,发送至对应光网络单元,并将来自各个光网络单元的单波长上行射频光信号合波后,发送至所述光线路终端;The wavelength division multiplexing module is connected to the optical line terminal and the optical network units, and is used to decompose the multi-wavelength downlink signal sent by the optical line terminal into individual signals corresponding to each optical network unit. The single-wavelength downlink signal is sent to the corresponding optical network unit, and the single-wavelength uplink radio frequency optical signal from each optical network unit is combined and sent to the optical line terminal;

所述光网络单元中的每一个包括:Each of the optical network units includes:

第一光分支模块,用于将所述光线路终端发送的多波长下行信号中、预定波长的下行信号分成第一路和第二路;A first optical branching module, configured to divide the downlink signal of a predetermined wavelength among the multi-wavelength downlink signals sent by the optical line terminal into a first path and a second path;

下行信号接收模块,用于接收所述第一路下行信号;a downlink signal receiving module, configured to receive the first downlink signal;

上行信号调制模块,用于将所述第二路下行信号作为所述上行信号调制模块所属光网络单元的射频上行业务信号的调制光源,对所述射频上行业务信号进行调制,并将调制得到的上行射频光信号通过所述第一光分支模块发送至所述波分复用模块,由所述波分复用模块发送至所述光线路终端。An uplink signal modulation module, configured to use the second downlink signal as a modulation light source for the radio frequency uplink service signal of the optical network unit to which the uplink signal modulation module belongs, modulate the radio frequency uplink service signal, and modulate the obtained The uplink radio frequency optical signal is sent to the wavelength division multiplexing module through the first optical branching module, and is sent to the optical line terminal by the wavelength division multiplexing module.

优选地,所述的多波长无源光网络系统,其中,所述每一个光网络单元还包括:Preferably, in the multi-wavelength passive optical network system, each optical network unit further includes:

电域处理模块,用于获得两路具有预定相位差、且携带上行业务数据的同频射频上行业务信号:第三路射频上行业务信号和第四路射频上行业务信号;An electrical domain processing module, configured to obtain two same-frequency radio frequency uplink service signals with a predetermined phase difference and carrying uplink service data: a third radio frequency uplink service signal and a fourth radio frequency uplink service signal;

所述上行信号调制模块,进一步用于将所述第二路的下行信号分成第五路和第六路,将所述第五路和第六路的下行信号分别作为所述第三路和第四路射频上行业务信号的调制光源,分别对所述第三路和第四路射频上行业务信号进行调制,调制后获得两路具有预定相位差的上行射频光信号,将所述两路调制得到的上行射频光信号耦合,并将耦合得到的上行射频光信号发送至所述光线路终端。The uplink signal modulation module is further configured to divide the downlink signal of the second path into a fifth path and a sixth path, and use the downlink signal of the fifth path and the sixth path as the third path and the sixth path respectively. Modulating light sources for four radio frequency uplink service signals respectively modulate the third and fourth radio frequency uplink service signals, obtain two uplink radio frequency optical signals with a predetermined phase difference after modulation, and modulate the two channels to obtain The uplink radio frequency optical signal is coupled, and the coupled uplink radio frequency optical signal is sent to the optical line terminal.

优选地,所述的多波长无源光网络系统,其中,所述上行信号调制模块包括:Preferably, the multi-wavelength passive optical network system, wherein the uplink signal modulation module includes:

第二光分支模块,包括第三分支和第四分支,用于在下行方向将所述第二路下行信号分成均匀的第五路和第六路,所述第五路信号通过所述第三分支传输,所述第六路信号通过所述第四分支传输;The second optical branching module, including a third branch and a fourth branch, is used to divide the second downlink signal into uniform fifth and sixth paths in the downlink direction, and the fifth path signal passes through the third Branch transmission, the sixth signal is transmitted through the fourth branch;

第一反射型半导体光放大器,与所述第二光分支模块的第三分支及所述电域处理模块相连接,用于以所述第五路的下行信号作为调制光源对所述第三路射频上行业务信号进行调制,并输出调制得到的第一上行射频光信号;The first reflective semiconductor optical amplifier is connected to the third branch of the second optical branching module and the electrical domain processing module, and is used to use the downlink signal of the fifth path as a modulated light source for the third path Modulating the radio frequency uplink service signal, and outputting the modulated first uplink radio frequency optical signal;

第二反射型半导体光放大器,与所述第二光分支模块的第四分支及所述电路域模块相连接,用于以所述第六路的下行信号作为调制光源对所述第四路射频上行业务信号进行调制,并输出调制得到的第二上行射频光信号;The second reflective semiconductor optical amplifier is connected to the fourth branch of the second optical branch module and the circuit domain module, and is used to use the downlink signal of the sixth path as a modulation light source to transmit the radio frequency of the fourth path modulate the uplink service signal, and output the modulated second uplink radio frequency optical signal;

所述第二光分支模块,进一步用于将所述第一上行射频光信号和第二上行射频光信号进行耦合,并将耦合得到的上行射频光信号通过所述第一光分支模块发送至所述光线路终端。The second optical branching module is further configured to couple the first uplink radio frequency optical signal and the second uplink radio frequency optical signal, and send the coupled uplink radio frequency optical signal to the Described optical line terminal.

优选地,所述的多波长无源光网络系统,其中,所述上行信号调制模块为:辅以反射型半导体光放大器的波导型迈克尔逊干涉仪,所述第一、第二反射型半导体光放大器分别位于所述波导型迈克尔逊干涉仪的上下两臂。Preferably, in the multi-wavelength passive optical network system, the uplink signal modulation module is: a waveguide Michelson interferometer supplemented with a reflective semiconductor optical amplifier, and the first and second reflective semiconductor optical The amplifiers are respectively located at the upper and lower arms of the waveguide Michelson interferometer.

优选地,所述的多波长无源光网络系统,其中,当所述光网络单元的上行业务信号为基带上行业务信号时,所述电域处理模块包括:Preferably, in the multi-wavelength passive optical network system, when the uplink service signal of the optical network unit is a baseband uplink service signal, the electrical domain processing module includes:

射频信号源,用于产生两路同频同相的射频载波信号;The radio frequency signal source is used to generate two radio frequency carrier signals of the same frequency and phase;

第一相移模块,与所述射频信号源相连接,用于对所述两路射频载波信号的相位差进行调节,获得具有预定相位差的第一射频载波信号和第二射频载波信号;The first phase shift module is connected to the radio frequency signal source and is used to adjust the phase difference of the two radio frequency carrier signals to obtain a first radio frequency carrier signal and a second radio frequency carrier signal with a predetermined phase difference;

调制模块,用于将所述基带上行业务信号分成两路,并将所述两路基带上行业务信号分别调制到所述第一射频载波信号和第二射频载波信号上,获得携带所述基带上行业务信号数据的所述第三射频上行业务信号和第四射频上行业务信号。a modulation module, configured to divide the baseband uplink service signal into two paths, and modulate the two paths of baseband uplink service signal onto the first radio frequency carrier signal and the second radio frequency carrier signal respectively, so as to obtain the baseband uplink service signal carrying the baseband The third radio frequency uplink service signal and the fourth radio frequency uplink service signal of service signal data.

优选地,所述的多波长无源光网络系统,其中,所述第三路射频上行业务信号和第四路射频上行业务信号的相位差为:0度、90度或180度。Preferably, in the multi-wavelength passive optical network system, the phase difference between the third radio frequency uplink service signal and the fourth radio frequency uplink service signal is: 0 degrees, 90 degrees or 180 degrees.

优选地,所述的多波长无源光网络系统,其中,所述上行信号调制模块还包括:Preferably, the multi-wavelength passive optical network system, wherein the uplink signal modulation module further includes:

第二相移模块,设置在所述第二光分支模块的第三分支或第四分支上,用于将所述第一上行射频光信号和第二上行射频光信号的相位差调节到预定值。The second phase shift module is arranged on the third branch or the fourth branch of the second optical branching module, and is used to adjust the phase difference between the first uplink radio frequency optical signal and the second uplink radio frequency optical signal to a predetermined value .

优选地,所述的多波长无源光网络系统,其中,当所述光网络单元的上行业务信号为射频上行业务信号时,所述电域处理模块包括:Preferably, in the multi-wavelength passive optical network system, when the uplink service signal of the optical network unit is a radio frequency uplink service signal, the electrical domain processing module includes:

第三相移模块,用于对分成两路传输的射频上行业务信号进行相位调节,以获得具有预定相位差的所述第三路射频上行业务信号和第四路射频上行业务信号。The third phase shifting module is configured to adjust the phase of the radio frequency uplink service signal divided into two channels to obtain the third radio frequency uplink service signal and the fourth radio frequency uplink service signal with a predetermined phase difference.

优选地,所述的多波长无源光网络系统,其中,所述光网络单元中的每一个还包括:Preferably, in the multi-wavelength passive optical network system, each of the optical network units further includes:

光信号隔离器,与所述第一光分支模块和所述下行信号接收模块相连接,用于直通所述第一路下行信号至所述下行信号接收模块,及阻止所述下行信号接收模块反射回来的光信号。An optical signal isolator, connected to the first optical branch module and the downlink signal receiving module, is used to directly pass the first downlink signal to the downlink signal receiving module, and prevent the downlink signal receiving module from reflecting back light signal.

优选地,所述的多波长无源光网络系统,其中,所述光线路终端发送模块发送的多波长下行信号为:对多路单波长下行信号进行直接强度调制后形成的多波长下行信号。Preferably, in the multi-wavelength passive optical network system, the multi-wavelength downlink signal sent by the optical line terminal sending module is: a multi-wavelength downlink signal formed by performing direct intensity modulation on multiple single-wavelength downlink signals.

另一方面,提供一种多波长无源光网络系统实现波长重用的方法,其中,包括:On the other hand, a method for realizing wavelength reuse in a multi-wavelength passive optical network system is provided, which includes:

步骤A,光网络单元将光线路终端发送的预定波长的下行信号分成第一路和第二路;Step A, the optical network unit divides the downlink signal of a predetermined wavelength sent by the optical line terminal into a first path and a second path;

步骤B,光网络单元接收所述第一路下行信号,并将所述第二路下行信号作为用于调制射频上行业务信号的调制光源,在对所述射频上行业务信号调制后,获得上行射频光信号,并将所述上行射频光信号发送至所述光线路终端。Step B, the optical network unit receives the first downlink signal, and uses the second downlink signal as a modulation light source for modulating the radio frequency uplink service signal, and obtains the uplink radio frequency after modulating the radio frequency uplink service signal an optical signal, and send the uplink radio frequency optical signal to the optical line terminal.

优选地,所述的方法,其中,所述步骤B包括:Preferably, said method, wherein said step B comprises:

步骤B1,获得两路具有预定相位差、且携带上行业务信号数据的同频射频上行业务信号:第三路射频上行业务信号和第四路射频上行业务信号;Step B1, obtaining two same-frequency radio frequency uplink service signals with a predetermined phase difference and carrying uplink service signal data: a third radio frequency uplink service signal and a fourth radio frequency uplink service signal;

步骤B2,将所述第二路下行信号分成第五路和第六路,并将所述第五路和第六路下行信号分别作为所述第三路和第四路射频上行业务信号的调制光源,分别对所述第三路和第四路射频上行业务信号进行调制,调制后获得的两路具有预定相位差的上行射频光信号,将所述具有预定相位差的两路调制后的上行射频光信号耦合,并将耦合得到的上行射频光信号发送至所述光线路终端。Step B2, dividing the second downlink signal into fifth and sixth downlink signals, and using the fifth and sixth downlink signals as the modulation of the third and fourth radio frequency uplink service signals respectively The light source modulates the third and fourth radio frequency uplink service signals respectively, obtains two uplink radio frequency optical signals with a predetermined phase difference after modulation, and converts the two modulated uplink radio signals with a predetermined phase difference The radio frequency optical signal is coupled, and the coupled uplink radio frequency optical signal is sent to the optical line terminal.

优选地,所述的方法,其中,当所述光网络单元的上行业务信号为基带上行业务信号时,所述步骤B1包括:Preferably, the method, wherein, when the uplink service signal of the optical network unit is a baseband uplink service signal, the step B1 includes:

利用射频信号源产生两路同频同相的射频载波信号;Use the RF signal source to generate two RF carrier signals with the same frequency and phase;

利用第一相移模块对所述两路射频载波信号的相位差进行调节,获得具有预定相位差的第一射频载波信号和第二射频载波信号;Using the first phase shift module to adjust the phase difference of the two radio frequency carrier signals to obtain a first radio frequency carrier signal and a second radio frequency carrier signal with a predetermined phase difference;

将光网络单元发送的所述基带上行业务信号分成两路,将所述两路基带上行业务信号分别调制到所述第一射频载波信号和第二射频载波信号上,获得携带所述基带上行业务信号数据的所述第三射频上行业务信号和第四射频上行业务信号。Divide the baseband uplink service signal sent by the optical network unit into two paths, modulate the two paths of baseband uplink service signal onto the first radio frequency carrier signal and the second radio frequency carrier signal respectively, and obtain the baseband uplink service carrying the The third radio frequency uplink service signal and the fourth radio frequency uplink service signal of signal data.

优选地,所述的方法,其中,当所述光网络单元的上行业务信号为射频上行业务信号时,所述步骤B1包括:Preferably, the method, wherein, when the uplink service signal of the optical network unit is a radio frequency uplink service signal, the step B1 includes:

将所述射频上行业务信号分成两路;dividing the radio frequency uplink service signal into two paths;

利用第三相移模块对所述两路射频上行业务信号的相位差进行调节,获得具有预定相位差的所述第三路射频上行业务信号和第四路射频上行业务信号。Using the third phase shift module to adjust the phase difference of the two radio frequency uplink service signals to obtain the third radio frequency uplink service signal and the fourth radio frequency uplink service signal with a predetermined phase difference.

优选地,所述的方法,其中,所述光网络单元通过上行信号调制模块来实现上述步骤B,所述上行信号调制模块包括:Preferably, the method, wherein the optical network unit implements the above step B through an uplink signal modulation module, and the uplink signal modulation module includes:

第二光分支模块,包括第三分支和第四分支,用于将所述第二路下行信号分成第五路和第六路,所述第五路信号通过所述第三分支传输,所述第六路信号通过所述第四分支传输;The second optical branching module includes a third branch and a fourth branch, configured to divide the second downlink signal into a fifth path and a sixth path, the fifth path signal is transmitted through the third branch, and the The sixth signal is transmitted through the fourth branch;

第一反射型半导体光放大器,与所述第二光分支模块的第三分支相连接,用于以所述第五路的下行信号作为调制光源对所述第三路射频上行业务信号进行调制,并输出调制得到的第一上行射频光信号;The first reflective semiconductor optical amplifier is connected to the third branch of the second optical branch module, and is used to modulate the third radio frequency uplink service signal by using the fifth downlink signal as a modulation light source, and output the modulated first uplink radio frequency optical signal;

第二反射型半导体光放大器,与所述第二光分支模块的第四分支相连接,用于以所述第六路的下行信号作为调制光源对所述第四路射频上行业务信号进行调制,并输出调制得到的第二上行射频光信号;The second reflective semiconductor optical amplifier is connected to the fourth branch of the second optical branch module, and is used to modulate the fourth radio frequency uplink service signal by using the sixth downlink signal as a modulation light source, and output the modulated second uplink radio frequency optical signal;

所述第二光分支模块,进一步用于将所述第一上行射频光信号和第二上行射频光信号进行耦合,并将耦合得到的上行射频光信号发送至所述光线路终端。The second optical branching module is further configured to couple the first uplink radio frequency optical signal and the second uplink radio frequency optical signal, and send the coupled uplink radio frequency optical signal to the optical line terminal.

又一方面,提供一种光网络单元,其中,包括:In yet another aspect, an optical network unit is provided, including:

第一光分支模块,用于将光线路终端发送的多波长下行信号中、预定波长的下行信号分成第一路和第二路;The first optical branching module is configured to divide the downlink signal of a predetermined wavelength among the multi-wavelength downlink signals sent by the optical line terminal into a first path and a second path;

下行信号接收模块,用于接收所述第一路下行信号;a downlink signal receiving module, configured to receive the first downlink signal;

上行信号调制模块,用于将所述第二路下行信号作为所述上行信号调制模块所属光网络单元的射频上行业务信号的调制光源,对所述射频上行业务信号进行调制,并将调制得到的上行射频光信号发送至所述光线路终端。An uplink signal modulation module, configured to use the second downlink signal as a modulation light source for the radio frequency uplink service signal of the optical network unit to which the uplink signal modulation module belongs, modulate the radio frequency uplink service signal, and modulate the obtained The uplink radio frequency optical signal is sent to the optical line terminal.

优选地,所述的光网络单元,其中,还包括:Preferably, the optical network unit further includes:

电域处理模块,用于获得两路具有预定相位差、且携带上行业务数据的同频射频上行业务信号:第三路射频上行业务信号和第四路射频上行业务信号;An electrical domain processing module, configured to obtain two same-frequency radio frequency uplink service signals with a predetermined phase difference and carrying uplink service data: a third radio frequency uplink service signal and a fourth radio frequency uplink service signal;

所述上行信号调制模块,进一步用于将所述第二路的下行信号分成第五路和第六路,将所述第五路和第六路的下行信号分别作为所述第三路和第四路射频上行业务信号的调制光源,分别对所述第三路和第四路射频上行业务信号进行调制,获得具有预定相位差的两路调制后的上行射频光信号,将所述具有预定相位差的两路调制后的上行射频光信号耦合,并将耦合得到的上行射频光信号发送至所述光线路终端。The uplink signal modulation module is further configured to divide the downlink signal of the second path into a fifth path and a sixth path, and use the downlink signal of the fifth path and the sixth path as the third path and the sixth path respectively. Modulating light sources for four radio frequency uplink service signals respectively modulate the third and fourth radio frequency uplink service signals to obtain two modulated uplink radio frequency optical signals with a predetermined phase difference, and convert the modulated uplink radio frequency optical signals with a predetermined phase difference Coupling the modulated uplink radio frequency optical signals of the two channels, and sending the coupled uplink radio frequency optical signals to the optical line terminal.

优选地,所述的光网络单元,其中,所述上行信号调制模块包括:Preferably, the optical network unit, wherein the uplink signal modulation module includes:

第二光分支模块,包括第三分支和第四分支,用于在下行方向将所述第二路下行信号分成均匀的第五路和第六路,所述第五路信号通过所述第三分支传输,所述第六路信号通过所述第四分支传输;The second optical branching module, including a third branch and a fourth branch, is used to divide the second downlink signal into uniform fifth and sixth paths in the downlink direction, and the fifth path signal passes through the third Branch transmission, the sixth signal is transmitted through the fourth branch;

第一反射型半导体光放大器,与所述第二光分支模块的第三分支及所述电域处理模块相连接,用于以所述第五路的下行信号作为调制光源对所述第三路射频上行业务信号进行调制,并输出调制得到的第一上行射频光信号;The first reflective semiconductor optical amplifier is connected to the third branch of the second optical branching module and the electrical domain processing module, and is used to use the downlink signal of the fifth path as a modulated light source for the third path Modulating the radio frequency uplink service signal, and outputting the modulated first uplink radio frequency optical signal;

第二反射型半导体光放大器,与所述第二光分支模块的第四分支及所述电路域模块相连接,用于以所述第六路的下行信号作为调制光源对所述第四路射频上行业务信号进行调制,并输出调制得到的第二上行射频光信号;The second reflective semiconductor optical amplifier is connected to the fourth branch of the second optical branch module and the circuit domain module, and is used to use the downlink signal of the sixth path as a modulation light source to transmit the radio frequency of the fourth path modulate the uplink service signal, and output the modulated second uplink radio frequency optical signal;

所述第二光分支模块,进一步用于将所述第一上行射频光信号和第二上行射频光信号进行耦合,并将耦合得到的上行射频光信号通过所述第一光分支模块发送至所述光线路终端。The second optical branching module is further configured to couple the first uplink radio frequency optical signal and the second uplink radio frequency optical signal, and send the coupled uplink radio frequency optical signal to the Described optical line terminal.

优选地,所述的光网络单元,其中,所述上行信号调制模块为:辅以反射型半导体光放大器的波导型迈克尔逊干涉仪,所述第一、第二反射型半导体光放大器分别位于所述波导型迈克尔逊干涉仪的上下两臂。Preferably, the optical network unit, wherein the uplink signal modulation module is: a waveguide Michelson interferometer supplemented with a reflective semiconductor optical amplifier, and the first and second reflective semiconductor optical amplifiers are respectively located in the The upper and lower arms of the waveguide-type Michelson interferometer.

优选地,所述的光网络单元,其中,当所述光网络单元的上行业务信号为基带上行业务信号时,所述电域处理模块包括:Preferably, in the optical network unit, when the uplink service signal of the optical network unit is a baseband uplink service signal, the electrical domain processing module includes:

射频信号源,用于产生两路同频同相的射频载波信号;The radio frequency signal source is used to generate two radio frequency carrier signals of the same frequency and phase;

第一相移模块,与所述射频信号源相连接,用于对所述两路射频载波信号的相位差进行调节,获得具有预定相位差的第一射频载波信号和第二射频载波信号;The first phase shift module is connected to the radio frequency signal source and is used to adjust the phase difference of the two radio frequency carrier signals to obtain a first radio frequency carrier signal and a second radio frequency carrier signal with a predetermined phase difference;

调制模块,用于将所述基带上行业务信号分成两路,并将所述两路基带上行信号分别调制到所述第一射频载波信号和第二射频载波信号上,获得携带所述基带上行业务信号数据的所述第三路射频上行业务信号和第四路射频上行业务信号。A modulating module, configured to divide the baseband uplink service signal into two paths, and modulate the two paths of baseband uplink signal to the first radio frequency carrier signal and the second radio frequency carrier signal respectively, so as to obtain the baseband uplink service carrying The third radio frequency uplink service signal and the fourth radio frequency uplink service signal of the signal data.

优选地,所述的光网络单元,其中,所述第三路射频上行业务信号和第四路射频上行业务信号的相位差为:0度、90度或180度。Preferably, in the optical network unit, the phase difference between the third radio frequency uplink service signal and the fourth radio frequency uplink service signal is: 0 degrees, 90 degrees or 180 degrees.

上述技术方案中的一个技术方案具有如下技术效果:One of the above technical solutions has the following technical effects:

通过在光网络单元ONU处采用上行信号调制模块,可实现仅由光线路终端OLT提供整个系统的光信号源,利用下行光信号作为ONU侧射频上行业务信号的调制光源,在下行光信号经ONU侧时重用并加载上行信号,再送回到OLT,这样,ONU侧利用OLT指配的波长,不需要再配置光源模块,从而节省了成本,并实现了ONU的无色化,即ONU具有了波长自适应性;By adopting the uplink signal modulation module at the ONU, only the optical line terminal OLT can provide the optical signal source of the whole system, and the downlink optical signal can be used as the modulation light source of the radio frequency uplink service signal on the ONU side. The ONU side reuses and loads the upstream signal, and then sends it back to the OLT. In this way, the ONU side uses the wavelength assigned by the OLT, and does not need to configure a light source module, thereby saving costs and realizing the colorless ONU, that is, the ONU has a wavelength adaptability;

进一步地,由于下行基带信号与具有一定频移的上行射频光信号在频域上是错开的,所以能够进行单纤双向传输,从而真正实现整个多波长无源光网络的全双工工作。Furthermore, since the downlink baseband signal and the uplink radio frequency optical signal with a certain frequency shift are staggered in the frequency domain, single-fiber bidirectional transmission can be performed, thereby truly realizing the full-duplex operation of the entire multi-wavelength passive optical network.

附图说明 Description of drawings

图1为本发明一实施例的多波长无源光网络系统的结构示意图;FIG. 1 is a schematic structural diagram of a multi-wavelength passive optical network system according to an embodiment of the present invention;

图2为本发明另一实施例的多波长无源光网络系统的结构示意图;2 is a schematic structural diagram of a multi-wavelength passive optical network system according to another embodiment of the present invention;

图3为本发明又一实施例的多波长无源光网络系统的结构示意图;3 is a schematic structural diagram of a multi-wavelength passive optical network system according to another embodiment of the present invention;

图4为本发明实施例的光网络单元的结构示意图;FIG. 4 is a schematic structural diagram of an optical network unit according to an embodiment of the present invention;

图5为本发明又一实施例的多波长无源光网络系统的结构示意图;5 is a schematic structural diagram of a multi-wavelength passive optical network system according to another embodiment of the present invention;

图6为本发明图4所示的实施例中,射频5GHz的上行信号经RSOA-MI结构输出的光谱图;Fig. 6 is the spectrum diagram outputted by the uplink signal of the radio frequency 5 GHz through the RSOA-MI structure in the embodiment shown in Fig. 4 of the present invention;

图7为本发明图4所示的实施例中,射频32GHz的上行信号经RSOA-MI结构输出的光谱图;Fig. 7 is the spectrum diagram outputted by the uplink signal of the radio frequency 32 GHz through the RSOA-MI structure in the embodiment shown in Fig. 4 of the present invention;

图8为本发明实施例中,光线路终端多个无源光网络PON模块级联的结构示意图;8 is a schematic structural diagram of cascading multiple passive optical network PON modules of an optical line terminal in an embodiment of the present invention;

图9为本发明实施例的多波长无源光网络系统实现波长重用的方法的流程示意图。FIG. 9 is a schematic flowchart of a method for implementing wavelength reuse in a multi-wavelength passive optical network system according to an embodiment of the present invention.

具体实施方式 Detailed ways

为使本发明的目的、技术方案和优点更加清楚,下面将结合附图及具体实施例对本发明进行详细描述。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

图1为本发明一实施例的多波长无源光网络系统的结构示意图。如图1,本发明实施例的多波长无源光网络系统包括:光线路终端101、波分复用模块102和一个或多个光网络单元103,其中,FIG. 1 is a schematic structural diagram of a multi-wavelength passive optical network system according to an embodiment of the present invention. As shown in Fig. 1, the multi-wavelength passive optical network system of the embodiment of the present invention includes: an optical line terminal 101, a wavelength division multiplexing module 102, and one or more optical network units 103, wherein,

所述光线路终端,用于发送多波长下行信号,及接收所述光网络单元发送的上行射频光信号;The optical line terminal is used to send multi-wavelength downlink signals and receive uplink radio frequency optical signals sent by the optical network unit;

所述波分复用模块,与所述光线路终端和所述各光网络单元相连接,用于将所述光线路终端发送的所述多波长下行信号分解为对应于各个光网络单元的各个单波长下行信号,发送至对应光网络单元,并将来自各个光网络单元的单波长上行射频光信号合波后,发送至所述光线路终端;The wavelength division multiplexing module is connected to the optical line terminal and the optical network units, and is used to decompose the multi-wavelength downlink signal sent by the optical line terminal into individual signals corresponding to each optical network unit. The single-wavelength downlink signal is sent to the corresponding optical network unit, and the single-wavelength uplink radio frequency optical signal from each optical network unit is combined and sent to the optical line terminal;

所述光网络单元中的每一个包括:第一光分支模块104,用于将所述光线路终端发送的多波长下行信号中、预定波长的下行信号分成第一路和第二路;下行信号接收模块105,用于接收所述第一路下行信号,并获得所述下行信号中的下行信号数据,获得OLT发送给用户的目标数据;上行信号调制模块106,用于将所述第二路下行信号作为所述上行信号调制模块所属光网络单元的射频上行业务信号的调制光源,对所述射频上行业务信号进行调制,并将调制得到的上行射频光信号通过第一光分支模块发送至波分复用模块,再由波分复用模块发送至光线路终端。Each of the optical network units includes: a first optical branching module 104, configured to divide the downlink signal of a predetermined wavelength among the multi-wavelength downlink signals sent by the optical line terminal into a first path and a second path; the downlink signal The receiving module 105 is used to receive the first downlink signal, and obtain the downlink signal data in the downlink signal, and obtain the target data sent by the OLT to the user; the uplink signal modulation module 106 is used to convert the second way The downlink signal is used as a modulation light source for the radio frequency uplink service signal of the optical network unit to which the uplink signal modulation module belongs, modulates the radio frequency uplink service signal, and sends the modulated uplink radio frequency optical signal to the wave channel through the first optical branch module Division multiplexing module, and then sent to the optical line terminal by the wavelength division multiplexing module.

本发明实施例的该技术方案通过在光网络单元ONU处采用上行信号调制模块,可实现仅由光线路终端OLT提供整个系统的光信号源,利用下行光信号作为ONU侧射频上行业务信号的调制光源,在下行光信号经ONU侧时重用并加载上行业务信号,再送回到OLT,这样,由OLT指配波长,ONU侧就不需要再配置光源模块,从而实现了ONU的无色化,即ONU具有了波长自适应性。In the technical solution of the embodiment of the present invention, by adopting the upstream signal modulation module at the optical network unit ONU, only the optical line terminal OLT can provide the optical signal source of the entire system, and use the downstream optical signal as the modulation of the radio frequency upstream service signal on the ONU side The light source is reused when the downlink optical signal passes through the ONU side and loaded with the uplink service signal, and then sent back to the OLT. In this way, the wavelength is assigned by the OLT, and the ONU side does not need to configure a light source module, thus realizing the colorless ONU, that is, ONU has wavelength adaptability.

在本发明的实施例中,具体哪个光网络单元对应哪个波长,可由OLT预先指配。In the embodiment of the present invention, which specific optical network unit corresponds to which wavelength may be pre-assigned by the OLT.

优选地,所述的多波长无源光网络系统中,所述每一个光网络单元还包括:电域处理模块,用于获得两路具有预定相位差、且携带上行业务数据的同频射频上行业务信号:第三路射频上行业务信号和第四路射频上行业务信号;所述上行信号调制模块,进一步用于将所述第二路的下行信号分成第五路和第六路,将所述第五路和第六路的下行信号分别作为所述第三路和第四路射频上行业务信号的调制光源,分别对所述第三路和第四路射频上行业务信号进行调制,获得两路调制得到的、具有预定相位差的上行射频光信号,将所述两路调制得到的上行射频光信号耦合,并将耦合得到的上行射频光信号发送至所述光线路终端。Preferably, in the multi-wavelength passive optical network system, each optical network unit further includes: an electrical domain processing module, configured to obtain two same-frequency radio frequency uplink channels with a predetermined phase difference and carrying uplink service data Service signals: the third radio frequency uplink service signal and the fourth radio frequency uplink service signal; the uplink signal modulation module is further used to divide the second downlink signal into fifth and sixth channels, and divide the The fifth and sixth downlink signals are respectively used as modulation light sources for the third and fourth radio frequency uplink service signals, and the third and fourth radio frequency uplink service signals are respectively modulated to obtain two channels The modulated uplink radio frequency optical signal with a predetermined phase difference is coupled to the two modulated uplink radio frequency optical signals, and the coupled uplink radio frequency optical signal is sent to the optical line terminal.

优选地,所述的多波长无源光网络系统,其中,所述上行信号调制模块包括:第二光分支模块,包括第三分支和第四分支,用于在下行方向将所述第二路下行信号分成均匀的第五路和第六路,所述第五路信号通过所述第三分支传输,所述第六路信号通过所述第四分支传输;第一反射型半导体光放大器(RSOA,Reflective Semiconductor Optical Amplifier),与所述第二光分支模块的第三分支及所述电域处理模块相连接,用于以所述第五路的下行信号作为调制光源对所述第三路射频上行业务信号进行调制,并输出调制得到的第一上行射频信号;第二反射型半导体光放大器,与所述第二光分支模块的第四分支及所述电路域模块相连接,用于以所述第六路的下行信号作为调制光源对所述第四路射频上行业务信号进行调制,并输出调制得到的第二上行射频光信号;所述第二光分支模块,进一步用于将所述第一上行射频光信号和第二上行射频光信号进行耦合,并将耦合得到的上行射频光信号通过所述第一光分支模块发送至所述光线路终端。Preferably, the multi-wavelength passive optical network system, wherein, the uplink signal modulation module includes: a second optical branch module, including a third branch and a fourth branch, for splitting the second optical branch in the downlink direction The downlink signal is divided into a uniform fifth path and a sixth path, the fifth path signal is transmitted through the third branch, and the sixth path signal is transmitted through the fourth branch; the first reflective semiconductor optical amplifier (RSOA , Reflective Semiconductor Optical Amplifier), connected to the third branch of the second optical branch module and the electrical domain processing module, for using the fifth path downlink signal as a modulation light source to the third path radio frequency The uplink service signal is modulated, and the modulated first uplink radio frequency signal is output; the second reflective semiconductor optical amplifier is connected with the fourth branch of the second optical branch module and the circuit domain module, and is used for using the The sixth downlink signal is used as a modulation light source to modulate the fourth radio frequency uplink service signal, and output the modulated second uplink radio frequency optical signal; the second optical branch module is further used to transfer the first An uplink radio frequency optical signal is coupled with a second uplink radio frequency optical signal, and the coupled uplink radio frequency optical signal is sent to the optical line terminal through the first optical branching module.

图2为本发明另一实施例的多波长无源光网络系统的结构示意图。如图2,本发明该实施例的多波长无源光网络系统包括:一个光线路终端OLT 201、一个波导阵列光栅202和n个光网络单元ONU 203,n为整数。示例性地,ONU的数目n通常可以为16、32、64等。如图2,OLT将λ1至λn的n个波长的下行信号分别发送到n个ONU中。FIG. 2 is a schematic structural diagram of a multi-wavelength passive optical network system according to another embodiment of the present invention. As shown in FIG. 2 , the multi-wavelength passive optical network system of this embodiment of the present invention includes: an optical line terminal OLT 201 , a waveguide array grating 202 and n optical network units ONU 203 , where n is an integer. Exemplarily, the number n of ONUs may generally be 16, 32, 64 and so on. As shown in Figure 2, the OLT sends downlink signals of n wavelengths from λ 1 to λ n to n ONUs respectively.

该实施例中,由OLT提供整个系统的光信号源,在ONU处采用包含RSOA的上行信号的调制部分即上行信号调制模块,以作为调制器的RSOA模块代替光源,下行光信号经ONU侧时被反射和重用并加载射频上行信号即射频上行业务信号形成上行射频光信号,再送回到OLT,因而ONU具有无色性,即具有波长自适应性。下行信号为基带信号,而通过调整耦合前的第一上行射频光信号和第二上行射频光信号的相位差,可实现具有射频单边带SSB、双边带DSB或抑制光载波OCS等特殊调制格式的上行信号,从而在实现全双工的同时,能有效地抑制反向瑞利散射和光纤色散等不利因素。In this embodiment, the optical signal source of the entire system is provided by the OLT, and the modulation part of the upstream signal including the RSOA, that is, the upstream signal modulation module is used at the ONU to replace the light source with the RSOA module as a modulator. When the downstream optical signal passes through the ONU side It is reflected and reused and loaded with radio frequency upstream signals, that is, radio frequency upstream business signals to form upstream radio frequency optical signals, and then sent back to the OLT, so the ONU is colorless, that is, wavelength adaptive. The downlink signal is a baseband signal, and by adjusting the phase difference between the first uplink radio frequency optical signal and the second uplink radio frequency optical signal before coupling, special modulation formats such as radio frequency single sideband SSB, double sideband DSB or suppressed optical carrier OCS can be realized Uplink signal, so that while realizing full duplex, it can effectively suppress unfavorable factors such as back Rayleigh scattering and fiber dispersion.

该例中,波分复用模块为波分复用器,波分复用器又称作WDM复用/解复用器,可利用阵列波导光栅AWG等器件实现,采用1×n的端口结构,其中n为整数,示例性地,n为16、32或64等,其取值与ONU的数量相等。波分复用器将下行多波长光信号分解为对应于各个ONU的各个单波长信号,并将来自各ONU的单波长上行射频光信号复用为一路对应于OLT的多波长上行射频光信号。In this example, the wavelength division multiplexing module is a wavelength division multiplexer, and a wavelength division multiplexer is also called a WDM multiplexer/demultiplexer, which can be realized by using an arrayed waveguide grating (AWG) and other devices, and adopts a 1×n port structure , wherein n is an integer, for example, n is 16, 32 or 64, etc., and its value is equal to the number of ONUs. The wavelength division multiplexer decomposes the downstream multi-wavelength optical signal into individual single-wavelength signals corresponding to each ONU, and multiplexes the single-wavelength upstream radio frequency optical signal from each ONU into one multi-wavelength upstream radio frequency optical signal corresponding to the OLT.

图3为本发明又一实施例的多波长无源光网络系统的结构示意图。图4为本发明实施例的光网络单元的结构示意图。如图3,该实施例中,光线路终端6包括至少一个光线路终端发射模块TX1 61、和光线路终端接收模块RX163;其中,光线路终端发射模块61,用于对下行信号进行激光器的直接调制,从而光线路终端发射模块发送的下行信号为基带信号;光线路终端接收模块63,用于接收上行信号,本发明的技术方案中,用于接收光网络终端发送的上行射频信号,对上行射频信号进行解调及进行预定的处理。FIG. 3 is a schematic structural diagram of a multi-wavelength passive optical network system according to another embodiment of the present invention. FIG. 4 is a schematic structural diagram of an optical network unit according to an embodiment of the present invention. As shown in Fig. 3, in this embodiment, the optical line terminal 6 includes at least one optical line terminal transmitting module TX1 61 and the optical line terminal receiving module RX163; wherein, the optical line terminal transmitting module 61 is used for direct modulation of the laser on the downlink signal , so that the downlink signal sent by the optical line terminal transmitting module is a baseband signal; the optical line terminal receiving module 63 is used to receive the uplink signal. In the technical solution of the present invention, it is used to receive the uplink radio frequency signal sent by the optical network terminal. The signal is demodulated and subjected to predetermined processing.

该例中,光线路终端6中,下行信号在TX1 61中通过直接调制激光器获得,经环形器62注入光纤5进行下行传输。而来自光网络单元,并通过光纤5输出的上行信号经环形器62后,进入RX1 63。In this example, in the optical line terminal 6, the downlink signal is obtained by directly modulating the laser in the TX1 61, and injected into the optical fiber 5 through the circulator 62 for downlink transmission. And from the optical network unit, the uplink signal output through the optical fiber 5 enters the RX1 63 after passing through the circulator 62.

远端节点4主要为波分复用器,可利用现有的阵列波导光栅AWG等器件实现。主要用于在上行方向对来自各ONU的上行信号进行复用即合路,以及在下行方向对来自OLT的下行信号进行分路。The remote node 4 is mainly a wavelength division multiplexer, which can be realized by using an existing arrayed waveguide grating (AWG). It is mainly used to multiplex or combine the upstream signals from each ONU in the upstream direction, and to split the downstream signals from the OLT in the downstream direction.

如图3及图4,光网络单元1包括:1×2光分支器3、下行信号的接收部分2、以及上行信号的调制部分1。该实施例中,上行信号的调制部分1包括:辅以反射型半导体光放大器RSOA的波导型迈克尔逊干涉仪RSOA-MI。该例中,RSOA-MI包括:1×2光分支器3和两个RSOA15、16。As shown in FIG. 3 and FIG. 4 , the optical network unit 1 includes: a 1×2 optical splitter 3 , a receiving part 2 for downlink signals, and a modulation part 1 for uplink signals. In this embodiment, the modulation part 1 of the uplink signal includes: a waveguide Michelson interferometer RSOA-MI supplemented with a reflective semiconductor optical amplifier RSOA. In this example, RSOA-MI includes: 1×2 optical splitter 3 and two RSOAs 15 and 16 .

如图3,箭头表示信号的传输方向,粗线描述的是光路,细线描述的是电域信号的传输通道。下行传输光信号均以“d*”按光下行方向顺次表示,上行传输光信号均以“u*”按光上行方向顺次表示。如图3,具体地,下行信号包括“d1”至“d5”;上行信号包括“u1”至“u5”。As shown in Figure 3, the arrow indicates the transmission direction of the signal, the thick line describes the optical path, and the thin line describes the transmission channel of the electrical domain signal. The optical signals for downlink transmission are all represented by "d * " in sequence according to the direction of optical downlink, and the optical signals for uplink transmission are all represented by "u * " in sequence according to the direction of optical uplink. As shown in FIG. 3 , specifically, the downlink signal includes "d1" to "d5"; the uplink signal includes "u1" to "u5".

下面对该实施例的多波长无源光网络系统实现波长重用的过程进行说明:The process of implementing wavelength reuse in the multi-wavelength passive optical network system of this embodiment is described below:

在下行方向:In the downstream direction:

1×2光分支器3,将预先指定的、与自身所属的光网络单元对应的单波长下行光信号d1分为1∶1的两路:一路d2进入下行信号的接收部分2,经由光信号隔离器21,进入ONU的下行信号接收模块22;另一路d3进入上行信号的调制部分1。在上行信号的调制部分1中,由1×2光分支器18将进入的光信号d3分成均匀的两束d4、d5,分别进入RSOA-MI上下两臂的RSOA 15和RSOA 16中,RSOA因具有增益快速饱和及缓慢恢复特性而对输入的光信号具有幅度钳制作用,被RSOA反射后的光信号幅度变化不大进而用作上行业务信号的调制光源。示例性地,该光分支器18为波导型光分支器。1×2 optical splitter 3, which divides the pre-designated single-wavelength downlink optical signal d1 corresponding to its own optical network unit into two paths of 1:1: one path d2 enters the receiving part 2 of the downlink signal, and passes through the optical signal The isolator 21 enters the downlink signal receiving module 22 of the ONU; the other path d3 enters the modulation part 1 of the uplink signal. In the modulation part 1 of the uplink signal, the 1×2 optical splitter 18 divides the incoming optical signal d3 into two uniform beams d4 and d5, which respectively enter the RSOA 15 and RSOA 16 of the upper and lower arms of the RSOA-MI. It has the characteristics of fast saturation and slow recovery of the gain, and has an amplitude clamping effect on the input optical signal. The amplitude of the optical signal reflected by the RSOA has little change and is used as a modulated light source for the uplink service signal. Exemplarily, the optical splitter 18 is a waveguide type optical splitter.

本发明的实施例中,上行业务数据可以分为两种情况,上行业务数据可以有以下两种情况:(1)光网络单元的上行业务信号为基带上行业务信号时,基带上行业务信号先经ONU的电域处理模块调制到射频,再分为具有适当相位差的两路射频上行业务信号,分别作为两个RSOA的电调制信号;(2)光网络单元的上行业务信号是来自无线业务接入点AP的射频上行业务信号时,将上行的射频上行业务信号分成两路并加上适当的相位差进而作为RSOA的电调制信号。以输入RSOA的下行光信号作为调制光源,将输入RSOA的电调制信号加载在输入RSOA的下行信号后,两路加载了电调制信号的下行光信反射回光分支器18,经光分支器18的耦合后,输出耦合得到的上行射频光信号。其中,上述的耦合是对上述两个RSOA反射回来的两路加载了电调制信号的下行光信号进行光功率合路。In the embodiment of the present invention, the uplink service data can be divided into two situations, and the uplink service data can have the following two situations: (1) when the uplink service signal of the optical network unit is a baseband uplink service signal, the baseband uplink service signal first passes through The electrical domain processing module of the ONU modulates to the radio frequency, and then divides into two radio frequency uplink service signals with an appropriate phase difference, which are respectively used as two RSOA electrical modulation signals; (2) The uplink service signal of the optical network unit is from the wireless service interface When entering the radio frequency uplink service signal of the AP, the uplink radio frequency uplink service signal is divided into two paths and an appropriate phase difference is added to be used as the electrical modulation signal of the RSOA. The downlink optical signal input to the RSOA is used as the modulation light source, the electrical modulation signal input to the RSOA is loaded on the downlink signal input to the RSOA, and the two downlink optical signals loaded with the electrical modulation signal are reflected back to the optical splitter 18, and passed through the optical splitter 18. After coupling, output the coupled uplink radio frequency optical signal. Wherein, the above coupling is to combine the optical power of the two downlink optical signals loaded with the electrical modulation signal reflected back by the above two RSOAs.

图3给出的是上行业务信号为基带上行业务信号时的实施例。如图3,在上行方向:Fig. 3 shows an embodiment when the uplink service signal is a baseband uplink service signal. As shown in Figure 3, in the uplink direction:

射频信号源11产生预定频率的射频载波信号,示例性的产生频率为fs的射频载波信号。该例中,射频信号源产生的射频载波信号分成两路同频同相的射频载波信号,并通过第一相移模块对上述两路射频载波信号的相位差进行调节,获得具有预定相位差的第一射频载波信号和第二射频载波信号。具体实现中,第一相移模块通过调节其中一路射频载波信号的相位,来达到调节两路射频信号的相位差的效果。The radio frequency signal source 11 generates a radio frequency carrier signal with a predetermined frequency, exemplarily generating a radio frequency carrier signal with a frequency fs. In this example, the RF carrier signal generated by the RF signal source is divided into two RF carrier signals with the same frequency and phase, and the phase difference between the above two RF carrier signals is adjusted by the first phase shift module to obtain the second RF carrier signal with a predetermined phase difference. A radio frequency carrier signal and a second radio frequency carrier signal. In a specific implementation, the first phase shift module achieves the effect of adjusting the phase difference of two radio frequency signals by adjusting the phase of one radio frequency carrier signal.

将基带上行业务信号分成均匀的两路,并将两路基带上行业务信号中的上行业务数据分别调制到上述两路同频且具有预定相位差的射频载波信号上,将所得两路射频载波信号,即第一射频载波信号和第二射频载波信号,作为两个RSOA的电调制信号,调制此时作为光源的下行信号,实现射频的副载波调制。具体实现中,通过调制模块来将基带上行业务信号的数据调制到射频载波上,示例性地,通过图3所示的乘法器13、14分别实现将基带上行信号调制到射频载波信号上。Divide the baseband uplink service signals into two even paths, and modulate the uplink service data in the two paths of baseband uplink service signals to the above two paths of radio frequency carrier signals with the same frequency and a predetermined phase difference, and convert the obtained two paths of radio frequency carrier signals into , that is, the first radio frequency carrier signal and the second radio frequency carrier signal, as the electrical modulation signals of the two RSOAs, modulate the downlink signal used as the light source at this time, and realize radio frequency subcarrier modulation. In specific implementation, the modulation module is used to modulate the data of the baseband uplink service signal onto the radio frequency carrier. Exemplarily, the baseband uplink signal is modulated onto the radio frequency carrier signal through the multipliers 13 and 14 shown in FIG. 3 respectively.

在光分支器18处,将两个RSOA反射回来的两束光u1和u2进行耦合后,再回传至光分支器3后继续上行传输。其中,该两束光u1和u2即为加载了电调制信号的第一上行射频光信号和第二上行射频光信号。其中,可以通过第二相移模块17对两路射频载波信号的相位差进行调节,以使得输入光分支器18的光u1和u2具有预定的相位差。通常,在通过第一相移模块设定两路射频载波的相位差后,第二相移模块17起的作用是微调作用,以使得光u1和u2相位差达到预定值得,从而,通过光分支器耦合出的上行射频光信号能够达到预定的要求,如使耦合出的上行射频光信号成为SSB信号。具体实现中,上述相移模块可实现为相移器。At the optical splitter 18 , after coupling the two beams of light u1 and u2 reflected back by the two RSOAs, they are transmitted back to the optical splitter 3 to continue uplink transmission. Wherein, the two beams of light u1 and u2 are the first uplink radio frequency optical signal and the second uplink radio frequency optical signal loaded with the electrical modulation signal. Wherein, the phase difference of the two radio frequency carrier signals can be adjusted by the second phase shift module 17, so that the light u1 and u2 input to the optical splitter 18 have a predetermined phase difference. Usually, after the phase difference between the two radio frequency carriers is set by the first phase shift module, the second phase shift module 17 plays the role of fine-tuning, so that the phase difference between the light u1 and u2 reaches a predetermined value, thus, through the optical branch The uplink radio frequency optical signal coupled out by the device can meet predetermined requirements, for example, the coupled uplink radio frequency optical signal becomes an SSB signal. In a specific implementation, the above-mentioned phase shift module may be implemented as a phase shifter.

该实施例中,关键元件是反射型半导体光放大器RSOA15和RSOA16。具体实现中,采用普通商用的RSOA即可,并无额外的参数值限定。重用下行波长,对上行数据进行移相等相关处理后分别经由两个RSOA调制,进而实现不同调制方式的上行光信号。In this embodiment, the key components are reflective semiconductor optical amplifiers RSOA15 and RSOA16. In a specific implementation, a common commercial RSOA can be used, and there is no additional parameter value limitation. The downlink wavelength is reused, and the uplink data is subjected to phase-shift correlation processing and then modulated by two RSOAs respectively, so as to realize uplink optical signals with different modulation modes.

如图3,该实施例中,光网络单元包括的电域处理模块包括:射频信号源11、第一相移模块12、第一乘法器13、第二乘法器14。电域处理模块将基带上行业务信号调制到射频载波上,输出携带上行信号数据的射频载波即射频上行业务信号作为输入RSOA的电调制信号。在后续处理中,以RSOA反射的下行信号作为上行信号的调制光源,实现了下行信号的重用,及在ONU不具备光发射模块时上行信号的反射,从而实现了ONU的波长自适应。该例中,电域处理模块的作用是将基带上行业务信号加载在具有预定相位差的射频载波信号上,形成可作为不同RSOA电调制信号的射频上行业务信号。As shown in FIG. 3 , in this embodiment, the electrical domain processing module included in the optical network unit includes: a radio frequency signal source 11 , a first phase shift module 12 , a first multiplier 13 , and a second multiplier 14 . The electrical domain processing module modulates the baseband uplink service signal onto the radio frequency carrier, and outputs the radio frequency carrier carrying the uplink signal data, that is, the radio frequency uplink service signal as the electrical modulation signal input to the RSOA. In the subsequent processing, the downstream signal reflected by RSOA is used as the modulation light source of the upstream signal to realize the reuse of the downstream signal and the reflection of the upstream signal when the ONU does not have an optical transmission module, thereby realizing the wavelength self-adaptation of the ONU. In this example, the function of the electrical domain processing module is to load the baseband uplink service signal on the radio frequency carrier signal with a predetermined phase difference to form a radio frequency uplink service signal that can be used as a different RSOA electrical modulation signal.

进一步地,通过调节上述第一相移模块和/或第二相移模块的相移值,可在实现ONU的波长自适应的同时,灵活地将上行信号调制为具有一定频移的射频单边带、双边带或抑制光载波信号。示例性地,当输入两个RSOA的两路电调制信号的相位差为90度时,光网络单元发送至光线路终端的上行射频光信号为对应调制在预定波长上的射频单边带信号,当光线路终端输出的下行信号为波长为λ0的基带信号,经RSOA-MI调制后输出至光线路终端的上行信号为具有一定频移的射频单边带信号;当两路电域信号的相位差为180度时,上行信号为对应调制在预定波长上的抑制光载波信号;当两路电域信号的相位差为0度时,上行信号为对应调制在预定波长的射频双边带信号。综上所述,在下行信号为基带信号时,本发明实施例的多波长无源光网络系统能在单纤上同时传输上下行信号,从而,在实现全双工的同时,可以抑制反向瑞利散射和光纤色散等有害因素,避免了反向瑞利散射和光纤色散的影响,从而可以在较低成本下,实现单纤双向高质量的高速信号传输。Further, by adjusting the phase shift value of the above-mentioned first phase shift module and/or the second phase shift module, the uplink signal can be flexibly modulated into a radio frequency unilateral with a certain frequency shift while realizing the wavelength self-adaptation of the ONU. band, double sideband or suppressed optical carrier signals. Exemplarily, when the phase difference between the two electrical modulation signals input to the two RSOAs is 90 degrees, the uplink radio frequency optical signal sent by the optical network unit to the optical line terminal is a radio frequency single sideband signal modulated on a predetermined wavelength, When the downlink signal output by the optical line terminal is a baseband signal with a wavelength of λ0 , the uplink signal output to the optical line terminal after modulation by RSOA-MI is a radio frequency single sideband signal with a certain frequency shift; When the phase difference is 180 degrees, the uplink signal is a suppressed optical carrier signal correspondingly modulated on a predetermined wavelength; when the phase difference between the two electrical domain signals is 0 degree, the uplink signal is a radio frequency double sideband signal correspondingly modulated on a predetermined wavelength. In summary, when the downlink signal is a baseband signal, the multi-wavelength passive optical network system of the embodiment of the present invention can simultaneously transmit uplink and downlink signals on a single fiber, so that while realizing full duplex, reverse Harmful factors such as Rayleigh scattering and fiber dispersion avoid the influence of reverse Rayleigh scattering and fiber dispersion, so that single-fiber bidirectional high-speed signal transmission with high quality can be realized at a lower cost.

图5为本发明又一实施例的多波长无源光网络系统的结构示意图。该实施例中,光网络单元的上行业务信号直接是来自无线业务接入点AP的射频上行业务信号,将射频上行业务数据分成两路并加上适当的相位差后作为RSOA的电调制信号。如图5,该实施例的电域处理模块包括:第三相移模块19,用于对分成两路传输的上行射频信号进行相位调节,以获得具有预定相位差的用于输入RSOA作为电调制信号的两路射频上行信号,第三路和第四路射频上行信号。FIG. 5 is a schematic structural diagram of a multi-wavelength passive optical network system according to another embodiment of the present invention. In this embodiment, the uplink service signal of the optical network unit is directly the radio frequency uplink service signal from the wireless service access point AP, and the radio frequency uplink service data is divided into two paths and added with an appropriate phase difference as an electrical modulation signal of the RSOA. As shown in Figure 5, the electrical domain processing module of this embodiment includes: a third phase shift module 19, which is used to adjust the phase of the uplink radio frequency signal divided into two transmissions, so as to obtain an input RSOA with a predetermined phase difference as an electrical modulation There are two radio frequency uplink signals of the signal, and the third and fourth radio frequency uplink signals.

图6为本发明图4所示的实施例中,当输入RSOA的电域信号的相位差为90度、光源波长为1490纳米时,射频5GHz的上行信号经RSOA-MI结构输出的光谱图。由如图6可知,经RSOA-MI结构输出的射频5GHz的上行射频光信号为在调制在1490纳米波长上的射频单边带信号。Fig. 6 is the spectrum diagram of the output signal of the 5 GHz radio frequency uplink signal through the RSOA-MI structure when the phase difference of the electrical domain signal input to the RSOA is 90 degrees and the wavelength of the light source is 1490 nanometers in the embodiment shown in Fig. 4 of the present invention. It can be seen from FIG. 6 that the uplink radio frequency optical signal of 5 GHz output through the RSOA-MI structure is a radio frequency single sideband signal modulated at a wavelength of 1490 nanometers.

图7为本发明图4所示的实施例中,当输入RSOA的电域信号的相位差为90度、光源波长为1550纳米时,射频32GHz的上行信号经RSOA-MI结构输出的光谱图。由如图7可知,经RSOA-MI结构输出的射频32GHz的上行射频光信号为在调制在1550纳米波长上的射频单边带信号。Fig. 7 is the spectrum diagram of the output signal of the 32 GHz radio frequency uplink signal through the RSOA-MI structure when the phase difference of the electrical domain signal input to the RSOA is 90 degrees and the wavelength of the light source is 1550 nanometers in the embodiment shown in Fig. 4 of the present invention. It can be seen from Fig. 7 that the uplink radio frequency optical signal of radio frequency 32 GHz output through the RSOA-MI structure is a radio frequency single sideband signal modulated at a wavelength of 1550 nanometers.

图3、图4所示实施例示出了光线路终端侧仅有一个发送单元,且只对应一个光网络单元的情况。在具体实现中,一个光线路终端中可以对应多个光网络单元。因此,可以在光线路终端中可设置多个光发送模块,并增加波分复用合波器、分波器实现光网络。图8为本发明实施例中,光线路终端多个无源光网络PON模块级联的结构示意图。CO(central office)表示中央局端。The embodiments shown in Fig. 3 and Fig. 4 show the situation that there is only one sending unit on the optical line terminal side and only corresponds to one optical network unit. In a specific implementation, one optical line terminal may correspond to multiple optical network units. Therefore, a plurality of optical transmission modules can be arranged in the optical line terminal, and a wavelength division multiplexing multiplexer and a demultiplexer are added to realize an optical network. Fig. 8 is a schematic structural diagram of cascading multiple passive optical network PON modules of an optical line terminal in an embodiment of the present invention. CO (central office) means the central office.

本发明实施例还公开了一种多波长无源光网络系统实现波长重用的方法。如图9,本发明实施例的多波长无源光网络系统实现波长重用的方法包括:The embodiment of the invention also discloses a method for realizing wavelength reuse in a multi-wavelength passive optical network system. As shown in Figure 9, the method for implementing wavelength reuse in the multi-wavelength passive optical network system of the embodiment of the present invention includes:

步骤901,光网络单元将光线路终端发送的预定波长的下行信号分成第一路和第二路;Step 901, the optical network unit divides the downlink signal of a predetermined wavelength sent by the optical line terminal into a first path and a second path;

该步骤中,具体实现中,光线路终端发送的多波长信号通过波分复用模块如AWG按照波长分解为多个单波长下行信号,该多个单波长下行信号分别对应于不同的光网络单元;In this step, in specific implementation, the multi-wavelength signal sent by the optical line terminal is decomposed into multiple single-wavelength downlink signals according to the wavelength through a wavelength division multiplexing module such as AWG, and the multiple single-wavelength downlink signals correspond to different optical network units. ;

步骤902,光网络单元接收所述第一路下行信号,并将所述第二路下行信号作为用于调制射频上行业务信号的调制光源,在对所述射频上行业务信号进行调制后,获得上行射频光信号,并将所述上行射频光信号发送至所述光线路终端。Step 902, the optical network unit receives the first downlink signal, uses the second downlink signal as a modulation light source for modulating the radio frequency uplink service signal, and obtains the uplink signal after modulating the radio frequency uplink service signal. radio frequency optical signal, and send the uplink radio frequency optical signal to the optical line terminal.

优选地,所述的方法,其中,所述步骤B包括:Preferably, said method, wherein said step B comprises:

步骤B1,获得两路具有预定相位差、且携带上行业务信号数据的同频射频上行业务信号:第三路射频上行业务信号和第四路射频上行业务信号;Step B1, obtaining two same-frequency radio frequency uplink service signals with a predetermined phase difference and carrying uplink service signal data: a third radio frequency uplink service signal and a fourth radio frequency uplink service signal;

步骤B2,将所述第二路下行信号分成第五路和第六路,并将所述第五路和第六路下行信号分别作为所述第三路和第四路射频上行业务信号的调制光源,分别对所述第三路和第四路射频上行业务信号进行调制,获得两路调制得到的、具有预定相位差的上行射频光信号,将所述具有预定相位差的两路调制后的上行射频光信号耦合后,并将耦合得到的上行射频光信号发送至所述光线路终端。Step B2, dividing the second downlink signal into fifth and sixth downlink signals, and using the fifth and sixth downlink signals as the modulation of the third and fourth radio frequency uplink service signals respectively a light source, respectively modulating the third and fourth radio frequency uplink service signals to obtain two modulated uplink radio frequency optical signals with a predetermined phase difference; After the uplink radio frequency optical signal is coupled, the coupled uplink radio frequency optical signal is sent to the optical line terminal.

优选地,所述的方法,其中,当所述光网络单元的上行业务信号为基带上行业务信号时,所述步骤B1包括:Preferably, the method, wherein, when the uplink service signal of the optical network unit is a baseband uplink service signal, the step B1 includes:

利用射频信号源产生两路同频同相的射频载波信号;Use the RF signal source to generate two RF carrier signals with the same frequency and phase;

利用第一相移模块对所述两路射频载波信号的相位差进行调节,获得具有预定相位差的第一射频载波信号和第二射频载波信号;Using the first phase shift module to adjust the phase difference of the two radio frequency carrier signals to obtain a first radio frequency carrier signal and a second radio frequency carrier signal with a predetermined phase difference;

将光网络单元发送的所述基带上行业务信号分成两路,将所述两路基带上行业务信号分别调制到所述第一射频载波信号和第二射频载波信号上,获得携带所述基带上行业务信号数据的所述第三射频上行业务信号和第四射频上行业务信号。Divide the baseband uplink service signal sent by the optical network unit into two paths, modulate the two paths of baseband uplink service signal onto the first radio frequency carrier signal and the second radio frequency carrier signal respectively, and obtain the baseband uplink service carrying the The third radio frequency uplink service signal and the fourth radio frequency uplink service signal of signal data.

优选地,所述的方法,其中,当所述光网络单元的上行业务信号为射频上行业务信号时,所述步骤B1包括:Preferably, the method, wherein, when the uplink service signal of the optical network unit is a radio frequency uplink service signal, the step B1 includes:

将所述射频上行业务信号分成两路;dividing the radio frequency uplink service signal into two paths;

利用第三相移模块对所述两路射频上行业务信号的相位差进行调节,获得具有预定相位差的所述第三路射频上行业务信号和第四路射频上行业务信号。Using the third phase shift module to adjust the phase difference of the two radio frequency uplink service signals to obtain the third radio frequency uplink service signal and the fourth radio frequency uplink service signal with a predetermined phase difference.

优选地,所述的方法,其中,所述光网络单元通过上行信号调制模块来实现上述步骤B,所述上行信号调制模块包括:Preferably, the method, wherein the optical network unit implements the above step B through an uplink signal modulation module, and the uplink signal modulation module includes:

第二光分支模块,包括第三分支和第四分支,用于将所述第二路下行信号分成第五路和第六路,所述第五路信号通过所述第三分支传输,所述第六路信号通过所述第四分支传输;The second optical branching module includes a third branch and a fourth branch, configured to divide the second downlink signal into a fifth path and a sixth path, the fifth path signal is transmitted through the third branch, and the The sixth signal is transmitted through the fourth branch;

第一反射型半导体光放大器,与所述第二光分支模块的第三分支相连接,用于以所述第五路的下行信号作为调制光源对所述第三路射频上行业务信号进行调制,并输出调制得到的第一上行射频光信号;The first reflective semiconductor optical amplifier is connected to the third branch of the second optical branch module, and is used to modulate the third radio frequency uplink service signal by using the fifth downlink signal as a modulation light source, and output the modulated first uplink radio frequency optical signal;

第二反射型半导体光放大器,与所述第二光分支模块的第四分支相连接,用于以所述第六路的下行信号作为调制光源对所述第四路射频上行业务信号进行调制,并输出调制得到的第二上行射频光信号;The second reflective semiconductor optical amplifier is connected to the fourth branch of the second optical branch module, and is used to modulate the fourth radio frequency uplink service signal by using the sixth downlink signal as a modulation light source, and output the modulated second uplink radio frequency optical signal;

所述第二光分支模块,进一步用于将所述第一上行射频光信号和第二上行射频光信号进行耦合,并将耦合得到的上行射频光信号发送至所述光线路终端。The second optical branching module is further configured to couple the first uplink radio frequency optical signal and the second uplink radio frequency optical signal, and send the coupled uplink radio frequency optical signal to the optical line terminal.

结合上述本发明实施例的多波长无源光网络系统,本发明一实施例的实现波长重用的方法包括:In combination with the multi-wavelength passive optical network system of the above-mentioned embodiments of the present invention, the method for realizing wavelength reuse in an embodiment of the present invention includes:

多路下行信号在OLT的多波长光源处进行直接的强度调制,多波长的已调信号形成多波长下行信号;The multi-channel downlink signal is directly modulated at the multi-wavelength light source of the OLT, and the multi-wavelength modulated signal forms a multi-wavelength downlink signal;

上述多波长下行信号经主干光纤、波分复用器、分支光纤传输至ONU处,由光分支器3分成两束,一束作为下行信号被接收模块解调和恢复,另一束进入ONU的上行信号的调制部分,即RSOA-MI;The above multi-wavelength downlink signal is transmitted to the ONU through the trunk fiber, wavelength division multiplexer, and branch fiber, and is divided into two bundles by the optical splitter 3. One bundle is demodulated and restored by the receiving module as a downlink signal, and the other bundle enters the ONU. The modulation part of the uplink signal, namely RSOA-MI;

所述ONU的上行信号的调制部分利用光分支器将光信号分为均匀的两路,分别进入上下臂的RSOA中,RSOA因具有增益快速饱和及缓慢恢复特性而对输入的光信号具有幅度钳制作用,被RSOA反射后的光信号幅度变化不大进而用作上行信号的调制光源;The modulation part of the upstream signal of the ONU uses an optical splitter to divide the optical signal into two even paths, and enters the RSOA of the upper and lower arms respectively. The RSOA has amplitude clamping on the input optical signal due to its fast gain saturation and slow recovery characteristics. Function, the amplitude of the optical signal reflected by the RSOA does not change much and is used as a modulated light source for the uplink signal;

ONU电域处理模块中,将上行数据调制到两路同频的正交的射频载波上,将所得的两路射频信号作为两个RSOA的电调制信号,对此时作为光源的下行信号进行调制。调节两路射频载波信号的相位差可以使耦合后所得的上行射频光信号实现SSB或OCS的特殊调制格式。In the ONU electrical domain processing module, the uplink data is modulated onto two orthogonal radio frequency carriers of the same frequency, and the obtained two radio frequency signals are used as the electrical modulation signals of two RSOAs, and the downlink signal used as the light source at this time is modulated . Adjusting the phase difference of two radio frequency carrier signals can make the uplink radio frequency optical signal obtained after coupling realize the special modulation format of SSB or OCS.

该实施例的方法中,所述WDM-PON的下行多波长基带信号,每一路采用直接强度调制;上行信号为多波长的副载波信号,每一路信号是调制在某波长的副载波上的SSB或OCS信号;因此上下行信号可在单纤上同时传输,而不会受到反向瑞利散射的影响。这里对副载波进行一下解释:光线路终端里有光源,光源提供多波长的光载波。而射频上行信号即由射频载波调制以后形成的信号,经RSOA调制到了光信号上,此时射频光信号里,原来意义上的射频载波便成为了副载波。In the method of this embodiment, the downlink multi-wavelength baseband signal of the WDM-PON adopts direct intensity modulation for each channel; the uplink signal is a multi-wavelength subcarrier signal, and each channel signal is SSB modulated on a subcarrier of a certain wavelength Or OCS signal; therefore, the uplink and downlink signals can be transmitted simultaneously on a single fiber without being affected by back Rayleigh scattering. Here is an explanation of the subcarrier: there is a light source in the optical line terminal, and the light source provides multi-wavelength optical carriers. The radio frequency uplink signal is the signal formed by modulating the radio frequency carrier, which is modulated onto the optical signal by RSOA. At this time, in the radio frequency optical signal, the original radio frequency carrier becomes the subcarrier.

电域处理模块输入两路RSOA中的电域信号同频,仅存在特殊的相差。这样,两RSOA反射调制后的光信号经光分支器18耦合后,可以产生较理想的特殊调制效果。例如,输入RSOA的两路电域信号,相差为90°时,两RSOA输出的重调制光信号耦合后,可实现光单边带SSB调制。输入RSOA的两路电域信号,相差为180°时,两RSOA输出的重调制光信号耦合后,可实现光抑制载波OCS调制。The electric field processing module inputs the electric field signals in the two RSOAs with the same frequency, and there is only a special phase difference. In this way, after the optical signals modulated by the reflection of the two RSOAs are coupled by the optical splitter 18, a relatively ideal special modulation effect can be produced. For example, when the two electrical domain signals input to the RSOA have a phase difference of 90°, after the remodulated optical signals output by the two RSOAs are coupled, optical single sideband SSB modulation can be realized. When the two electrical domain signals input to the RSOA have a phase difference of 180°, the optically suppressed carrier OCS modulation can be realized after the remodulated optical signals output by the two RSOAs are coupled.

与现有技术相比,本发明一个的技术方案具有以下优点:Compared with the prior art, a technical solution of the present invention has the following advantages:

通过重用了OLT传输的下行信号光,将这些下行光信号用作上行信号的调制光源,可实现在ONU中无需为上行信号配置专门的光源,从而WDM-PON中所有ONU的配置是统一的,便于大规模生产和大规模采购,进而降低成本。By reusing the downlink signal light transmitted by the OLT, these downlink optical signals are used as the modulation light source for the uplink signal, so that there is no need to configure a special light source for the uplink signal in the ONU, so that the configuration of all ONUs in the WDM-PON is unified. It is convenient for large-scale production and large-scale procurement, thereby reducing costs.

进一步地,本发明实施例的技术方案中,上下行光信号共用同一波长的光载波,下行为基带信号,上行为偏移了一定频率的射频信号,既节约波长资源,又克服了传统的单纤单波长双向WDM-PON中受反向瑞利散射影响严重的缺点;Further, in the technical solution of the embodiment of the present invention, the uplink and downlink optical signals share an optical carrier of the same wavelength, the downlink is a baseband signal, and the uplink is a radio frequency signal shifted by a certain frequency, which not only saves wavelength resources, but also overcomes the traditional single The disadvantage of being seriously affected by reverse Rayleigh scattering in fiber single-wavelength bidirectional WDM-PON;

进一步地,本发明实施例的技术方案中,ONU不需配置特殊波长的上行光源,ONU具有波长无关性,即对波长的自适应性,便于OLT从全网的角度统一分配和调度波长资源;Further, in the technical solution of the embodiment of the present invention, the ONU does not need to configure an uplink light source with a special wavelength, and the ONU has wavelength independence, that is, adaptability to wavelength, which facilitates the unified allocation and scheduling of wavelength resources by the OLT from the perspective of the entire network;

进一步地,本发明实施例的技术方案可在实现ONU的波长自适应能力的同时,可灵活地实现具有SSB或OCS等特殊调制格式的上行信号,这种灵活的调制方式在利于减小色散对射频光信号的影响;Further, the technical solutions of the embodiments of the present invention can flexibly implement uplink signals with special modulation formats such as SSB or OCS while realizing the wavelength self-adaptive capability of the ONU. The influence of radio frequency optical signal;

进一步地,本发明实施例的ONU在分光和调制等环节,无源光器件都采用波导型器件,有源光器件为结构紧凑的RSOA器件,整体结构体积小、易集成、功耗低;Further, in the ONU of the embodiment of the present invention, the passive optical device adopts a waveguide type device in links such as light splitting and modulation, and the active optical device is a compact RSOA device, and the overall structure is small in size, easy to integrate, and low in power consumption;

进一步地,本发明实施例的技术方案适用上下行信号速率对称与非对称的两种情况,在低功率条件下,重用下行波长,进行高速率、高性能的传输;Further, the technical solutions of the embodiments of the present invention are applicable to two cases of symmetric and asymmetric uplink and downlink signal rates, and under low power conditions, downlink wavelengths are reused for high-speed, high-performance transmission;

进一步地,本发明实施例的技术方案适用于几个GHz-几十GHz多种调制格式的射频信号,较低功率下在接入网距离内高效地传输。Furthermore, the technical solutions of the embodiments of the present invention are applicable to radio frequency signals of multiple modulation formats ranging from several GHz to tens of GHz, and can be efficiently transmitted within the distance of the access network at relatively low power.

以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以作出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (18)

1.一种多波长无源光网络系统,包括:光线路终端、波分复用模块、和一个或多个光网络单元,其特征在于,1. A multi-wavelength passive optical network system, comprising: an optical line terminal, a wavelength division multiplexing module, and one or more optical network units, characterized in that, 所述光线路终端,用于发送多波长下行信号,及接收所述光网络单元发送的上行射频光信号;The optical line terminal is used to send multi-wavelength downlink signals and receive uplink radio frequency optical signals sent by the optical network unit; 所述波分复用模块,与所述光线路终端和所述各光网络单元相连接,用于将所述光线路终端发送的所述多波长下行信号分解为对应于各个光网络单元的各个单波长下行信号,发送至对应光网络单元,并将来自各个光网络单元的单波长上行射频光信号合波后,发送至所述光线路终端;The wavelength division multiplexing module is connected to the optical line terminal and the optical network units, and is used to decompose the multi-wavelength downlink signal sent by the optical line terminal into individual signals corresponding to each optical network unit. The single-wavelength downlink signal is sent to the corresponding optical network unit, and the single-wavelength uplink radio frequency optical signal from each optical network unit is combined and sent to the optical line terminal; 所述光网络单元中的每一个包括:Each of the optical network units includes: 第一光分支模块,用于将所述光线路终端发送的多波长下行信号中、预定波长的下行信号分成第一路和第二路;A first optical branching module, configured to divide the downlink signal of a predetermined wavelength among the multi-wavelength downlink signals sent by the optical line terminal into a first path and a second path; 下行信号接收模块,用于接收所述第一路下行信号;a downlink signal receiving module, configured to receive the first downlink signal; 上行信号调制模块,用于将所述第二路下行信号作为所述上行信号调制模块所属光网络单元的射频上行业务信号的调制光源,对所述射频上行业务信号进行调制,并将调制得到的上行射频光信号通过所述第一光分支模块发送至所述波分复用模块,由所述波分复用模块发送至所述光线路终端;An uplink signal modulation module, configured to use the second downlink signal as a modulation light source for the radio frequency uplink service signal of the optical network unit to which the uplink signal modulation module belongs, modulate the radio frequency uplink service signal, and modulate the obtained The uplink radio frequency optical signal is sent to the wavelength division multiplexing module through the first optical branch module, and sent to the optical line terminal by the wavelength division multiplexing module; 所述每一个光网络单元还包括:Each optical network unit also includes: 电域处理模块,用于获得两路具有预定相位差、且携带上行业务数据的同频射频上行业务信号:第三路射频上行业务信号和第四路射频上行业务信号;An electrical domain processing module, configured to obtain two same-frequency radio frequency uplink service signals with a predetermined phase difference and carrying uplink service data: a third radio frequency uplink service signal and a fourth radio frequency uplink service signal; 所述上行信号调制模块,进一步用于将所述第二路的下行信号分成第五路和第六路,将所述第五路和第六路的下行信号分别作为所述第三路和第四路射频上行业务信号的调制光源,分别对所述第三路和第四路射频上行业务信号进行调制,调制后获得两路具有预定相位差的上行射频光信号,将所述两路调制得到的上行射频光信号耦合,并将耦合得到的上行射频光信号发送至所述光线路终端。The uplink signal modulation module is further configured to divide the downlink signal of the second path into a fifth path and a sixth path, and use the downlink signal of the fifth path and the sixth path as the third path and the sixth path respectively. Modulating light sources for four radio frequency uplink service signals respectively modulate the third and fourth radio frequency uplink service signals, obtain two uplink radio frequency optical signals with a predetermined phase difference after modulation, and modulate the two channels to obtain The uplink radio frequency optical signal is coupled, and the coupled uplink radio frequency optical signal is sent to the optical line terminal. 2.根据权利要求1所述的多波长无源光网络系统,其特征在于,所述上行信号调制模块包括:2. The multi-wavelength passive optical network system according to claim 1, wherein the uplink signal modulation module comprises: 第二光分支模块,包括第三分支和第四分支,用于在下行方向将所述第二路下行信号分成均匀的第五路和第六路,所述第五路信号通过所述第三分支传输,所述第六路信号通过所述第四分支传输;The second optical branching module, including a third branch and a fourth branch, is used to divide the second downlink signal into uniform fifth and sixth paths in the downlink direction, and the fifth path signal passes through the third Branch transmission, the sixth signal is transmitted through the fourth branch; 第一反射型半导体光放大器,与所述第二光分支模块的第三分支及所述电域处理模块相连接,用于以所述第五路的下行信号作为调制光源对所述第三路射频上行业务信号进行调制,并输出调制得到的第一上行射频光信号;The first reflective semiconductor optical amplifier is connected to the third branch of the second optical branching module and the electrical domain processing module, and is used to use the downlink signal of the fifth path as a modulated light source for the third path Modulating the radio frequency uplink service signal, and outputting the modulated first uplink radio frequency optical signal; 第二反射型半导体光放大器,与所述第二光分支模块的第四分支及所述电域处理模块相连接,用于以所述第六路的下行信号作为调制光源对所述第四路射频上行业务信号进行调制,并输出调制得到的第二上行射频光信号;The second reflective semiconductor optical amplifier is connected to the fourth branch of the second optical branching module and the electrical domain processing module, and is used to use the downlink signal of the sixth path as a modulation light source to the fourth path Modulating the radio frequency uplink service signal, and outputting the modulated second uplink radio frequency optical signal; 所述第二光分支模块,进一步用于将所述第一上行射频光信号和第二上行射频光信号进行耦合,并将耦合得到的上行射频光信号通过所述第一光分支模块发送至所述光线路终端。The second optical branching module is further configured to couple the first uplink radio frequency optical signal and the second uplink radio frequency optical signal, and send the coupled uplink radio frequency optical signal to the Described optical line terminal. 3.根据权利要求2所述的多波长无源光网络系统,其特征在于,所述上行信号调制模块为:辅以反射型半导体光放大器的波导型迈克尔逊干涉仪,所述第一、第二反射型半导体光放大器分别位于所述波导型迈克尔逊干涉仪的上下两臂。3. The multi-wavelength passive optical network system according to claim 2, wherein the uplink signal modulation module is: a waveguide-type Michelson interferometer supplemented with a reflective semiconductor optical amplifier, and the first and second The two reflective semiconductor optical amplifiers are respectively located at the upper and lower arms of the waveguide Michelson interferometer. 4.根据权利要求2所述的多波长无源光网络系统,其特征在于,当所述光网络单元的上行业务信号为基带上行业务信号时,所述电域处理模块包括:4. The multi-wavelength passive optical network system according to claim 2, wherein when the uplink service signal of the optical network unit is a baseband uplink service signal, the electrical domain processing module includes: 射频信号源,用于产生两路同频同相的射频载波信号;The radio frequency signal source is used to generate two radio frequency carrier signals of the same frequency and phase; 第一相移模块,与所述射频信号源相连接,用于对所述两路射频载波信号的相位差进行调节,获得具有预定相位差的第一射频载波信号和第二射频载波信号;The first phase shift module is connected to the radio frequency signal source and is used to adjust the phase difference of the two radio frequency carrier signals to obtain a first radio frequency carrier signal and a second radio frequency carrier signal with a predetermined phase difference; 调制模块,用于将所述基带上行业务信号分成两路,并将所述两路基带上行业务信号分别调制到所述第一射频载波信号和第二射频载波信号上,获得携带所述基带上行业务信号数据的所述第三路射频上行业务信号和第四路射频上行业务信号。a modulation module, configured to divide the baseband uplink service signal into two paths, and modulate the two paths of baseband uplink service signal onto the first radio frequency carrier signal and the second radio frequency carrier signal respectively, so as to obtain the baseband uplink service signal carrying the baseband The third radio frequency uplink service signal and the fourth radio frequency uplink service signal of service signal data. 5.根据权利要求1所述的多波长无源光网络系统,其特征在于,所述第三路射频上行业务信号和第四路射频上行业务信号的相位差为:0度、90度或180度。5. The multi-wavelength passive optical network system according to claim 1, wherein the phase difference between the third radio frequency uplink service signal and the fourth radio frequency uplink service signal is: 0 degrees, 90 degrees or 180 degrees Spend. 6.根据权利要求4所述的多波长无源光网络系统,其特征在于,所述上行信号调制模块还包括:6. The multi-wavelength passive optical network system according to claim 4, wherein the uplink signal modulation module further comprises: 第二相移模块,设置在所述第二光分支模块的第三分支或第四分支上,用于将所述第一上行射频光信号和第二上行射频光信号的相位差调节到预定值。The second phase shift module is arranged on the third branch or the fourth branch of the second optical branching module, and is used to adjust the phase difference between the first uplink radio frequency optical signal and the second uplink radio frequency optical signal to a predetermined value . 7.根据权利要求2所述的多波长无源光网络系统,其特征在于,当所述光网络单元的上行业务信号为射频上行业务信号时,所述电域处理模块包括:7. The multi-wavelength passive optical network system according to claim 2, wherein when the uplink service signal of the optical network unit is a radio frequency uplink service signal, the electrical domain processing module includes: 第三相移模块,用于对分成两路传输的射频上行业务信号进行相位调节,以获得具有预定相位差的所述第三路射频上行业务信号和第四路射频上行业务信号。The third phase shifting module is configured to adjust the phase of the radio frequency uplink service signal divided into two channels to obtain the third radio frequency uplink service signal and the fourth radio frequency uplink service signal with a predetermined phase difference. 8.根据权利要求1所述的多波长无源光网络系统,其特征在于,所述光网络单元中的每一个还包括:8. The multi-wavelength passive optical network system according to claim 1, wherein each of the optical network units further comprises: 光信号隔离器,与所述第一光分支模块和所述下行信号接收模块相连接,用于直通所述第一路下行信号至所述下行信号接收模块,及阻止所述下行信号接收模块反射回来的光信号。An optical signal isolator, connected to the first optical branch module and the downlink signal receiving module, is used to directly pass the first downlink signal to the downlink signal receiving module, and prevent the downlink signal receiving module from reflecting back light signal. 9.根据权利要求1所述的多波长无源光网络系统,其特征在于,所述光线路终端发送的多波长下行信号为:对多路单波长下行信号进行直接强度调制后形成的多波长下行信号。9. The multi-wavelength passive optical network system according to claim 1, wherein the multi-wavelength downlink signal sent by the optical line terminal is: a multi-wavelength downlink signal formed after direct intensity modulation of multiple single-wavelength downlink signals downlink signal. 10.一种多波长无源光网络系统实现波长重用的方法,其特征在于,包括:10. A method for realizing wavelength reuse in a multi-wavelength passive optical network system, comprising: 步骤A,光网络单元将光线路终端发送的预定波长的下行信号分成第一路和第二路;Step A, the optical network unit divides the downlink signal of a predetermined wavelength sent by the optical line terminal into a first path and a second path; 步骤B,光网络单元接收所述第一路下行信号,并将所述第二路下行信号作为用于调制射频上行业务信号的调制光源,在对所述射频上行业务信号调制后,获得上行射频光信号,并将所述上行射频光信号发送至所述光线路终端;Step B, the optical network unit receives the first downlink signal, and uses the second downlink signal as a modulation light source for modulating the radio frequency uplink service signal, and obtains the uplink radio frequency after modulating the radio frequency uplink service signal an optical signal, and send the uplink radio frequency optical signal to the optical line terminal; 所述步骤B包括:Described step B comprises: 步骤B1,获得两路具有预定相位差、且携带上行业务信号数据的同频射频上行业务信号:第三路射频上行业务信号和第四路射频上行业务信号;Step B1, obtaining two same-frequency radio frequency uplink service signals with a predetermined phase difference and carrying uplink service signal data: a third radio frequency uplink service signal and a fourth radio frequency uplink service signal; 步骤B2,将所述第二路下行信号分成第五路和第六路,并将所述第五路和第六路下行信号分别作为所述第三路和第四路射频上行业务信号的调制光源,分别对所述第三路和第四路射频上行业务信号进行调制,调制后获得的两路具有预定相位差的上行射频光信号,将所述具有预定相位差的两路调制后的上行射频光信号耦合,并将耦合得到的上行射频光信号发送至所述光线路终端。Step B2, dividing the second downlink signal into fifth and sixth downlink signals, and using the fifth and sixth downlink signals as the modulation of the third and fourth radio frequency uplink service signals respectively The light source modulates the third and fourth radio frequency uplink service signals respectively, obtains two uplink radio frequency optical signals with a predetermined phase difference after modulation, and converts the two modulated uplink radio signals with a predetermined phase difference The radio frequency optical signal is coupled, and the coupled uplink radio frequency optical signal is sent to the optical line terminal. 11.根据权利要求10所述的方法,其特征在于,当所述光网络单元的上行业务信号为基带上行业务信号时,所述步骤B1包括:11. The method according to claim 10, wherein when the uplink service signal of the optical network unit is a baseband uplink service signal, the step B1 comprises: 利用射频信号源产生两路同频同相的射频载波信号;Use the RF signal source to generate two RF carrier signals with the same frequency and phase; 利用第一相移模块对所述两路射频载波信号的相位差进行调节,获得具有预定相位差的第一射频载波信号和第二射频载波信号;Using the first phase shift module to adjust the phase difference of the two radio frequency carrier signals to obtain a first radio frequency carrier signal and a second radio frequency carrier signal with a predetermined phase difference; 将光网络单元发送的所述基带上行业务信号分成两路,将所述两路基带上行业务信号分别调制到所述第一射频载波信号和第二射频载波信号上,获得携带所述基带上行业务信号数据的所述第三路射频上行业务信号和第四路射频上行业务信号。Divide the baseband uplink service signal sent by the optical network unit into two paths, modulate the two paths of baseband uplink service signal onto the first radio frequency carrier signal and the second radio frequency carrier signal respectively, and obtain the baseband uplink service carrying the The third radio frequency uplink service signal and the fourth radio frequency uplink service signal of the signal data. 12.根据权利要求10所述的方法,其特征在于,当所述光网络单元的上行业务信号为射频上行业务信号时,所述步骤B1包括:12. The method according to claim 10, wherein when the uplink service signal of the optical network unit is a radio frequency uplink service signal, the step B1 comprises: 将所述射频上行业务信号分成两路;dividing the radio frequency uplink service signal into two paths; 利用第三相移模块对所述两路射频上行业务信号的相位差进行调节,获得具有预定相位差的所述第三路射频上行业务信号和第四路射频上行业务信号。Using the third phase shift module to adjust the phase difference of the two radio frequency uplink service signals to obtain the third radio frequency uplink service signal and the fourth radio frequency uplink service signal with a predetermined phase difference. 13.根据权利要求10-12中任一项所述的方法,其特征在于,所述光网络单元通过上行信号调制模块来实现上述步骤B,所述上行信号调制模块包括:13. The method according to any one of claims 10-12, wherein the optical network unit implements the above step B through an uplink signal modulation module, and the uplink signal modulation module includes: 第二光分支模块,包括第三分支和第四分支,用于将所述第二路下行信号分成第五路和第六路,所述第五路信号通过所述第三分支传输,所述第六路信号通过所述第四分支传输;The second optical branching module includes a third branch and a fourth branch, configured to divide the second downlink signal into a fifth path and a sixth path, the fifth path signal is transmitted through the third branch, and the The sixth signal is transmitted through the fourth branch; 第一反射型半导体光放大器,与所述第二光分支模块的第三分支相连接,用于以所述第五路的下行信号作为调制光源对所述第三路射频上行业务信号进行调制,并输出调制得到的第一上行射频光信号;The first reflective semiconductor optical amplifier is connected to the third branch of the second optical branch module, and is used to modulate the third radio frequency uplink service signal by using the fifth downlink signal as a modulation light source, and output the modulated first uplink radio frequency optical signal; 第二反射型半导体光放大器,与所述第二光分支模块的第四分支相连接,用于以所述第六路的下行信号作为调制光源对所述第四路射频上行业务信号进行调制,并输出调制得到的第二上行射频光信号;The second reflective semiconductor optical amplifier is connected to the fourth branch of the second optical branch module, and is used to modulate the fourth radio frequency uplink service signal by using the sixth downlink signal as a modulation light source, and output the modulated second uplink radio frequency optical signal; 所述第二光分支模块,进一步用于将所述第一上行射频光信号和第二上行射频光信号进行耦合,并将耦合得到的上行射频光信号发送至所述光线路终端。The second optical branching module is further configured to couple the first uplink radio frequency optical signal and the second uplink radio frequency optical signal, and send the coupled uplink radio frequency optical signal to the optical line terminal. 14.一种光网络单元,其特征在于,包括:14. An optical network unit, comprising: 第一光分支模块,用于将光线路终端发送的多波长下行信号中、预定波长的下行信号分成第一路和第二路;The first optical branching module is configured to divide the downlink signal of a predetermined wavelength among the multi-wavelength downlink signals sent by the optical line terminal into a first path and a second path; 下行信号接收模块,用于接收所述第一路下行信号;a downlink signal receiving module, configured to receive the first downlink signal; 上行信号调制模块,用于将所述第二路下行信号作为所述上行信号调制模块所属光网络单元的射频上行业务信号的调制光源,对所述射频上行业务信号进行调制,并将调制得到的上行射频光信号发送至所述光线路终端;An uplink signal modulation module, configured to use the second downlink signal as a modulation light source for the radio frequency uplink service signal of the optical network unit to which the uplink signal modulation module belongs, modulate the radio frequency uplink service signal, and modulate the obtained sending an uplink radio frequency optical signal to the optical line terminal; 电域处理模块,用于获得两路具有预定相位差、且携带上行业务数据的同频射频上行业务信号:第三路射频上行业务信号和第四路射频上行业务信号;An electrical domain processing module, configured to obtain two same-frequency radio frequency uplink service signals with a predetermined phase difference and carrying uplink service data: a third radio frequency uplink service signal and a fourth radio frequency uplink service signal; 所述上行信号调制模块,进一步用于将所述第二路的下行信号分成第五路和第六路,将所述第五路和第六路的下行信号分别作为所述第三路和第四路射频上行业务信号的调制光源,分别对所述第三路和第四路射频上行业务信号进行调制,获得具有预定相位差的两路调制后的上行射频光信号,将所述具有预定相位差的两路调制后的上行射频光信号耦合,并将耦合得到的上行射频光信号发送至所述光线路终端。The uplink signal modulation module is further configured to divide the downlink signal of the second path into a fifth path and a sixth path, and use the downlink signal of the fifth path and the sixth path as the third path and the sixth path respectively. Modulating light sources for four radio frequency uplink service signals respectively modulate the third and fourth radio frequency uplink service signals to obtain two modulated uplink radio frequency optical signals with a predetermined phase difference, and convert the modulated uplink radio frequency optical signals with a predetermined phase difference Coupling the modulated uplink radio frequency optical signals of the two channels, and sending the coupled uplink radio frequency optical signals to the optical line terminal. 15.根据权利要求14所述的光网络单元,其特征在于,所述上行信号调制模块包括:15. The optical network unit according to claim 14, wherein the uplink signal modulation module comprises: 第二光分支模块,包括第三分支和第四分支,用于在下行方向将所述第二路下行信号分成均匀的第五路和第六路,所述第五路信号通过所述第三分支传输,所述第六路信号通过所述第四分支传输;The second optical branching module, including a third branch and a fourth branch, is used to divide the second downlink signal into uniform fifth and sixth paths in the downlink direction, and the fifth path signal passes through the third Branch transmission, the sixth signal is transmitted through the fourth branch; 第一反射型半导体光放大器,与所述第二光分支模块的第三分支及所述电域处理模块相连接,用于以所述第五路的下行信号作为调制光源对所述第三路射频上行业务信号进行调制,并输出调制得到的第一上行射频光信号;The first reflective semiconductor optical amplifier is connected to the third branch of the second optical branching module and the electrical domain processing module, and is used to use the downlink signal of the fifth path as a modulated light source for the third path Modulating the radio frequency uplink service signal, and outputting the modulated first uplink radio frequency optical signal; 第二反射型半导体光放大器,与所述第二光分支模块的第四分支及所述电域处理模块相连接,用于以所述第六路的下行信号作为调制光源对所述第四路射频上行业务信号进行调制,并输出调制得到的第二上行射频光信号;The second reflective semiconductor optical amplifier is connected to the fourth branch of the second optical branching module and the electrical domain processing module, and is used to use the downlink signal of the sixth path as a modulation light source to the fourth path Modulating the radio frequency uplink service signal, and outputting the modulated second uplink radio frequency optical signal; 所述第二光分支模块,进一步用于将所述第一上行射频光信号和第二上行射频光信号进行耦合,并将耦合得到的上行射频光信号通过所述第一光分支模块发送至所述光线路终端。The second optical branching module is further configured to couple the first uplink radio frequency optical signal and the second uplink radio frequency optical signal, and send the coupled uplink radio frequency optical signal to the Described optical line terminal. 16.根据权利要求15所述的光网络单元,其特征在于,所述上行信号调制模块为:辅以反射型半导体光放大器的波导型迈克尔逊干涉仪,所述第一、第二反射型半导体光放大器分别位于所述波导型迈克尔逊干涉仪的上下两臂。16. The optical network unit according to claim 15, wherein the uplink signal modulation module is: a waveguide Michelson interferometer supplemented with a reflective semiconductor optical amplifier, and the first and second reflective semiconductor The optical amplifiers are respectively located at the upper and lower arms of the waveguide Michelson interferometer. 17.根据权利要求15所述的光网络单元,其特征在于,当所述光网络单元的上行业务信号为基带上行业务信号时,所述电域处理模块包括:17. The optical network unit according to claim 15, wherein when the uplink service signal of the optical network unit is a baseband uplink service signal, the electrical domain processing module includes: 射频信号源,用于产生两路同频同相的射频载波信号;The radio frequency signal source is used to generate two radio frequency carrier signals of the same frequency and phase; 第一相移模块,与所述射频信号源相连接,用于对所述两路射频载波信号的相位差进行调节,获得具有预定相位差的第一射频载波信号和第二射频载波信号;The first phase shift module is connected to the radio frequency signal source and is used to adjust the phase difference of the two radio frequency carrier signals to obtain a first radio frequency carrier signal and a second radio frequency carrier signal with a predetermined phase difference; 调制模块,用于将所述基带上行业务信号分成两路,并将所述两路基带上行信号分别调制到所述第一射频载波信号和第二射频载波信号上,获得携带所述基带上行业务信号数据的所述第三路射频上行业务信号和第四路射频上行业务信号。A modulating module, configured to divide the baseband uplink service signal into two paths, and modulate the two paths of baseband uplink signal to the first radio frequency carrier signal and the second radio frequency carrier signal respectively, so as to obtain the baseband uplink service carrying The third radio frequency uplink service signal and the fourth radio frequency uplink service signal of the signal data. 18.根据权利要求14所述的光网络单元,其特征在于,所述第三路射频上行业务信号和第四路射频上行业务信号的相位差为:0度、90度或180度。18. The optical network unit according to claim 14, wherein the phase difference between the third radio frequency uplink service signal and the fourth radio frequency uplink service signal is: 0 degrees, 90 degrees or 180 degrees.
CN200910236737.2A 2009-10-29 2009-10-29 Multi-wavelength passive optical network system, wavelength reusing method and optical network unit Expired - Fee Related CN101702785B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200910236737.2A CN101702785B (en) 2009-10-29 2009-10-29 Multi-wavelength passive optical network system, wavelength reusing method and optical network unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200910236737.2A CN101702785B (en) 2009-10-29 2009-10-29 Multi-wavelength passive optical network system, wavelength reusing method and optical network unit

Publications (2)

Publication Number Publication Date
CN101702785A CN101702785A (en) 2010-05-05
CN101702785B true CN101702785B (en) 2013-01-23

Family

ID=42157672

Family Applications (1)

Application Number Title Priority Date Filing Date
CN200910236737.2A Expired - Fee Related CN101702785B (en) 2009-10-29 2009-10-29 Multi-wavelength passive optical network system, wavelength reusing method and optical network unit

Country Status (1)

Country Link
CN (1) CN101702785B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102136877A (en) * 2011-03-11 2011-07-27 北京邮电大学 Broadband access system and method based on 60GHz millimeter wave in high-speed rail
CN103248447A (en) * 2012-02-09 2013-08-14 北京邮电大学 Wavelength division multiplexing passive optical network system
CN103067089B (en) * 2012-12-20 2016-01-20 北京邮电大学 ROF and WDM-PON emerging system and method for transmitting signals thereof
RU2521045C1 (en) * 2012-12-27 2014-06-27 Сергей Николаевич Сергеев Method of setting up duplex links in one fibre using optical signals operating in opposite directions and having same carrier wavelength with retroreflection control
CN104066016B (en) * 2013-03-18 2017-10-13 北京邮电大学 A kind of colorless ONU upstream wavelength method to set up and system based on tunable laser
US10050713B2 (en) 2015-03-02 2018-08-14 Futurewei Technologies, Inc. Optical transceiver using duplex media, self-homodyne detection (SHD), coherent detection, and uncooled laser
CN112671468A (en) * 2015-08-20 2021-04-16 中兴通讯股份有限公司 OLT optical transceiver integrated module, method and system for processing multiple PONs
CN106712845B (en) * 2016-11-14 2019-04-30 浙江大学 RSOA-based high-speed amplifying inverse modulation reflection module and its realization method
CN115426010B (en) * 2022-08-05 2024-02-23 中国电信股份有限公司 5G MIMO signal transmission system and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1983906A (en) * 2005-12-22 2007-06-20 华为技术有限公司 Passive light network for wave duplexing and its realization
CN101399618A (en) * 2007-09-26 2009-04-01 华为技术有限公司 Optical line terminal, passive optical network and radio frequency signal transmission method
CN101420285A (en) * 2007-10-25 2009-04-29 华为技术有限公司 Optical line terminal, far-end node unit, method and system for reducing quantity of light source

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1983906A (en) * 2005-12-22 2007-06-20 华为技术有限公司 Passive light network for wave duplexing and its realization
CN101399618A (en) * 2007-09-26 2009-04-01 华为技术有限公司 Optical line terminal, passive optical network and radio frequency signal transmission method
CN101420285A (en) * 2007-10-25 2009-04-29 华为技术有限公司 Optical line terminal, far-end node unit, method and system for reducing quantity of light source

Also Published As

Publication number Publication date
CN101702785A (en) 2010-05-05

Similar Documents

Publication Publication Date Title
CN101702785B (en) Multi-wavelength passive optical network system, wavelength reusing method and optical network unit
US8705970B2 (en) Method for data processing in an optical network, optical network component and communication system
US8934773B2 (en) Method for data processing in an optical network, optical network component and communication system
US9608760B2 (en) Integrated access network
US8055133B2 (en) TDM/WDMA passive optical network device
CN102724012B (en) Light-source-shared WDM-PON (wavelength division multiplexed passive optical network) system based on suppressed carrier modulation technique
CN101399618A (en) Optical line terminal, passive optical network and radio frequency signal transmission method
CN101924963B (en) OFDMA (Orthogonal Frequency Division Multiplex Address)-based mixed passive optical network transmission system
WO2010093195A2 (en) Low-noise optical signal transmitter with low-noise multi-wavelength light source, broadcast signal transmitter using low-noise multi-wavelength light source, and optical network with the same
WO2007071154A1 (en) A wavelength division multiplexing passive optical network and its implement method
US20100021164A1 (en) Wdm pon rf/video broadcast overlay
CN103248427A (en) RoF-PON hybrid access system
US20120263474A1 (en) Method for Arbitrary Optical Microwave and MM-Wave Generation
TWI513207B (en) A remote node device, an optical network unit, a system and a communication method thereof
CN103747371B (en) A kind of time-division wavelength-division mixed multiplexing passive optical network system
US20070177873A1 (en) Hybrid passive optical network
CN104486028B (en) The system and method for wavelength-division multiplex soft exchange net low cost LAN service transmission
CN103475955B (en) Descending DPSK modulation and the mixing TWDM-PON system of up directly modulation
CN105450325A (en) Low-cost 40Gb/s symmetric TWDM-PON system
KR101150688B1 (en) Device and method for generating the millimeter-wave based radio over fiber system
KR20120074357A (en) Passive optical network apparatus for transmitting optical signal
Yu et al. A novel WDM-PON architecture with centralized lightwaves in the OLT for providing triple play services
JP3987447B2 (en) Optical carrier generator, optical modulator, optical signal transmitter / receiver, and optical communication system
US20250097612A1 (en) Optical frequency comb locking for a flexible passive optical network
CN104768087A (en) Method and device for generating multi-wavelength light waves, and central office transmission method and device

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130123

Termination date: 20211029