WO2017118153A1 - 基于啁啾光栅的长距离无源光网络系统及色散补偿方法 - Google Patents

基于啁啾光栅的长距离无源光网络系统及色散补偿方法 Download PDF

Info

Publication number
WO2017118153A1
WO2017118153A1 PCT/CN2016/102819 CN2016102819W WO2017118153A1 WO 2017118153 A1 WO2017118153 A1 WO 2017118153A1 CN 2016102819 W CN2016102819 W CN 2016102819W WO 2017118153 A1 WO2017118153 A1 WO 2017118153A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
grating
signal
olt
uplink signal
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.)
Ceased
Application number
PCT/CN2016/102819
Other languages
English (en)
French (fr)
Inventor
王素椅
义理林
李正璇
王晓东
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.)
Fiberhome Telecommunication Technologies Co Ltd
Original Assignee
Fiberhome Telecommunication Technologies Co Ltd
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 Fiberhome Telecommunication Technologies Co Ltd filed Critical Fiberhome Telecommunication Technologies Co Ltd
Publication of WO2017118153A1 publication Critical patent/WO2017118153A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
    • H04B10/25133—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion including a lumped electrical or optical dispersion compensator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
    • H04B10/2519—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using Bragg gratings

Definitions

  • the present invention relates to the field of optical communication technologies, and in particular to a long-distance passive optical network system based on chirped gratings and a dispersion compensation method.
  • the optical access network has the lower cost, especially in the optical network unit (ONU), which generally uses a relatively low-cost direct-adjusting laser; in addition, the number of central offices is reduced to facilitate management and Reduce the cost, so that the coverage of a single optical line terminal (OLT) is gradually increased; however, due to the simultaneous occurrence of the direct modulation laser and the abnormal dispersion of the optical fiber, the direct modulation signal rapidly deteriorates during transmission, so the dispersion compensation becomes long.
  • the current dispersion compensation schemes are mainly as follows:
  • N.Cheng et al. presented "10Gb/s Upstream Transmission in TWDM PON UsingDuobinary and PAM-4Modulations with Directly Modulated Tunable DBR Laser” at the Communications and Photonics Conference (ACP) in 2013 (in TWDM-PON)
  • a direct modulation laser is used to transmit a 10 Gbps signal using a dual binary and four-level pulse amplitude modulation format signal.
  • the scheme uses a dual binary and four-level pulse amplitude modulation format to transmit 10Gbps signals, and successfully realizes the transmission of 20km signals.
  • the disadvantage of this scheme is that the signal degradation is particularly severe when the signal is transmitted to 40 km.
  • the technical problem to be solved by the present invention is to realize a problem of high-power transmission of a high-speed uplink signal of 10 Gbps or more and a speed of 40 km or more using a simple and low-cost device.
  • the ⁇ -grating-based long-distance passive optical network system used in the present invention includes an OLT (Optical Line Terminal), an ODN (Optical Transmission Unit), and an ONU (Optical Network Unit);
  • the OLT is connected to the ONU network by using the ODN;
  • the OLT includes a downlink signal transmitting device, an uplink signal receiving device, a chirped grating, a first optical circulator, and an optical amplifier; and a pin of the first optical circulator Connected to the transmitting end of the uplink signal receiving device by the chirped grating, the pin of the first optical circulator is connected to the line signal At the transmitting end of the transmitting device, the 3 pin of the first optical circulator is connected to the ODN through the optical amplifier.
  • the ODN includes a beam splitter and a single film fiber connected to the beam splitter, a single film fiber is connected to the OLT, and the beam splitter is connected to the ONU;
  • the ONU includes a second optical circulator, a tunable optical filter, a downlink signal receiving optical device, and an uplink signal transmitting device; a pin of the second optical circulator is connected to a transmitting end of the uplink signal transmitting device, 2 feet of the second optical circulator are connected to the input end of the downlink signal receiving optical device through the tunable optical filter, and the 3 legs of the second optical circulator are connected to the ONU;
  • the uplink signal transmitting device transmits the uplink signal to the second optical circulator, then enters the optical splitter in reverse, and then transmits the optical fiber into the OLT through the single-film optical fiber, and the uplink direct-adjusting signal is amplified by the optical amplifier and transmitted to the first optical circulator, and then After the ⁇ raster enters the uplink signal receiving device, the uplink signal transmission is completed.
  • the downlink signal transmitting device is a 10 Gbps ⁇ management laser or DFB+MZM.
  • the uplink signal receiving device is a 10G APD.
  • the dispersion compensation amount of the chirped grating is set to compensate for the dispersion accumulated by the single film fiber 40 km.
  • the amplifier is a common commercial EDFA with a gain bandwidth of 1510 nm to 1560 nm, a maximum output power of 23 dBm, and a maximum gain multiple of 35 dB.
  • the tunable optical filter is a commercial optical filter, and has an output power of 3 dBm and a gain bandwidth of 1530 nm to 1610 nm.
  • the uplink signal transmitting device is a direct-adjusting DFB laser having a center wavelength of 1543 nm, a maximum output power of 10 dBm, a pulse signal generator (PPG) generating a signal rate of 10 Gbps, and a pseudo-random sequence length of 2 used. ⁇ 31.
  • the invention also provides a dispersion compensation method for a long-distance passive optical network system based on a chirped grating, comprising the following steps:
  • a chirped grating is connected between the upstream signal receiving device RX and the optical circulator WDM, and the chirped grating can generate a fixed dispersion compensation amount to compensate the received signal;
  • the direct-modulated laser signal from the ONU that is, the uplink signal
  • the direct-modulated laser signal from the ONU is transmitted through the single-mode fiber and enters the chirped grating in the OLT.
  • Different wavelengths of light pass through different paths in the chirped grating, thereby generating different delays and realizing the laser.
  • the compensation of ⁇ and fiber dispersion completes the high-quality transmission of the uplink signal.
  • the invention accesses a chirped grating at the OLT end, and gives a fixed negative dispersion compensation amount to the direct modulation signal through the chirped grating, which not only compensates for the chirp of the direct modulation signal, but also compensates for the cumulative dispersion of the ordinary single mode fiber; Complete high-quality transmission of the uplink signal; and because the direct-adjustment signal has a positive-negative characteristic, it has a greater tolerance range for dispersion.
  • the tolerance limit for the 10 Gbps signal is as high as -200 ps/nm to 2,450 ps/nm. Manage both to achieve long-distance transmission of high-speed signals.
  • FIG. 1 is a block diagram of a long-distance passive optical network system based on a chirped grating in the present invention
  • FIG. 2 is a schematic diagram of a chirped grating fiber in the present invention
  • FIG. 3 is a schematic diagram of a long-distance passive optical network system based on a chirped grating in the present invention
  • FIG. 4 is an eye diagram of a 10 Gbps uplink signal transmitted at different distances according to the present invention.
  • FIG. 1 it is a block diagram of a chromatic dispersion compensation passive optical network system, which is composed of an OLT (optical line terminal), an ODN (optical transmission unit), and an ONU (optical network unit).
  • the OLT and the ONU are connected through the ODN, and the device of the RN node in the ODN may be an optical power splitter, a wavelength router, or a combination of the two.
  • the system is connected with a chirped grating between the upstream signal receiving device RX of the OLT (optical line terminal) and the optical circulator WDM, and the chirped grating can generate a fixed dispersion compensation amount to compensate the received signal;
  • the principle is shown in Figure 2.
  • the grating is periodically changed by a certain technique on a common fiber. When the optical signal enters the grating, the light with twice the wavelength of the grating will be reflected, and the light of different wavelengths is in the chirped grating. The positions of the reflection points are different, so different wavelengths in the wavelength of the incident light pass through different paths in the grating, thereby generating different delays for the purpose of dispersion compensation.
  • the uplink signal is from the direct modulation laser signal of the ONU (optical network unit), and the direct modulation optical signal is transmitted through the optical fiber and enters the chirped grating in the OLT (optical line terminal), since the direct modulation signal has a positive Moreover, the optical signal is transmitted through the G.652 fiber to generate anomalous dispersion, so that the dispersion of the signal is further increased.
  • the ⁇ grating of the OLT (optical line terminal) generates a large fixed dispersion, and after the optical signal passes through the ⁇ grating, the compensation of the laser ⁇ and the optical fiber dispersion can be realized, and the high-quality transmission of the uplink signal is completed.
  • the signal has ⁇ characteristics, it has a greater tolerance to dispersion.
  • the tolerance of 10Gbps signal can reach -200ps/nm ⁇ 2450ps/nm, and the management of both can achieve high-speed signal length. Distance transfer.
  • the ⁇ -grating-based long-distance passive optical network system includes an OLT (Optical Line Terminal) 101, an ODN (Optical Transmission Unit) 102, an ONU (Optical Network Unit) 103, and an OLT ( 101) Connect to the ONU (103) network through the ODN (102).
  • OLT Optical Line Terminal
  • ODN Optical Transmission Unit
  • ONU Optical Network Unit
  • OLT 101
  • the OLT (101) includes a downlink signal transmitting device 1, an uplink signal receiving device 2, a chirped grating 3, a first optical circulator 4, and an optical amplifier 5; a pin 1 of the first optical circulator 4 receives the uplink signal through the chirped grating 3
  • the transmitting end of the device 2 is connected, the 2 pin of the first optical circulator 4 is connected to the transmitting end of the downlink signal transmitting device 1, and the 3 legs of the first optical circulator 4 pass
  • the optical amplifier 5 is connected to the ODN (102).
  • the downlink signal transmitting apparatus 1 described above may be a 10 Gbps Helium Management Laser (CML) or a DFB + MZM.
  • CML Helium Management Laser
  • DFB + MZM DFB + MZM
  • the above uplink signal receiving device 2 is a 10G APD.
  • the above-mentioned chirped grating has a dispersion compensation amount that can compensate for the dispersion accumulated by a single film fiber (G.652) of 40 km, which is equivalent to -680 ps/nm.
  • the optical amplifier 5 is a general commercial EDFA with a gain bandwidth of 1510 nm to 1560 nm, a maximum output power of 23 dBm, and a maximum gain multiple of 35 dB, which is used to improve the power of the downlink signal injected into the optical fiber and improve the uplink signal receiving sensitivity.
  • ODN (102) includes a common single-film optical fiber (G.652) 6 connected to a splitter (Splitter) 7;
  • the ONU (103) includes a second optical circulator 8, a tunable optical filter 9, a downlink signal receiving optical device 10, and an uplink signal transmitting device 11;
  • One end of the ODN (102) is connected to the OLT (101) through the single-film optical fiber 6, and the other end is connected to the 3rd leg of the second optical circulator 8 in the ONU (103) through the optical splitter 7, and the 1st pin of the second optical circulator 8 is
  • the transmitting end of the upstream signal transmitting device 11 is connected, and the second leg of the second optical circulator 8 is connected to the input end of the downstream signal receiving optical device 10 through the tunable optical filter 9.
  • the splitter 7 mainly sends the downlink data signals to the respective ONUs connected thereto, and the uplink data of different wavelengths of different ONUs are coupled by the optical splitter 7, and the coupled uplink data is uploaded to the OLT through the single-film optical fiber 6 (101). ) for processing.
  • the above single film fiber 6 is a common commercial single film fiber.
  • the above spectroscope 7 is a general commercial spectroscope.
  • the tunable optical filter described above is a commercial tunable optical filter having an output power of 3 dBm and a gain bandwidth of 1530 nm to 1610 nm.
  • the above-described downlink signal light receiving device 10 is a 10G PIN.
  • the above-mentioned uplink signal transmitting device 11 is a modulated direct modulation laser having a center wavelength of 1543 nm, a maximum output power of 10 dBm, a pulse signal generator (PPG) generating a signal rate of 10 Gbps, and a pseudo random sequence (PRBS) length of 2 ⁇ . 31.
  • PPG pulse signal generator
  • PRBS pseudo random sequence
  • the downlink signal transmitting device 1 sends a downlink signal, enters the optical amplifier 5 through the first optical circulator 4, and after the signal is amplified, enters the single-film optical fiber 6, and then enters the optical splitter 7, and the optical splitter 7 distributes the downlink signal to different ONUs ( 103), the downlink signal entering the ONU (103) enters the tunable filter 9 via the second optical circulator 8, selects the desired wavelength signal, and transmits it to the downlink signal receiving device 10 to complete the downlink signal transmission; the uplink signal
  • the transmitting device 11 transmits the uplink signal to the second optical circulator 8, that is, the direct modulation signal is transmitted to the second optical circulator 8, and then enters the optical multiplexer 7 in reverse, and the optical splitter 7 realizes the combination of the uplink signals and is coupled.
  • the film fiber 6 is transmitted into the OLT (101), and the up-regulated signal is amplified by the optical amplifier 5, transmitted to the first optical circulator 4, and then passed through the ⁇ grating 3. At this time, the ⁇ grating 3 gives a fixed negative dispersion compensation signal. The quantity can not only compensate the flaw of the direct modulation signal, but also compensate the accumulated dispersion of the ordinary single mode fiber. Finally, the signal is received by the uplink signal receiving device 2 to complete the uplink signal transmission.
  • the invention also provides a dispersion compensation method for a long-distance passive optical network system based on a chirped grating, comprising the following steps:
  • a chirped grating is connected between the upstream signal receiving device 2 and the first optical ring 4 (WDM), and the chirped grating can generate a fixed dispersion compensation amount to compensate the received signal;
  • the direct-modulated laser signal from the ONU that is, the uplink signal
  • the direct-modulated laser signal from the ONU is transmitted through the single-mode fiber and enters the chirped grating in the OLT.
  • Different wavelengths of light pass through different paths in the chirped grating, thereby generating different delays and realizing the laser.
  • the compensation of ⁇ and fiber dispersion completes the high-quality transmission of the uplink signal.
  • the signal emitted by the modulated direct-tuning laser itself has a large positive-negative characteristic (the rising edge of the pulse, that is, the frequency of the leading edge is higher than the falling edge, that is, the frequency of the trailing edge), and the ordinary single-mode fiber is an anomalous dispersion fiber (ie, The dispersion coefficient D is greater than zero, that is to say, in a single-film fiber, the high-frequency component of the signal is transmitted faster than the low-frequency component of the signal.
  • the pulse front is longer than the pulse trailing edge. Running fast, which causes the signal pulse to rapidly broaden during transmission; and if it is in a normal dispersion fiber (ie, the dispersion coefficient D is less than zero, that is, the signal is transmitted in a normal dispersion fiber, the high frequency component of the signal is transmitted in a specific signal The low-frequency component is slow, the signal pulse front runs slower than the signal pulse trailing edge, and the signal pulse is first compressed and then broadened, which causes the signal quality to become better first and then change. difference.
  • the receiving end decides, a large negative dispersion compensation amount is given by the chirped grating, which not only compensates for the chirp of the direct modulation signal, but also compensates for the dispersion accumulation of the single mode fiber 6.
  • the effect is equivalent to
  • the modulated signal is transmitted in the normal dispersion fiber, that is, the signal quality first becomes better and then worsened; since in the optical access network, the power budget required for the near-end user is relatively low; and the remote user demand is large.
  • the power budget compensates for the attenuation of the fiber; thus, the point with the best signal quality can be placed at 40km by a certain optimization, so that the full coverage of 0-40km is achieved, and the signal power budget is gradually increased with the transmission distance, thereby achieving maximum The power budget value.
  • the eye diagram of the uplink signal under different transmission distances can be seen. As the transmission distance increases, the quality of the signal gradually increases. It can be clearly seen from the specific implementation effect of the embodiment.
  • the overall management scheme of direct modulation signal and fiber dispersion based on chirped grating can better realize the full range of high power budget transmission of signals from 0 to 40 km.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

本发明公开了一种基于啁啾光栅的长距离无源光网络系统及色散补偿方法，该系统包括光线路终端(OLT)、光传输单元(ODN)与光网络单元(ONU)，OLT通过ODN与ONU网络连接；OLT包括下行信号发射装置、上行信号接收装置、啁啾光栅、第一光环形器和光放大器；第一光环形器的1脚通过啁啾光栅与上行信号接收装置的发射端连接，第一光环形器的2脚连接下行信号发射装置的发射端，第一光环形器的3脚通过光放大器与ODN连接。本发明在OLT端接入了一啁啾光栅，通过啁啾光栅给予直调信号一个固定的负色散补偿量，不仅可补偿直调信号的啁啾，同时也补偿普通单模光纤的累积色散；又由于直调信号具有正啁啾特性，其对于色散的容忍范围更大，统筹管理两者，可实现高速信号的长距离传输。

Description

基于啁啾光栅的长距离无源光网络系统及色散补偿方法 技术领域
本发明涉及光通信技术领域，具体涉及基于啁啾光栅的长距离无源光网络系统及色散补偿方法。
背景技术
随着我国经济的迅速发展，用户通信带宽需求的急速增长，在各种宽带接入技术中，无源光网络以其容量大、传输距离长、较低成本、全业务支持等优势成为热门技术。
光接入网较于传统的光传输网最大的特点是其成本更低，尤其在于光网络单元(ONU)，其普遍采用成本相对低廉的直调激光器；另外减少局端的数量，以便于管理与降低成本，这样单个光线路终端(OLT)的覆盖范围逐步增加；但由于直调激光器的正啁啾与光纤反常色散的同时产生，导致直调信号在传输过程中迅速恶化，所以色散补偿成为长距离无源光接入网的必备措施。目前的色散补偿方案主要有如下几种：
(1)采用啁啾管理激光器(CML)实现。
D.Mahgerefteh等人于2006年在Optical FiberCommunication Conference(光纤通信大会，OFC)的会议上提出的(Chirp Managed Laser(CML):A compact transmitter for dispersion tolerant10Gbps networking applications](啁啾管理激光器：一个紧凑的10Gbps信号发射机网络应用模块))。其提出的啁啾管理激光器可实现10Gbps无色散补偿传输100km。具体方案是在直调激光器后面添 加一个合适的窄带滤波器，以滤除边带，从而压缩信号的频谱，提高信号传输距离；这种方案的缺点在于：直调激光器之后的整形滤波器成本相对较高，这不适合于成本敏感的无源光接入网。
(2)通过提高频谱利用率的方式实现。
N.Cheng等人于2013年在Communications and Photonics Conference(亚洲通信与光子学大会，ACP)提出“10Gb/s Upstream Transmission in TWDM PON UsingDuobinary and PAM-4Modulations with Directly Modulated Tunable DBR Laser”(在TWDM-PON上行链路中，利用双二进制和四电平脉冲幅度调制格式信号调制直调激光器传输10Gbps信号)。该方案利用双二进制和四电平脉冲幅度调制格式传输10Gbps信号，成功实现20km信号的传输。这种方案的缺点在于：当信号传输到40km的时候，信号劣化特别严重。
有鉴于此，急需提供一种低成本、高性能的方式完成上行信号高质量、长距离的传输。
发明内容
本发明所要解决的技术问题是使用简单、低成本的器件，实现10Gbps及以上高速上行信号达到40km及以上的高功率传输的问题。
为了解决上述技术问题，本发明所采用的基于啁啾光栅的长距离无源光网络系统，包括OLT(光线路终端)、ODN(光传输单元)与ONU(光网络单元)；
所述OLT通过所述ODN与所述ONU网络连接；所述OLT包括下行信号发射装置、上行信号接收装置、啁啾光栅、第一光环形器和光放大器；所述第一光环形器的1脚通过所述啁啾光栅与所述上行信号接收装置的发射端连接，所述第一光环形器的2脚连接下所述行信号发 射装置的发射端，所述第一光环形器的3脚通过所述光放大器与所述ODN连接。
所述ODN包括分光器和连接到分光器上的单膜光纤，单膜光纤连接所述OLT,所述分光器连接所述ONU；
所述ONU包括第二光环形器、可调光滤波器、下行信号接收光装置与上行信号发射装置；所述第二光环形器的1脚与所述上行信号发射装置发射端连接，所述第二光环形器的2脚通过所述可调光滤波器与所述下行信号接收光装置输入端连接，所述第二光环形器的3脚与所述ONU连接；
上行信号发射装置将上行信号传入第二光环形器，然后反向进入分光器，再经单膜光纤传输进入OLT，上行直调信号经光放大器放大，传入第一光环形器，之后再经过啁啾光栅进入上行信号接收装置，完成上行信号传输。
上述方案中，所述下行信号发射装置为10Gbps啁啾管理激光器或DFB+MZM。
上述方案中，所述上行信号接收装置为10G APD。
上述方案中，所述啁啾光栅的色散补偿量设置为补偿单膜光纤40km所累积的色散。
上述方案中，所述放大器是普通商用EDFA，其增益带宽为1510nm～1560nm，最大输出功率是23dBm，最大增益倍数是35dB。
上述方案中，所述可调光滤波器是商用光滤波器，其输出功率为3dBm，增益带宽为是1530nm～1610nm。
上述方案中，所述上行信号发射装置为直调DFB激光器，其中心波长为1543nm，最大输出功率是10dBm，脉冲信号产生器(PPG)发生的信号速率为10Gbps，所用的伪随机序列长度为2～31。
本发明还提供了基于啁啾光栅的长距离无源光网络系统色散补偿方法，包括以下步骤：
上行信号接收装置RX与光环形器WDM间接入了一个啁啾光栅，此啁啾光栅可产生固定的色散补偿量对接收到的信号进行补偿；
来自ONU的直调激光信号，即上行信号，经过单模光纤传输后，进入OLT中的啁啾光栅，不同波长的光在啁啾光栅中经过不同路径，从而产生不同的时延，实现对激光器啁啾和光纤色散的补偿，完成上行信号高质量的传输。
本发明在OLT端接入一啁啾光栅，通过啁啾光栅给予直调信号一个固定的负色散补偿量，不仅可补偿直调信号的啁啾，同时也补偿普通单模光纤的累积色散；从而完成上行信号高质量传输；又由于直调信号具有正啁啾特性，其对于色散的容忍范围更大，在实验中发现对于10Gbps信号其容忍限度大可达-200ps/nm～2450ps/nm，统筹管理两者，可实现高速信号的长距离传输。
附图说明
图1为本发明中基于啁啾光栅的长距离无源光网络系统框图；
图2为本发明中啁啾光栅光纤原理图；
图3为本发明中基于啁啾光栅的长距离无源光网络系统原理图；
图4为本发明中10Gbps上行信号不同距离传输时的眼图。
具体实施方式
下面结合具体实施方式和说明书附图对本发明做出详细的说明。
如图1所示，为本发明色散啁啾补偿无源光网络系统框图，该系统由OLT(光线路终端)、ODN(光传输单元)与ONU(光网络单元)组成， 通过ODN连接OLT和ONU，ODN中RN节点的器件可以是光功率分配器，也可是波长路由器，或者两者的组合。
该系统是在OLT(光线路终端)的上行信号接收装置RX与光环形器WDM间接入了一个啁啾光栅，此啁啾光栅可产生固定的色散补偿量对接收到的信号进行补偿；其工作原理如图2所示，在普通光纤上用一定的技术刻出周期性变化的光栅，当光信号进入光栅后，波长为光栅周期两倍的光将被反射，不同波长的光在啁啾光栅中反射点的位置不同，因此入射光波长中的不同波长在光栅中经过不同路径，从而产生不同的时延以达到色散补偿的目的。
该系统中上行信号来自于ONU(光网络单元)的直调激光信号，该直调光信号经过光纤传输后，进入OLT(光线路终端)中的啁啾光栅，由于直调信号具有正啁啾，而且光信号经过G.652光纤传输产生反常色散，使得信号的色散累积进一步加大。在OLT(光线路终端)的啁啾光栅产生一个大的固定色散，光信号经过啁啾光栅后，可实现对激光器啁啾和光纤色散的补偿，完成上行信号高质量的传输。又由于信号具有啁啾特性，其对于色散的容忍范围更大，在实验中发现对于10Gbps信号其容忍限度大可达-200ps/nm～2450ps/nm，统筹管理两者，可实现高速信号的长距离传输。
如图3所示，本发明提供的基于啁啾光栅的长距离无源光网络系统，包括OLT(光线路终端)101、ODN(光传输单元)102与ONU(光网络单元)103，OLT(101)通过ODN(102)与ONU(103)网络连接。
OLT(101)包括下行信号发射装置1、上行信号接收装置2、啁啾光栅3、第一光环形器4和光放大器5；第一光环形器4的1脚通过啁啾光栅3与上行信号接收装置2的发射端连接，第一光环形器4的2脚连接下行信号发射装置1的发射端，第一光环形器4的3脚通过 光放大器5与ODN(102)连接。
上述的下行信号发射装置1可以为10Gbps的啁啾管理激光器(CML)，也可以是DFB+MZM。
上述上行信号接收装置2是10G APD。
上述啁啾光栅其色散补偿量可以补偿单膜光纤(G.652)40km所累积的色散，相当于-680ps/nm。
上述光放大器5是普通商用EDFA，增益带宽为1510nm～1560nm，最大输出功率是23dBm，最大增益倍数是35dB，用于提高下行信号注入光纤的功率，并提高上行信号接收灵敏度。
ODN(102)包括普通的单膜光纤(G.652)6与分光器(Splitter)7连接；
ONU(103)包括第二光环形器8、可调光滤波器9、下行信号接收光装置10和上行信号发射装置11；
ODN(102)的一端通过单膜光纤6连接OLT(101),另一端通过分光器7与ONU(103)中第二光环形器8的3脚连接，第二光环形器8的1脚与上行信号发射装置11发射端连接，第二光环形器8的2脚通过可调光滤波器9与下行信号接收光装置10输入端连接。
分光器7主要是将下行数据信号发给与之相连的各个ONU，同时不同的ONU的不同波长的上行数据通过分光器7进行耦合，耦合后的上行数据通过单膜光纤6上传到OLT(101)进行处理。
上述的单膜光纤6是普通商用单膜光纤。
上述的分光器7是普通商用分光器。
上述的可调光滤波器是9是商用可调光滤波器，输出功率为3dBm，增益带宽为是1530nm～1610nm。
上述的下行信号光接收装置10是10G PIN。
上述的上行信号发射装置11是调制直调激光器，中心波长是1543nm，最大输出功率是10dBm，脉冲信号产生器(PPG)发生的信号速率为10Gbps，所用的伪随机序列(PRBS)长度为2^31。
下面具体介绍本实施例系统的工作原理，由于实施例关注的是上行色散啁啾管理，下行暂不具体详解。
首先下行信号发射装置1发出下行信号，通过第一光环形器4进入光放大器5，信号经放大之后进入单膜光纤6，然后进入分光器7，分光器7将下行信号分给不同的ONU(103)，进入ONU(103)的下行信号经第二光环形器8进入可调滤波器9，选出所需的波长信号，将之传递给下行信号接收装置10，完成下行信号传输；上行信号发射装置11将上行信号传入第二光环形器8，即将直调信号传入第二光环形器8，然后反向进入分光器7，分光器7实现上行信号的合并且耦合后，经单膜光纤6传输进入OLT(101)，上行直调信号经光放大器5放大，传入第一光环形器4，再经啁啾光栅3，此时啁啾光栅3给予信号一个固定的负色散补偿量，不仅可补偿直调信号的啁啾，同时也补偿普通单模光纤的累积色散，最后信号由上行信号接收装置2接收，完成上行信号传输。
本发明还提供了基于啁啾光栅的长距离无源光网络系统色散补偿方法，包括以下步骤：
上行信号接收装置2与第一光环形4(WDM)间接入了一个啁啾光栅，此啁啾光栅可产生固定的色散补偿量对接收到的信号进行补偿；
来自ONU的直调激光信号，即上行信号，经过单模光纤传输后，进入OLT中的啁啾光栅，不同波长的光在啁啾光栅中经过不同路径，从而产生不同的时延，实现对激光器啁啾和光纤色散的补偿，完成上行信号高质量的传输。
本色散补偿方法的依据思想是：
充分利用直调信号的正啁啾与单膜光纤6光纤色散的特性，统筹管理两者，实现0～40km全范围覆盖色散补偿。具体的讲，调制直调激光器发出的信号本身具有很大的正啁啾特性(脉冲上升沿即前沿的频率比下降沿即后沿的频率高)，而普通单模光纤是反常色散光纤(即色散系数D大于零，也就是说在单膜光纤中，信号的高频成分传输的比信号的低频成分快)，因此直调信号在普通单模光纤中传输的时候，脉冲前沿比脉冲后沿跑的快，这导致信号脉冲在传输过程中迅速展宽；而如果在正常色散光纤(即色散系数D小于零，也就是说信号在正常色散光纤中传输，信号的高频成分传输的比信号的低频成分慢)，则信号脉冲前沿跑得比信号脉冲后沿跑的慢，信号脉冲先被压缩然后再被展宽，这就导致了信号的质量在传输的过程中，先变好，后再变差。
因此在接收端(OLT)判决之前通过啁啾光栅给予信号一个大的负色散补偿量，不仅可补偿直调信号的啁啾，同时也补偿单模光纤6的色散累积；其效果相当于，直调信号在正常色散光纤中传输，即信号质量先变好，再变差；由于在光接入网中，对于近端的用户，需求的功率预算相对较低；而远端的用户需求大的功率预算以补偿光纤衰减；从而可以将信号质量最好的点通过一定的优化，放置在40km处，从而实现0～40km全范围无缝覆盖，而且信号功率预算随传输距离逐渐增加，进而实现最大的功率预算值。
如图4所示为上行信号在不同的传输距离情况下的眼图，可以看的出来随着传输距离的增加，信号的质量逐渐提高，从本实施例的具体实施效果中可以明显看出，基于啁啾光栅的直调信号啁啾与光纤色散的统筹管理方案能够较好的实现信号的0～40km全范围高功率预算传输。
本发明不局限于上述最佳实施方式，任何人应该得知在本发明的启示下作出的结构变化，凡是与本发明具有相同或相近的技术方案，均落入本发明的保护范围之内。

Claims (8)

  1. 基于啁啾光栅的长距离无源光网络系统，包括：通过ODN连接的OLT和ONU，其特征在于：
    所述OLT包括下行信号发射装置、上行信号接收装置、啁啾光栅、第一光环形器和光放大器；所述第一光环形器的1脚通过所述啁啾光栅与所述上行信号接收装置的发射端连接，所述第一光环形器的2脚连接所述下行信号发射装置的发射端，所述第一光环形器的3脚通过所述光放大器与所述ODN连接；
    所述ODN包括分光器和连接到分光器上的单膜光纤，单膜光纤连接所述OLT,所述分光器连接所述ONU；
    所述ONU包括第二光环形器、可调光滤波器、下行信号接收光装置与上行信号发射装置；所述第二光环形器的1脚与所述上行信号发射装置发射端连接，所述第二光环形器的2脚通过所述可调光滤波器与所述下行信号接收光装置输入端连接，所述第二光环形器的3脚与所述ONU连接；
    上行信号发射装置将上行信号传入第二光环形器，然后反向进入分光器，再经单膜光纤传输进入OLT，上行直调信号经光放大器放大，传入第一光环形器，之后再经过啁啾光栅进入上行信号接收装置，完成上行信号传输。
  2. 如权利要求1所述的基于啁啾光栅的长距离无源光网络系统，其特征在于，所述下行信号发射装置为10Gbps啁啾管理激光器或DFB+MZM。
  3. 如权利要求1所述的基于啁啾光栅的长距离无源光网络系统，其特征在于，所述上行信号接收装置为10G APD。
  4. 如权利要求1所述的基于啁啾光栅的长距离无源光网络系统， 其特征在于，所述啁啾光栅的色散补偿量设置为补偿单膜光纤40km所累积的色散。
  5. 如权利要求1所述的基于啁啾光栅的长距离无源光网络系统，其特征在于，所述放大器是普通商用EDFA，其增益带宽为1510nm～1560nm，最大输出功率是23dBm，最大增益倍数是35dB。
  6. 如权利要求1所述的基于啁啾光栅的长距离无源光网络系统，其特征在于，所述可调光滤波器是商用光滤波器，其输出功率为3dBm，增益带宽为是1530nm～1610nm。
  7. 如权利要求1所述的基于啁啾光栅的长距离无源光网络系统，其特征在于，所述上行信号发射装置为直调DFB激光器，其中心波长为1543nm，最大输出功率是10dBm，脉冲信号产生器(PPG)发生的信号速率为10Gbps，所用的伪随机序列长度为2～31。
  8. 基于啁啾光栅的长距离无源光网络系统色散补偿方法，其特征在于包括以下步骤：
    上行信号接收装置RX与光环形器WDM间接入了一个啁啾光栅，此啁啾光栅可产生固定的色散补偿量对接收到的信号进行补偿；
    来自ONU的直调激光信号，经过单模光纤传输后，进入OLT中的啁啾光栅，不同波长的光在啁啾光栅中经过不同路径，产生不同的时延，实现对激光器啁啾和光纤色散的补偿，完成上行信号高质量的传输。
PCT/CN2016/102819 2016-01-05 2016-10-21 基于啁啾光栅的长距离无源光网络系统及色散补偿方法 Ceased WO2017118153A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610003296.1A CN105553559B (zh) 2016-01-05 2016-01-05 基于啁啾光栅的长距离无源光网络系统及色散补偿方法
CN201610003296.1 2016-01-05

Publications (1)

Publication Number Publication Date
WO2017118153A1 true WO2017118153A1 (zh) 2017-07-13

Family

ID=55832515

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2016/102819 Ceased WO2017118153A1 (zh) 2016-01-05 2016-10-21 基于啁啾光栅的长距离无源光网络系统及色散补偿方法

Country Status (2)

Country Link
CN (1) CN105553559B (zh)
WO (1) WO2017118153A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113938213A (zh) * 2021-10-15 2022-01-14 西南交通大学 一种宽带微波与毫米波多普勒效应的光子学仿真方法
CN114268375A (zh) * 2021-12-30 2022-04-01 杭州电子科技大学 一种基于啁啾光纤光栅的光子压缩感知方法及系统

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105553559B (zh) * 2016-01-05 2018-11-30 烽火通信科技股份有限公司 基于啁啾光栅的长距离无源光网络系统及色散补偿方法
CN106130644B (zh) * 2016-07-20 2018-04-03 上海交通大学 基于色散过补偿的频域均衡方法
CN112910557B (zh) * 2021-01-14 2022-04-19 清华大学 用于长距离时间频率信号传输的色散补偿方法和系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104052547A (zh) * 2014-05-23 2014-09-17 同济大学 一种带有谐振腔的光纤非线性和色散效应补偿装置
CN104066018A (zh) * 2014-06-16 2014-09-24 上海交通大学 一种无源光网络无线前传的基带迁移系统
US9014568B2 (en) * 2012-02-16 2015-04-21 Nec Laboratories America, Inc. Next generation optical access network with centralized digital OLT
CN105553559A (zh) * 2016-01-05 2016-05-04 烽火通信科技股份有限公司 基于啁啾光栅的长距离无源光网络系统及色散补偿方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1187913C (zh) * 2002-08-29 2005-02-02 上海交通大学 非相干啁啾编码光码分多址接入系统
CN202160181U (zh) * 2011-08-05 2012-03-07 中国电子科技集团公司第三十四研究所 无中继光纤传输系统
CN202351455U (zh) * 2011-11-29 2012-07-25 中国计量学院 基于对称啁啾光纤光栅的无方向色散补偿器
CN103354625B (zh) * 2013-02-27 2016-05-04 上海交通大学 基于ofdm的堆叠波分时分复用的无源光网络传输系统
CN103313153A (zh) * 2013-06-19 2013-09-18 苏州彩云飞电子有限公司 多波长无源光网络系统
CN103730822B (zh) * 2013-12-19 2017-07-28 中国科学院西安光学精密机械研究所 超短脉冲光纤激光系统
CN203787754U (zh) * 2014-01-21 2014-08-20 中国计量学院 一种基于啁啾光栅和随机分布反馈的多波长光纤激光器
CN104796376B (zh) * 2015-04-27 2019-04-23 杭州电子科技大学 基于滤波器组的多载波调制的无源光网络下行传输系统
CN105007546B (zh) * 2015-06-30 2018-12-18 上海交通大学 基于波长固定和波长可调激光器的twdm-pon系统及方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9014568B2 (en) * 2012-02-16 2015-04-21 Nec Laboratories America, Inc. Next generation optical access network with centralized digital OLT
CN104052547A (zh) * 2014-05-23 2014-09-17 同济大学 一种带有谐振腔的光纤非线性和色散效应补偿装置
CN104066018A (zh) * 2014-06-16 2014-09-24 上海交通大学 一种无源光网络无线前传的基带迁移系统
CN105553559A (zh) * 2016-01-05 2016-05-04 烽火通信科技股份有限公司 基于啁啾光栅的长距离无源光网络系统及色散补偿方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113938213A (zh) * 2021-10-15 2022-01-14 西南交通大学 一种宽带微波与毫米波多普勒效应的光子学仿真方法
CN113938213B (zh) * 2021-10-15 2022-12-06 西南交通大学 一种宽带微波与毫米波多普勒效应的光子学仿真方法
CN114268375A (zh) * 2021-12-30 2022-04-01 杭州电子科技大学 一种基于啁啾光纤光栅的光子压缩感知方法及系统

Also Published As

Publication number Publication date
CN105553559A (zh) 2016-05-04
CN105553559B (zh) 2018-11-30

Similar Documents

Publication Publication Date Title
Ye et al. Demonstration of high-performance cost-effective 100-Gb/s TWDM-PON using 4× 25-Gb/s optical duobinary channels with 16-GHz APD and receiver-side post-equalization
WO2017118153A1 (zh) 基于啁啾光栅的长距离无源光网络系统及色散补偿方法
Cheng et al. World's first demonstration of pluggable optical transceiver modules for flexible TWDM PONs
CN103229433A (zh) 一种光线路终端、光时域反射计及光信号收发方法和系统
Rosales et al. First Demonstration of an E2 Class Downstream Link for 50Gb/s PON at 1342nm
JP2010166279A (ja) 光通信システムおよび光集線装置
Wang et al. Real-Time 50Gb/s Upstream Transmission in TDM-PON with Class E1 Power Budget Using Ge/Si Avalanche Photodiode and Bismuth-Doped Fiber as Preamplifier
Nesset et al. 10 Gbit/s bidirectional transmission in 1024-way split, 110 km reach, PON system using commercial transceiver modules, super FEC and EDC
Schrenk Wideband FTTR PON for joint wired and shortwave optical wireless access
Venkatasubramani et al. Tbps IM/DD transmission over 10 km SMF with O-band quantum dot laser comb for DCIs
Ossieur et al. Hybrid DWDM-TDMA PONs for next generation access
Dhaam et al. Performance analysis of high speed bit-interleaving time-division multiplexing passive optical networks (TDM-PONs)
Motaghiannezam et al. Single chip 52 Gb/s PAM4 transmission through-58 and+ 10 ps/nm chromatic dispersion using directly modulated laser
CN105580222A (zh) 光发射系统
Yu et al. 40-Gb/s wavelength-division-multiplexing passive optical network with centralized lightwave source
Raharimanitra et al. 40 Gb/s NG-PON system using low electrical bandwidth tunable receiver and emitter at 10 Gb/s
WO2020238279A1 (zh) 一种plc芯片、tosa、bosa、光模块、以及光网络设备
Begam et al. Investigation and Demonstration of Hybrid Passive Optical Networks for Smart City Application
CN100454788C (zh) 一种无源光网络
Li et al. Penalty-Free $400\text {Gb}/\mathrm {s} 4\lambda $ WDM Transmission in NANF with Linear FFE Only Reaching 42dB Optical Budget for Mobile X-Haul
Kachhatiya et al. Mitigation of fiber nonlinearity in multi-wavelength passive optical networks by optimizing launch power
Yi et al. First demonstration of symmetric 40-Gb/s TWDM-PON with 100-km passive reach and 1024-split using direct modulation and direct detection
Ji et al. 700G/280G SDM-TWDM-PON over 20km Seven-Core Fibre based on 10G-Class Optical Components
Makwana et al. Evaluation of a 4-Channel WDM-PON System with Erbium-Doped Fiber Amplifier for High Bandwidth Applications.
Ma et al. C-Band 350Gb/s 8.52-km Optical Interconnect Enabled by Anti-Resonant Hollow-Core Fiber and PS-PAM16

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16883281

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16883281

Country of ref document: EP

Kind code of ref document: A1