WO2008080299A1 - Module transpondeur 40 gb/s a adaptateurs rf - Google Patents

Module transpondeur 40 gb/s a adaptateurs rf Download PDF

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Publication number
WO2008080299A1
WO2008080299A1 PCT/CN2007/003635 CN2007003635W WO2008080299A1 WO 2008080299 A1 WO2008080299 A1 WO 2008080299A1 CN 2007003635 W CN2007003635 W CN 2007003635W WO 2008080299 A1 WO2008080299 A1 WO 2008080299A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
adaptor
transponder module
multiplexing
electrical
Prior art date
Application number
PCT/CN2007/003635
Other languages
English (en)
Inventor
Yi Hu
Fanrong Gao
Jianfeng Luo
Hui Zou
Long Chan
Original Assignee
Wuhan Telecommunications Devices 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
Priority claimed from CNU2006201701090U external-priority patent/CN200994139Y/zh
Priority claimed from CNU2006201727974U external-priority patent/CN200994140Y/zh
Application filed by Wuhan Telecommunications Devices Co., Ltd. filed Critical Wuhan Telecommunications Devices Co., Ltd.
Publication of WO2008080299A1 publication Critical patent/WO2008080299A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4274—Electrical aspects
    • G02B6/4277—Protection against electromagnetic interference [EMI], e.g. shielding means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4274—Electrical aspects
    • G02B6/4279—Radio frequency signal propagation aspects of the electrical connection, high frequency adaptations

Definitions

  • the present invention relates to a transponder module, and particularly relates to a 40 Gb/s transponder module capable of keeping the integrity of a high-speed RF signal.
  • a 40 Gb/s transponder module is one of the key technologies of a 40 Gb/s optical fiber transmission system.
  • the 40 Gb/s transponder module is also used in other applications, especially in short-distance data communication applications, such as communications between super computers and applications requiring real-time massive data transmission.
  • the 40 Gb/s transponder module is a bi-directional module device for providing a compatible electrical/optical interface between the optical physical layer and the electrical section layer of the Synchronous Digital Hierarchy (SDH).
  • a 40 Gb/s optical transmitter and a 40 Gb/s optical receiver are integrated in the module, which has a function of 16-channel multiplexing and de-multiplexing and processes a high-speed (40 Gb/s) electrical signal completely within the module.
  • An external electrical interface transmits/receives 16 channels of 2.5 Gb/s data signals.
  • the module also includes a clock synthesis circuit and a clock recovery circuit.
  • Figs. 1 and 2 show block diagrams for a conventional 40 Gb/s transponder module viewed from the electrical signal side and the optical signal side, respectively.
  • a 40 Gb/s high-speed electrical signal obtained by optical/electrical conversion is inputted into a de-multiplexing unit 101 via an RF cable.
  • 16 channels of 2.5 Gb/s low-speed electrical signals are obtained by de-multiplexing at the unit 101.
  • a matching unit 103 is connected to the de-multiplexing unit 101 via an RF cable for the purpose of impedance matching.
  • a multiplexing unit 102 16 channels of 2.5 Gb/s low-speed electrical signals from an external circuit are inputted into a multiplexing unit 102.
  • a 40 Gb/s high-speed electrical signal obtained by multiplexing at the unit 102 is outputted via an RF cable to be converted to a 40 Gb/s optical signal by optical/electrical conversion.
  • a matching unit 104 is connected to the multiplexing unit 102 via an RF cable for the purpose of impedance matching.
  • an input 40 Gb/s optical signal is inputted into a de-multiplexing unit 201 after being converted into a 40 Gb/s electrical signal by an optical/electrical converting unit 205, so that the operation described above with reference to Fig. 1 is performed.
  • 16 channels of 2.5 Gb/s low-speed electrical signals from the external circuit are multiplexed to a 40 Gb/s electrical signal at a multiplexing unit 202 by the operation described above with reference to Fig. 1 , then the 40 Gb/s electrical signal is inputted into a driver unit 206 so as to drive an electrical/optical converting unit 207 to output a 40 Gb/s optical signal.
  • circuits and matching units in the 40 Gb/s transponder module are implemented on a printed circuit board (PCB), wherein resistors and capacitors are used and wires are arranged on the PCB to transfer high-speed signals.
  • PCB printed circuit board
  • This structure has the following defects for the 40 Gb/s high-speed electrical signal: 1. Because the 40 Gb/s high-speed signal has critical requirements on transfer impedance matching, even a slight mismatch of impedance will cause distortions of the signal and a massive reflection and radiation of the high-speed signal.
  • the 40 Gb/s high-speed signal is transferred in form of microwave field, wherein the transfer attenuation of the high-speed signal is in proportion to the square of the transfer distance, a slightly longer transfer distance will cause a significantly decrease of the intensity and energy of the 40 Gb/s signal, that is, the transfer loss is great.
  • the present invention is proposed to provide a transponder module capable of keeping the integrity of a high-speed RF signal.
  • a transponder module including an RF adaptor in an electrical signal path on a high-speed differential signal port side of a multiplexing or de-multiplexing unit.
  • a transponder module including a de-multiplexing unit and a multiplexing unit.
  • An impedance matching unit on one end of a high-speed differential signal input port of the de-multiplexing unit and/or an impedance matching unit on one end of a high-speed differential signal output port of the multiplexing unit include an RF adaptor.
  • a transponder module including an optical/electrical converting unit, a de-multiplexing unit, an electrical/optical converting unit, a driver unit and a multiplexing unit, wherein the optical/electrical converting unit and the de-multiplexing unit are connected via an RF adaptor, and/or the multiplexing unit and the driver unit are connected via an RF adaptor, and/or the driver unit and the electrical/optical converting unit are connected via an RF adaptor.
  • the solution of the present invention ensures the integrity of the high-speed RF signal transferred in the module with a simple structure.
  • Fig. 1 shows a block diagram of a conventional 40 Gb/s transponder module.
  • Fig. 2 shows a block diagram of a conventional 40 Gb/s transponder module.
  • Fig. 3 shows a block diagram of a 40 Gb/s transponder module according to an embodiment of the present invention.
  • Fig. 4 shows a block diagram of a 40 Gb/s transponder module according to another embodiment of the present invention.
  • similar reference signs refer to similar elements.
  • the present invention realizes good matching within a 40 Gb/s transponder module by selecting proper components and using hard-connection.
  • Fig. 3 shows a block diagram of a 40 Gb/s transponder module according to a first embodiment of the present invention.
  • the 40 Gb/s transponder module according to the first embodiment of the present invention includes a de-multiplexing unit 301 and a multiplexing unit 302, which are the same as in the prior art shown in Fig. 1 and thus the detailed descriptions thereof are omitted.
  • a difference between this embodiment and the conventional technology is in matching units 303 and 304.
  • the matching unit 303 includes an RF adaptor 3031 , a high-frequency capacitor 3032 and a high-frequency impedance load component 3033 connected in serial.
  • the matching unit 304 includes an RF adaptor 3041 , a high-frequency capacitor 3042 and a high-frequency impedance load component 3043 connected in serial.
  • a 40 Gb/s optical signal is converted into an electrical signal by optical/electrical conversion.
  • the electrical signal is retimed by a clock data recovery circuit (CDR) in the de-multiplexing unit 301 to recover 40 Gb/s data and a clock.
  • CDR clock data recovery circuit
  • 16 channels of low-speed 2.5 Gb/s data and one channel of differential 2.5 GHz parallel clock are outputted via serial/parallel conversion. These data are outputted from a 2.5 Gb/s differential interface of the de-multiplexing unit 301.
  • the 40 Gb/s interface of the de-multiplexing unit 301 is a differential input, wherein only a single end is used.
  • the matching unit 303 serves to match the other end of the 40 Gb/s differential interface.
  • 16 channels of low-speed differential 2.5 Gb/s data and one channel of differential 2.5 GHz parallel clock input signal are inputted via a 2.5G differential interface of the multiplexing unit 302.
  • the input data is subject to parallel/serial conversion (synchronous multiplexing) and retiming in the multiplexing unit 302 to output a 40 Gb/s data signal.
  • the 40 Gb/s interface of the multiplexing unit 302 is a differential output, wherein only a single end is used.
  • the matching unit 304 serves to match the other end of the 40 Gb/s differential interface.
  • a CA-50 (50 Hz) coaxial cable available from SHF Company is used for the RF cable.
  • a V(M)-GPPO(F) type RF adaptor is used for the RF adaptor
  • a DC BLOCK type 8141 (40 GHz) is used for the high-frequency capacitor 3032/3042.
  • a ST4010 type 50-ohm impedance (40 GHz) is used for the high-frequency load component 3033/3043.
  • the matching unit 303 includes the RF adaptor 3031 (3041), the high-frequency capacitor 3032 (3042) and the high-frequency load impedance component 3033 (3043), resulting in a good transfer impedance matching, avoiding signal reflection and radiation caused by mismatch of the differential outputs and inputs.
  • the matching units 303 and 304 includes RF components that are well shielded and grounded, interferences of external electromagnetic waves are completely shielded and meanwhile the outward radiation of the 40 Gb/s high-speed signal is also shielded, resulting in good electromagnetic compatibility and anti-electromagnetic interference characteristics.
  • the signal transfer path is the shortest and thus the transfer loss is decreased. Consequently, the intensity and energy of the 40 Gb/s signal is maintained.
  • the 40 Gb/s high-speed electrical signal is only transferred in the high-speed connectors and the wide-band loads, which effectively avoids the reflection and mutual radiation interference of the high-speed signal, so that the transfer attenuation of the high-speed signal is decreased and the integrity of the high-speed signal is ensured.
  • Fig. 4 shows a block diagram of a 40 Gb/s transponder module according to a second embodiment of the present invention.
  • the 40 Gb/s transponder module according to the second embodiment of the present invention includes a de-multiplexing unit 401 , a multiplexing unit 402, an optical/electrical converting unit 405, a driver unit 406, and an electrical/optical converting unit 407, which are the same as in the prior art shown in Fig. 2, and thus the detailed descriptions thereof are omitted.
  • connection between the optical/electrical converting unit 405 and the de-multiplexing unit 401 , the connection between the multiplexing unit 402 and the driver unit 406, and the connection between the driver unit 406 and the electrical/optical converting unit 407 are hard-connected using an RF adaptor 403, an RF adaptor 4041 and an RF adaptor 4042, respectively.
  • a 40 Gb/s optical signal is converted into a 40 Gb/s electrical signal via the optical/electrical converting unit 405.
  • the 40Gb/s electrical signal enters into the electrical de-multiplexing unit 401 via a V(M) - GPPO (F) type RF adaptor 403.
  • the 40 Gb/s electrical signal is retimed by a clock data recovery circuit (CDR) to recover 40 Gb/s data and clock.
  • CDR clock data recovery circuit
  • 16 channels of low-speed 2.5 Gb/s data and one channel of differential 2.5 GHz parallel clock are outputted via serial/parallel conversion.
  • 16 channels of low-speed differential 2.5 Gb/s data and one channel of differential 2.5 GHz parallel clock input signal undergo parallel/serial conversion (synchronous multiplexing) and retiming in the multiplexing unit 402 to output a 40 Gb/s data signal via a GPPO type RF connector.
  • the 40 Gb/s data signal is hard-connected to the driver unit 406 via a GPPO(F) - V(M) type RF adaptor 4041 and is amplified at the driver unit 406.
  • the amplified 40 Gb/s data signal is hard-connected to an electrical input of the electrical/optical converting unit 407 using a GPPO(F) - V(M) type RF adaptor 4042 to undergo electrical/optical conversion and then a 40 Gb/s modulated optical signal is outputted.
  • a GPPO(F) - V(M) type RF adaptor 4042 to undergo electrical/optical conversion and then a 40 Gb/s modulated optical signal is outputted.
  • the signal transfer path is the shortest and thus the transfer loss is decreased. Consequently, the intensity and energy of the 40 Gb/s signal is maintained.
  • the transfer impedance matching is good and the quality of the signal is good, avoiding the reflection and radiation of the signal.
  • the 40 Gb/s high-speed signal is transferred in RF adaptors that are well shielded and grounded, interferences of external electromagnetic waves are completely shielded and meanwhile the outward radiation of the 40 Gb/s high-speed signal is also shielded, resulting in good electromagnetic compatibility and anti-electromagnetic interference characteristic.
  • this embodiment effectively ensures the integrity of the signal during the transfer of the 40 Gb/s high-speed signal and applies to the 40 Gb/s transponder module.
  • the RF adaptor is not necessarily the GPPO(F) - V(M) type RF adaptor.
  • Other adaptors such as GPPO(M) - V(F) type may be used.
  • the above two embodiments may be combined rather than be used separately.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

L'invention concerne un module transpondeur mettant en œuvre des adaptateurs RF. Dans ce module, un trajet de signal électrique sur le côté port de signal différentiel haute vitesse d'une unité de multiplexage ou de démultiplexage comprend lesdits adaptateurs RF. L'intégrité du signal RF haute vitesse est préservée grâce aux adaptateurs RF.
PCT/CN2007/003635 2006-12-30 2007-12-17 Module transpondeur 40 gb/s a adaptateurs rf WO2008080299A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200620170109.0 2006-12-30
CNU2006201701090U CN200994139Y (zh) 2006-12-30 2006-12-30 采用射频转接器硬连接方式的40Gb/s光电转发模块
CNU2006201727974U CN200994140Y (zh) 2006-12-30 2006-12-30 采用高速输入输出口匹配方式的40Gb/s光电转发模块
CN200620172797.4 2006-12-30

Publications (1)

Publication Number Publication Date
WO2008080299A1 true WO2008080299A1 (fr) 2008-07-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2007/003635 WO2008080299A1 (fr) 2006-12-30 2007-12-17 Module transpondeur 40 gb/s a adaptateurs rf

Country Status (1)

Country Link
WO (1) WO2008080299A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1327279A (zh) * 2000-05-30 2001-12-19 阿格瑞系统光电保护公司 具有阻抗匹配片的rf连接器
US7134796B2 (en) * 2004-08-25 2006-11-14 Opnext, Inc. XFP adapter module
US20060285851A1 (en) * 2005-06-16 2006-12-21 Jiaxi Kan Optical transceivers and methods to reduce interference in optical transceivers
CN200994139Y (zh) * 2006-12-30 2007-12-19 武汉电信器件有限公司 采用射频转接器硬连接方式的40Gb/s光电转发模块
CN200994140Y (zh) * 2006-12-30 2007-12-19 武汉电信器件有限公司 采用高速输入输出口匹配方式的40Gb/s光电转发模块

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1327279A (zh) * 2000-05-30 2001-12-19 阿格瑞系统光电保护公司 具有阻抗匹配片的rf连接器
US7134796B2 (en) * 2004-08-25 2006-11-14 Opnext, Inc. XFP adapter module
US20060285851A1 (en) * 2005-06-16 2006-12-21 Jiaxi Kan Optical transceivers and methods to reduce interference in optical transceivers
CN200994139Y (zh) * 2006-12-30 2007-12-19 武汉电信器件有限公司 采用射频转接器硬连接方式的40Gb/s光电转发模块
CN200994140Y (zh) * 2006-12-30 2007-12-19 武汉电信器件有限公司 采用高速输入输出口匹配方式的40Gb/s光电转发模块

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HU Y. ET AL.: "40Gbit/s MSA Protocol Standard Transponder Module", OFCIO, 2003 *

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