CN106936502B - GSM-R repeater Ethernet single-fiber optical transceiver with optical loss automatic gain compensation - Google Patents
GSM-R repeater Ethernet single-fiber optical transceiver with optical loss automatic gain compensation Download PDFInfo
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- CN106936502B CN106936502B CN201611223800.5A CN201611223800A CN106936502B CN 106936502 B CN106936502 B CN 106936502B CN 201611223800 A CN201611223800 A CN 201611223800A CN 106936502 B CN106936502 B CN 106936502B
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- 239000000835 fiber Substances 0.000 title claims abstract description 8
- 239000013307 optical fiber Substances 0.000 claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 19
- 230000008878 coupling Effects 0.000 claims abstract description 18
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- 238000012986 modification Methods 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/038—Arrangements for fault recovery using bypasses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15507—Relay station based processing for cell extension or control of coverage area
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Abstract
The invention provides a GSM-R repeater Ethernet single-fiber optical transceiver with optical loss automatic gain compensation, which comprises an input radio frequency channel, an output radio frequency channel, wavelength division multiplexing equipment and an Ethernet communication circuit; the input radio frequency channel comprises a filter circuit, an ALC control circuit, a radio frequency switch circuit, an amplifying circuit, an attenuation circuit, a coupling circuit and a laser circuit which are connected in sequence; the output radio frequency channel comprises a light receiver, a coupling circuit, an amplifying circuit, an ATT automatic compensation circuit and a filter circuit which are connected in sequence; the Ethernet communication circuit is respectively connected with the coupling circuits in the input radio frequency channel and the output radio frequency channel, and is provided with an Ethernet interface; the wavelength division multiplexing device is connected with the wavelength division multiplexing devices of the rest optical terminals through optical fibers or connected with a plurality of optical terminal modules through optical splitters. The invention improves the functionalization based on the existing analog optical terminal machine, so that the existing analog optical terminal machine has the optical loss automatic gain compensation.
Description
Technical Field
The invention relates to the field of railway optical fiber communication, in particular to a GSM-R repeater Ethernet single-fiber optical transceiver with optical loss automatic gain compensation.
Background
The analog optical transceiver module is one of key modules of the GSM-R analog optical fiber repeater, and mainly converts GSM-R radio frequency signals into optical signals for transmission through optical fibers. The analog optical terminal transmits the analog optical signal in the optical fiber, and the cost is low and the analog optical terminal is more commonly used. When data transmission is carried out, the analog optical terminal machine modulates a baseband signal into a radio frequency signal in an FSK mode, then carries out electric-optical conversion and then transmits the radio frequency signal, and after the optical signal is transmitted to the receiving terminal, the optical-electric conversion is carried out, then FSK demodulation is carried out, and the data signal is recovered. While by using Wavelength Division Multiplexing (WDM). Such analog optical terminals have some drawbacks: the method is mainly low in transmission rate and poor in anti-interference performance, is not suitable for the requirement of comprehensive and rapid transmission of the rail transit information, and prevents rapid development of the rail transit to a certain extent. In the coverage area of a railway tunnel in a weak field, optical fiber resources are very limited, and if a conventional optical transceiver module is adopted, a GSM-R analog optical fiber repeater cannot realize bidirectional transmission of image and data signals, and cannot provide a data transmission channel for a railway communication power supply, an environment monitoring system, emergency communication and video monitoring. The analog optical transceiver with Ethernet communication function is necessary to replace the conventional optical transceiver module, and the method can not only reduce optical fiber resources, but also greatly reduce engineering cost.
In addition, the analog repeater is affected by the optical fiber length in engineering application, so that the gain of the repeater system is inconsistent, and the gain difference between the nearest remote machine and the farthest remote machine of the repeater near-end machine can reach 10-20 dB, which is equivalent to 10-20 km more than the optical fiber length of the nearest remote machine. Therefore, repeater equipment with an optical loss automatic compensation function is required to reduce engineering design and application difficulty and improve repeater system stability.
Disclosure of Invention
The invention provides a GSM-R repeater Ethernet dual-fiber optical transceiver with optical loss automatic gain compensation, which aims to solve the problems in the prior art, and improves the functionalization based on the existing analog optical transceiver so as to lead the existing analog optical transceiver to have the optical loss automatic gain compensation.
The invention comprises an input radio frequency channel, an output radio frequency channel, wavelength division multiplexing equipment and an Ethernet communication circuit;
the input radio frequency channel comprises a filter circuit, an ALC control circuit, a radio frequency switch circuit, an amplifying circuit, an Attenuation (ATT) circuit, a coupling circuit and a laser circuit which are sequentially connected, wherein the filter circuit is connected to a radio frequency signal input interface, and the laser circuit is connected to wavelength division multiplexing equipment;
the output radio frequency channel comprises a light receiver, a coupling circuit, an amplifying circuit, an ATT automatic compensation circuit and a filter circuit which are sequentially connected, wherein the filter circuit is connected to a radio frequency signal output interface, the input frequency is 800 MHz-1000 MHz, and the light receiver is connected to wavelength division multiplexing equipment;
the Ethernet communication circuit is respectively connected with the coupling circuits in the input radio frequency channel and the output radio frequency channel, and is provided with an Ethernet interface;
the wavelength division multiplexing device is connected with the wavelength division multiplexing devices of the rest optical terminals through optical fibers or connected with a plurality of optical terminal modules through optical splitters.
In the input radio frequency channel, the filter circuit is a band-pass filter circuit and a matching circuit, and the band-pass filter circuit suppresses out-of-band input signals and suppresses FSK frequency (430-440 MHz) and Ethernet transmission frequency (7.5-65 MHz) of the analog optical transmitter and receiver; the ALC control circuit is an analog level automatic control circuit and is used for automatically controlling according to the input power, and when the input signal is larger, the output signal is consistent; the radio frequency switch circuit is used for controlling the optical transceiver module to have no signal output when the signal is input; the amplifying circuit is a radio frequency amplifier circuit and is composed of one or a plurality of stages of amplifiers; the attenuation circuit is an input port, the gain of the optical transceiver can be manually adjusted, and the attenuation range is 0-31 dB; the coupling circuit couples the Ethernet data signal and the data transmission data FSK signal to the main radio frequency link of the optical transceiver, and the signals are converted into optical signals by the laser and transmitted by the optical fiber; the laser is an analog electro-optic conversion circuit.
In the output radio frequency channel, the light receiver is an analog photoelectric conversion circuit; the coupling circuit receives an Ethernet data signal and a data transmission data FSK signal of an optical transceiver module of a terminal and the data transmission chip is coupled from a main radio frequency link to perform data processing; the amplifying circuit is a radio frequency amplifier circuit and is composed of one or a plurality of stages of amplifiers; the ATT automatic compensation circuit is used for realizing the automatic gain compensation function of the optical loss, and if the system is designed to compensate the 10dB optical loss, namely, when no optical loss exists, the attenuation value of the ATT attenuator is 20dB; once the loss of the optical path is D1 (the difference between the actual received light power value and the specified received light power value is calculated), the ATT attenuation value automatically becomes (20-2 xD 1) dB; the filter circuit is a multi-order band-pass filter circuit and a matching circuit, and ensures that the spurious index of the output port and the voltage standing wave ratio meet the use requirement.
The invention has the beneficial effects that:
1. the optical transceiver module has an optical loss automatic gain compensation function: the optical loss compensation capability of more than or equal to 10dB is achieved, the gain of the optical transceiver system is not influenced by the length of the optical fiber, and the system stability is improved;
2. supporting 200MHz broadband work, the working frequency range is 800 MHz-1000 MHz;
3. the module structure size of the original conventional analog optical transceiver is compatible, an Ethernet communication circuit is added inside the module structure size, and the module has the capacity of 100Mbps and above Ethernet data transmission;
4. having an ethernet interface communication interface: the Ethernet communication interface provides the high-speed transparent transmission capability of the Ethernet with the speed of 100Mbps for the repeater system, and provides a data transmission channel for a railway communication power supply, an environment monitoring system, emergency communication, video monitoring and the like;
5. the stray of the input and output ports of the optical transceiver module is low, so that the performance index requirement of repeater equipment is ensured;
6. stray index requirements: less than or equal to-60 dBm/100kHz (9 kHz-12.75 GHz); harmonic wave: less than or equal to-45 dBm;
7. the optical transceiver module has an ALC automatic level control function: ALC control range is-20- +5dBm (not limited to), the ALC adjusts the step length + -1 dB, the function ensures that when the input power is larger, the output power is kept unchanged, and intermodulation index is not deteriorated due to the overlarge input power;
8. the optical transceiver module supports a wide range of power detection capabilities: the detection range of the input power and the detection range of the output power are more than or equal to 40dB; the power can monitor the input power and the output power of the optical module, and brings convenience to the daily maintenance or overhaul and search of the repeater system;
9. the optical transceiver module has a radio frequency switch function: the isolation degree of the switch is more than or equal to 50dB, a redundant backup channel is formed by using a plurality of optical modules in the repeater system, and the backup channel can be ensured to have no signal passing through by closing the radio frequency switch, so that the reliability and the stability of the system are provided;
10. any optical transceiver can be provided with a plurality of optical transceiver modules with different wavelengths: the optical module of the repeater near-end machine can support the optical module connected with a plurality of repeater far-end machines, namely the optical module supports 1-to-many communication;
11. has the functions of warming and supplementing: ensuring the environment at-25 ℃ to +55 ℃, ensuring the gain stability to be less than or equal to +/-1 dB, ensuring the output power stability (ALC control time test) to be less than or equal to +/-1 dB, and ensuring the light output power stability to be less than or equal to +/-1 dB.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Description of the embodiments
The invention is further described below with reference to the accompanying drawings.
The circuit structure of the invention is shown in figure 1, and comprises an input radio frequency channel, an output radio frequency channel, wavelength division multiplexing equipment and an Ethernet communication circuit.
The input radio frequency channel comprises a filter circuit, an ALC control circuit, a radio frequency switch circuit, an amplifying circuit, an Attenuation (ATT) circuit, a coupling circuit and a laser circuit which are sequentially connected, wherein the filter circuit is connected to a radio frequency signal input interface, the input frequency is 800 MHz-1000 MHz, and the laser circuit is connected to wavelength division multiplexing equipment.
The output radio frequency channel comprises a light receiver, a coupling circuit, an amplifying circuit, an ATT automatic compensation circuit and a filter circuit which are sequentially connected, wherein the filter circuit is connected to a radio frequency signal output interface, and the light receiver is connected to wavelength division multiplexing equipment;
the Ethernet communication circuit is respectively connected with the coupling circuits in the input radio frequency channel and the output radio frequency channel, and is provided with an Ethernet interface.
The wavelength division multiplexing device is connected with the wavelength division multiplexing devices of the rest optical terminals through optical fibers or connected with a plurality of optical terminal modules through optical splitters.
In the input radio frequency channel, the filter circuit is a band-pass filter circuit and a matching circuit, and the band-pass filter circuit suppresses out-of-band input signals and suppresses FSK frequency (430-440 MHz) and Ethernet transmission frequency (7.5-65 MHz) of the analog optical transmitter and receiver; the ALC control circuit is an analog level automatic control circuit and is used for automatically controlling according to the input power, and when the input signal is larger, the output signal is consistent; the radio frequency switch circuit is used for controlling the optical transceiver module to have no signal output when the signal is input; the amplifying circuit is a radio frequency amplifier circuit and is composed of one or a plurality of stages of amplifiers; the attenuation circuit is an input port, the gain of the optical transceiver can be manually adjusted, and the attenuation range is 0-31 dB; the coupling circuit couples the Ethernet data signal and the data transmission data FSK signal to the main radio frequency link of the optical transceiver, and the signals are converted into optical signals by the laser and transmitted by the optical fiber; the laser is an analog electro-optic conversion circuit.
In the output radio frequency channel, the light receiver is an analog photoelectric conversion circuit; the coupling circuit receives an Ethernet data signal and a data transmission data FSK signal of an optical transceiver module of a terminal and the data transmission chip is coupled from a main radio frequency link to perform data processing; the amplifying circuit is a radio frequency amplifier circuit and is composed of one or a plurality of stages of amplifiers; the ATT automatic compensation circuit is used for realizing the automatic gain compensation function of the optical loss, and if the system is designed to compensate the 10dB optical loss, namely, when no optical loss exists, the attenuation value of the ATT attenuator is 20dB; once the loss of the optical path is D1 (the difference between the actual received light power value and the specified received light power value is calculated), the ATT attenuation value automatically becomes (20-2 xD 1) dB; the filter circuit is a multi-order band-pass filter circuit and a matching circuit, and ensures that the spurious index of the output port and the voltage standing wave ratio meet the use requirement.
Optical transceiver module automatic gain compensation function: in the use process of the analog optical module, the optical loss of the optical fiber has certain loss, namely 1dB optical loss is equal to the gain reduction of the radio frequency signal by 2dB, and in the practical engineering use, the length of the optical fiber is uncertain, so that when the analog repeater near-end machine is provided with a plurality of far-end machines, the radio frequency signals reaching each far-end machine are inconsistent, the system gain is not uniform, the phenomenon of poor conversation quality and the like can be caused, the phenomenon is avoided, the analog optical end machine module supports the function of automatic gain compensation, and the gain of the optical end machine module is compensated to be 2 xD 1 by calculating the difference value D1 between the actual received optical power value and the specified received optical power value, so that the gain of the optical end machine system is not influenced by the length of the optical fiber, and the system stability is improved.
In one embodiment, the ethernet communication circuit is designed using a Qualcomm Atheros AR7410 chip and AR1500 chip scheme. The design scheme has the advantages of low power consumption, high speed (the speed of a physical layer is 600Mbps, the bandwidth of a MAC layer is 340 Mbps), an embedded ARM11 CPU chip (the typical main frequency is 355 MHz), high receiving sensitivity (less than or equal to-90 dBm), advanced Turbo code forward error correction and the like. The broadband property of the existing optical device of the analog optical module is fully utilized, and data, voice and video are transmitted through an Ethernet protocol. The Ethernet optical transceiver module has the advantages of high bandwidth, high safety, good reliability, convenient management, simple maintenance and the like.
The main technical indexes are as follows:
(1) Operating frequency: 800-1000 MHz;
(2) Gain: not less than 10dB;
(3) Maximum input lossless level: not less than 20dBm;
(4) ALC control range: more than or equal to 25dB;
(5) Optical loss automatic gain compensation value: not less than 10dB (light loss);
(6) RF switch response time: < 10 μs;
(7) Isolation of the radio frequency switch: more than or equal to 50dB;
(8) RF transmit-receive isolation: not less than 65dB;
(9) Stray: less than or equal to-60 dBm/100kHz (9 kHz-12.75 GHz); harmonic wave: less than or equal to-45 dB;
(10) Bottom noise: less than or equal to-130 dBm/Hz;
(11) Input/output power detection range: more than or equal to 40dB;
(12) Working temperature range: -25 to +55℃.
The present invention has been described in terms of the preferred embodiments thereof, and it should be understood by those skilled in the art that various modifications can be made without departing from the principles of the invention, and such modifications should also be considered as being within the scope of the invention.
Claims (3)
1. The GSM-R repeater Ethernet single-fiber optical transceiver with optical loss automatic gain compensation is characterized in that: the device comprises an input radio frequency channel, an output radio frequency channel, wavelength division multiplexing equipment and an Ethernet communication circuit; the input radio frequency channel comprises a filter circuit, an ALC control circuit, a radio frequency switch circuit, an amplifying circuit, an attenuation circuit, a coupling circuit and a laser circuit which are sequentially connected, wherein the filter circuit is connected to a radio frequency signal input interface, and the laser circuit is connected to wavelength division multiplexing equipment; the output radio frequency channel comprises a light receiver, a coupling circuit, an amplifying circuit, an ATT automatic compensation circuit and a filter circuit which are sequentially connected, wherein the filter circuit is connected to a radio frequency signal output interface, the input frequency is 800 MHz-1000 MHz, and the light receiver is connected to wavelength division multiplexing equipment; the Ethernet communication circuit is respectively connected with the coupling circuits in the input radio frequency channel and the output radio frequency channel, and is provided with an Ethernet interface; the wavelength division multiplexing device is connected with the wavelength division multiplexing devices of the rest optical terminals through optical fibers or connected with a plurality of optical terminal modules through optical splitters.
2. The GSM-R repeater ethernet single fiber optical transceiver with optical loss automatic gain compensation according to claim 1, wherein: in the input radio frequency channel, the filter circuit is a band-pass filter circuit and a matching circuit, and the band-pass filter circuit suppresses out-of-band input signals and suppresses FSK frequency and Ethernet transmission frequency of the analog optical transceiver; the ALC control circuit is an analog level automatic control circuit and is used for automatically controlling according to the input power, and when the input signal is larger, the output signal is consistent; the radio frequency switch circuit is used for controlling the optical transceiver module to have no signal output when the signal is input; the amplifying circuit is a radio frequency amplifier circuit and is composed of one or a plurality of stages of amplifiers; the attenuation circuit is an input port, the gain of the optical transceiver can be manually adjusted, and the attenuation range is 0-31 dB; the coupling circuit couples the Ethernet data signal and the data transmission data FSK signal to the main radio frequency link of the optical transceiver, and the signals are converted into optical signals by the laser and transmitted by the optical fiber; the laser is an analog electro-optic conversion circuit.
3. The GSM-R repeater ethernet single fiber optical transceiver with optical loss automatic gain compensation according to claim 1, wherein: in the output radio frequency channel, the light receiver is an analog photoelectric conversion circuit; the coupling circuit receives an Ethernet data signal and a data transmission data FSK signal of an optical transceiver module of a terminal and the data transmission chip is coupled from a main radio frequency link to perform data processing; the amplifying circuit is a radio frequency amplifier circuit and is composed of one or a plurality of stages of amplifiers; the ATT automatic compensation circuit is used for realizing the automatic gain compensation function of the optical loss, and if the system is designed to compensate the 10dB optical loss, namely, when no optical loss exists, the attenuation value of the ATT attenuator is 20dB; once the loss of the optical path is D1, the ATT attenuation value automatically becomes (20-2 xD 1) dB; the filter circuit is a multi-order band-pass filter circuit and a matching circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611223800.5A CN106936502B (en) | 2016-12-27 | 2016-12-27 | GSM-R repeater Ethernet single-fiber optical transceiver with optical loss automatic gain compensation |
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| CN201611223800.5A CN106936502B (en) | 2016-12-27 | 2016-12-27 | GSM-R repeater Ethernet single-fiber optical transceiver with optical loss automatic gain compensation |
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| CN106936502B true CN106936502B (en) | 2024-02-13 |
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| CN101895337A (en) * | 2010-07-07 | 2010-11-24 | 东莞市铭普实业有限公司 | Double-fiber hot backup radio-frequency intelligent optical module |
| CN102045114A (en) * | 2010-12-31 | 2011-05-04 | 深圳市虹远通信有限责任公司 | Method for automatically compensating ascending optical loss gain and near end of optical fiber repeater |
| CN202503520U (en) * | 2011-12-30 | 2012-10-24 | 武汉烽火众智数字技术有限责任公司 | High-speed Ethernet optical module and radio-frequency data transmission device thereof |
| CN204231349U (en) * | 2014-07-08 | 2015-03-25 | 上海鑫众通信技术有限公司 | A kind of energy-saving optical fiber repeater |
| CN206490675U (en) * | 2016-12-27 | 2017-09-12 | 南京泰通科技股份有限公司 | GSM R repeaters Ethernet single fiber optical transmitter and receiver with light loss automatic gain compensation |
-
2016
- 2016-12-27 CN CN201611223800.5A patent/CN106936502B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895337A (en) * | 2010-07-07 | 2010-11-24 | 东莞市铭普实业有限公司 | Double-fiber hot backup radio-frequency intelligent optical module |
| CN102045114A (en) * | 2010-12-31 | 2011-05-04 | 深圳市虹远通信有限责任公司 | Method for automatically compensating ascending optical loss gain and near end of optical fiber repeater |
| CN202503520U (en) * | 2011-12-30 | 2012-10-24 | 武汉烽火众智数字技术有限责任公司 | High-speed Ethernet optical module and radio-frequency data transmission device thereof |
| CN204231349U (en) * | 2014-07-08 | 2015-03-25 | 上海鑫众通信技术有限公司 | A kind of energy-saving optical fiber repeater |
| CN206490675U (en) * | 2016-12-27 | 2017-09-12 | 南京泰通科技股份有限公司 | GSM R repeaters Ethernet single fiber optical transmitter and receiver with light loss automatic gain compensation |
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