CN206620136U - GSM R repeaters Ethernet double-fiber optical transmitter and receiver with light loss automatic gain compensation - Google Patents
GSM R repeaters Ethernet double-fiber optical transmitter and receiver with light loss automatic gain compensation Download PDFInfo
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- CN206620136U CN206620136U CN201621442893.6U CN201621442893U CN206620136U CN 206620136 U CN206620136 U CN 206620136U CN 201621442893 U CN201621442893 U CN 201621442893U CN 206620136 U CN206620136 U CN 206620136U
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Abstract
The utility model provides a kind of GSM R repeaters Ethernet double-fiber optical transmitter and receiver with light loss automatic gain compensation, including input radio frequency passage, two export radio-frequency channel, WDM and ethernet communication circuit.Input radio frequency passage includes filter circuit, ALC controls circuit, radio-frequency switch circuit, amplifying circuit, attenuator circuit, termination power and the laser circuit being sequentially connected；Every output radio-frequency channel includes light receiving device, termination power, amplifying circuit, ATT auto compensatng circuits and the filter circuit being sequentially connected；WDM is connected with the WDM of remaining optical transmitter and receiver by optical fiber or is connected multiple optical transmitter and receiver modules by optical branching device.The functionalization that the utility model is carried out on the basis of existing simulation optical transmitter and receiver is improved, and existing simulation optical transmitter and receiver is had light loss automatic gain compensation, and optical transmitter and receiver module supports active and standby fine redundancy communication mode.
Description
Technical field
The utility model is related to railway fiber optic communication field, specifically a kind of GSM-R with light loss automatic gain compensation
Repeater Ethernet double-fiber optical transmitter and receiver.
Background technology
It is one of key modules of GSM-R analog optical fibers repeater to simulate optical transmitter and receiver module, mainly by GSM-R radiofrequency signals
Optical signal is converted into, is transmitted by optical fiber.The signal that simulation optical transmitter and receiver is transmitted in a fiber is analog optical signal, its cost
Cheaply, it is the more commonly used.When carrying out data transmission, simulation optical transmitter and receiver is first modulated into baseband signal by the way of FSK radio frequency letter
Number, then transmitted after electrical-optical conversion, optical signal is passed to after receiving terminal, same to carry out optical-electronic conversion, then carries out FSK solutions
Adjust, recover data-signal.Simultaneously by using wavelength-division multiplex technique（WDM）.There are some shortcomings in this simulation optical transmitter and receiver：It is main
If transmission rate is low, anti-interference is poor, the need for being not suitable for the quick transmission of track traffic informix, hinders to a certain extent
The fast development of track traffic is hindered.Cover interval in railway tunnel feeble field, fiber resource is very limited, according to conventional light
Terminal module, GSM-R analog optical fibers repeater can not realize the transmitted in both directions of image and data-signal, it is impossible to for railway communication electricity
Source, environmental monitoring system, emergency communication and video monitoring provide data transmission channel.Using the simulated light of ethernet communication function
Terminal is come to substitute conventional optical transmitter and receiver module be necessary, and the method can not only reduce fiber resource, moreover it is possible to engineering is greatly lowered
Cost.
In addition, simulating repeater in engineer applied by optical fiber effect length, cause direct discharging station gain inconsistent, with
The gain inequality of the nearest remote termination of repeater near-end machine and a farthest remote termination may reach 10~20dB, equivalent to most
A remote remote termination 10~20km more than a nearest remote termination fiber lengths.Therefore need straight with light loss automatic compensation function
Station equipment is put to reduce engineering design, using difficulty, direct discharging station stability is improved.
Utility model content
There is provided a kind of GSM- with light loss automatic gain compensation in order to solve problem of the prior art for the utility model
R repeaters Ethernet double-fiber optical transmitter and receiver, the functionalization carried out on the basis of existing simulation optical transmitter and receiver is improved, and makes existing simulated light
Terminal has light loss automatic gain compensation, and optical transmitter and receiver module supports active and standby fine redundancy communication mode.
The utility model exports radio-frequency channel, WDM and Ethernet including an input radio frequency passage, two
Telecommunication circuit.
Input radio frequency passage include be sequentially connected filter circuit, ALC control circuit, radio-frequency switch circuit, amplifying circuit,
Decay（ATT）Circuit, termination power and laser circuit, wherein, filter circuit is connected to radiofrequency signal input interface, input frequency
Rate 800MHz~1000MHz, laser circuit is connected to WDM；
Two output radio-frequency channels include main output radio-frequency channel and standby output radio-frequency channel, every output radio-frequency channel
Including the light receiving device being sequentially connected, termination power, amplifying circuit, ATT auto compensatng circuits and filter circuit, wherein filter circuit
Radiofrequency signal output interface is connected to, light receiving device is connected to WDM, the light receiving device and coupling of two output radio-frequency channels
Close circuit and be all connected to switching circuit, the main output radio-frequency channel of switching circuit acquiescence connection, when main output radio-frequency channel exist it is different
Chang Shi, automatically switches to standby output radio-frequency channel；
Ethernet communication circuit is connected respectively at input radio frequency passage with the termination power in output radio-frequency channel, Ethernet
Telecommunication circuit is provided with Ethernet interface；
WDM include main WDM and standby WDM, wherein main WDM with
Main output radio-frequency channel connection, is connected or by optical branching device by primary optical fiber with the main WDM of remaining optical transmitter and receiver
Connect multiple optical transmitter and receiver modules；Standby WDM is connected with standby output radio-frequency channel, passes through spare fibre and remaining
Standby point of multiplexing equipment of optical transmitter and receiver is connected or connects multiple optical transmitter and receiver modules by optical branching device.
In described input radio frequency passage, filter circuit is band pass filter circuit and match circuit, bandwidth-limited circuit
Suppress out of band input signal, soldier suppresses the FSK frequencies of simulation optical transmitter and receiver in itself（430~440MHz）With Ethernet transmission frequency
（7.5~65MHz）；ALC controls circuit to be analog level automatic control circuit, is automatically controlled according to input power size,
Output signal is consistent when input signal is bigger than normal；No signal when radio-frequency switch circuit has signal input for control optical transmitter and receiver module
Output；Amplifying circuit is radio-frequency amplifier circuit, is constituted using one-level or some grades of amplifiers；Attenuator circuit is that input port can
Regulation optical transmitter and receiver gain manually, attenuation range is 0~31dB；Ethernet data signal, number are passed data fsk signal by termination power
Coupled in optical transmitter and receiver main radio frequency link, the transmission of optical signals optical fiber is converted into by laser；Laser is simulation electro-optic conversion
Circuit.
In described output radio-frequency channel, light receiving device is analog photoelectricity change-over circuit；Termination power receiving terminal optical transmitter and receiver mould
The ethernet circuit sum of block passes chip and the biography data fsk signal progress of Ethernet data signal sum is coupled from main radio frequency link
Data processing；Amplifying circuit is radio-frequency amplifier circuit, is constituted using one-level or some grades of amplifiers；ATT auto compensatng circuits
To realize light loss automatic gain compensation function, if system design compensates 10dB light losses, i.e., when without light loss, ATT attenuator pad values
For 20dB；Once lossy light path is D1（Calculate the difference of actual received optical power value and defined received optical power value）, ATT
Pad value automatically becomes（20-2×D1）dB；Filter circuit is multistage bandwidth-limited circuit and match circuit, it is ensured that output port
Spuious index and voltage standing wave(VSW) ratio meet use requirement；Two output radio-frequency channels by combiner be combined after after filtering
Circuit output.
The utility model beneficial effect is：
1. supporting 200MHz broadband operations, operating frequency range is 800MHz~1000MHz；
2. optical transmitter and receiver module has light loss automatic gain compensation function：Possess >=10dB light losses compensation ability, it is ensured that light
Terminal system gain improves the stability of a system not by optical fiber effect length.
3. compatible original conventional simulation optical transmitter and receiver modular structure size, increases ethernet communication circuit using inside, has
100Mbps and the ability of above Ethernet data transmission；
4. with double redundant optical fiber backup functionalitys：Optical transmitter and receiver module supports active and standby fine redundancy communication mode, gives tacit consent to work
Based on use optical fiber, once primary optical fiber disconnection after received optical power it is less than normal when, automatically switch to spare fibre link.
5. with Ethernet interface communication interface：Ethernet interface for direct discharging station provide 100Mbps speed with
Too net high speed transparent transmission ability, is that power supply of railway communication system, environmental monitoring system, emergency communication and video monitoring etc. provide data transfer
Passage, this Ethernet pass-through channel does not influence repeater near-end machine and remote termination proper communication when working；
6. the input and output port of optical transmitter and receiver module is spuious low, it is ensured that the performance indications requirement of repeater equipment
7. spuious index request：≤ -60dBm/100kHz（9kHz~12.75GHz）；Harmonic wave：≤-45dBm；
8. optical transmitter and receiver module has ALC automatic level control functions：- 20~+5dBm of ALC control ranges（It is not limited to）,
ALC adjusts step-length ± 1dB, when this function ensures that input power is bigger than normal, and power output keeps constant, and ensure intermodulation index not because
Input power is excessive and deteriorates；
9. optical transmitter and receiver module supports the power detection ability of wide scope：Input power is detected and power output detection range
≥40dB；This power can monitor the input power and power output of optical module, be that direct discharging station regular maintenance or maintenance are looked into
Problem is looked for bring convenient.
10. optical transmitter and receiver module has RF switch function：Switch isolation degree >=50dB, in direct discharging station, using many
Individual optical module constitutes redundancy backup passage, and alternate channel can be by closing RF switch, it is ensured that standby passage no signal passes through, and carries
For system reliability and stability；
11. any optical transmitter and receiver can be with several different wave length optical transmitter and receiver modules：The optical module of repeater near-end machine can be propped up
Hold the optical module for connecting several repeater remote terminations, i.e. optical module and support 1 many-to-many communication；
12. with temperature compensation function：Ensure environment in -25 DEG C~+55 DEG C, gain stability≤± 1dB, stable output power
Degree（Tested when ALC is started to control）≤ ± 1dB, optical output power stability≤± 1dB；
13. with RS485 and：This optical transmitter and receiver module supports two kinds of communication interfaces, and RS485 communication interfaces are used for optical transmitter and receiver sheet
Body data communication and the communication of low speed serial ports transparent transmission（For repeater near-end machine and remote termination low rate communication）.
Brief description of the drawings
Fig. 1 is the utility model structural representation.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
The utility model circuit structure is as shown in figure 1, including an input radio frequency passage, two output radio-frequency channels, ripples
Divide multiplexing equipment and ethernet communication circuit.
Input radio frequency passage include be sequentially connected filter circuit, ALC control circuit, radio-frequency switch circuit, amplifying circuit,
Decay（ATT）Circuit, termination power and laser circuit, wherein, filter circuit is connected to radiofrequency signal input interface, input frequency
Rate 800MHz~1000MHz, laser circuit is connected to WDM；
Two output radio-frequency channels include main output radio-frequency channel and standby output radio-frequency channel, every output radio-frequency channel
Including the light receiving device being sequentially connected, termination power, amplifying circuit, ATT auto compensatng circuits and filter circuit, wherein filter circuit
Radiofrequency signal output interface is connected to, light receiving device is connected to WDM, the light receiving device and coupling of two output radio-frequency channels
Close circuit and be all connected to switching circuit, the main output radio-frequency channel of switching circuit acquiescence connection, when main output radio-frequency channel exist it is different
Chang Shi, automatically switches to standby output radio-frequency channel；
Ethernet communication circuit is connected respectively at input radio frequency passage with the termination power in output radio-frequency channel, Ethernet
Telecommunication circuit is provided with Ethernet interface；
WDM include main WDM and standby WDM, wherein main WDM with
Main output radio-frequency channel connection, is connected or by optical branching device by primary optical fiber with the main WDM of remaining optical transmitter and receiver
Connect multiple optical transmitter and receiver modules；Standby WDM is connected with standby output radio-frequency channel, passes through spare fibre and remaining
Standby point of multiplexing equipment of optical transmitter and receiver is connected or connects multiple optical transmitter and receiver modules by optical branching device.
In described input radio frequency passage, filter circuit is band pass filter circuit and match circuit, bandwidth-limited circuit
Suppress out of band input signal, soldier suppresses the FSK frequencies of simulation optical transmitter and receiver in itself（430~440MHz）With Ethernet transmission frequency
（7.5~65MHz）；ALC controls circuit to be analog level automatic control circuit, is automatically controlled according to input power size,
Output signal is consistent when input signal is bigger than normal；No signal when radio-frequency switch circuit has signal input for control optical transmitter and receiver module
Output；Amplifying circuit is radio-frequency amplifier circuit, is constituted using one-level or some grades of amplifiers；Attenuator circuit is that input port can
Regulation optical transmitter and receiver gain manually, attenuation range is 0~31dB；Ethernet data signal, number are passed data fsk signal by termination power
Coupled in optical transmitter and receiver main radio frequency link, the transmission of optical signals optical fiber is converted into by laser；Laser is simulation electro-optic conversion
Circuit.
In described output radio-frequency channel, light receiving device is analog photoelectricity change-over circuit；Termination power receiving terminal optical transmitter and receiver mould
The ethernet circuit sum of block passes chip and the biography data fsk signal progress of Ethernet data signal sum is coupled from main radio frequency link
Data processing；Amplifying circuit is radio-frequency amplifier circuit, is constituted using one-level or some grades of amplifiers；ATT auto compensatng circuits
To realize light loss automatic gain compensation function, if system design compensates 10dB light losses, i.e., when without light loss, ATT attenuator pad values
For 20dB；Once lossy light path is D1（Calculate the difference of actual received optical power value and defined received optical power value）, ATT
Pad value automatically becomes（20-2×D1）dB；Filter circuit is multistage bandwidth-limited circuit and match circuit, it is ensured that output port
Spuious index and voltage standing wave(VSW) ratio meet use requirement；Two output radio-frequency channels by combiner be combined after after filtering
Circuit output.
Optical transmitter and receiver module automatic gain compensation function：Simulate optical module in use, the light loss of optical fiber is to optical module
Gain have certain loss i.e. 1dB light losses be equal to RF signal gain reduce 2dB, in Practical Project in use, optical fiber is long
Degree is uncertain, so during simulation repeater many remote terminations of near-end machine band, reaching the radiofrequency signal of every remote termination not
Unanimously, system gain disunity, is likely to result in the phenomenons such as speech quality difference, it is to avoid this phenomenon is produced, this simulation optical transmitter and receiver module
Gain Automatic compensation function is supported, by calculating the difference D1 of actual received optical power value and defined received optical power value, is mended
The gain for repaying optical transmitter and receiver module is 2 × D1, it is ensured that optical transceiver system gain improves the stability of a system not by optical fiber effect length.
A kind of embodiment, ethernet communication circuit using Qualcomm Atheros AR7410 chips with
AR1500 chip solutions are designed.Present design has low-power consumption, speed high（Physical layer rate：600Mbps, MAC layer bandwidth：
340Mbps）, embedded ARM11 cpu chips（Typical dominant frequency 355MHz）, receiving sensitivity it is high（≤-90dBm）, advanced Turbo
The advantages of code forward error correction is corrected.The broadband property of the simulation existing optical device of optical module is taken full advantage of, data, voice is realized, regards
Frequency be transmitted by Ethernet protocol.The Ethernet optical transmitter and receiver module have high, safe bandwidth, good reliability,
Many advantages, such as managing convenience, safeguard simple.
The key technical indexes：
（1）Working frequency：800~1000MHz；
（2）Gain：≥10dB；
（3）Maximum input nondestructive level：≥20dBm；
（4）ALC control ranges：≥25dB；
（5）RF switchs the response time：The μ s of ＜ 10；
（6）RF switch isolation：≥50dB；
（7）RF receive-transmit isolations：≥65dB；
（8）It is spuious：≤ -60dBm/100kHz（9kHz~12.75GHz）；Harmonic wave：≤-45dB；
（9）Back noise：≤-130dBm/Hz；
（10）Input/output power detection scope：≥40dB；
（11）Input/output standing-wave ratio：≤1.4；
（12）Active and standby optical-fibre channel switching time：≤2s；
（13）Operating temperature range：- 25 DEG C~+55 DEG C.
The utility model concrete application approach is a lot, and described above is only preferred embodiment of the present utility model, should
Point out, for those skilled in the art, on the premise of the utility model principle is not departed from, can also make
Go out some improvement, these improvement also should be regarded as protection domain of the present utility model.
Claims (3)
1. a kind of GSM-R repeaters Ethernet double-fiber optical transmitter and receiver with light loss automatic gain compensation, it is characterised in that：Including one
Bar input radio frequency passage, two output radio-frequency channels, WDM and ethernet communication circuits；
Filter circuit, the ALC that input radio frequency passage includes being sequentially connected control circuit, radio-frequency switch circuit, amplifying circuit, decay
Circuit, termination power and laser circuit, wherein, filter circuit is connected to radiofrequency signal input interface, incoming frequency 800MHz
~1000MHz, laser circuit is connected to WDM；
Two output radio-frequency channels include main output radio-frequency channel and standby output radio-frequency channel, and every output radio-frequency channel includes
Light receiving device, termination power, amplifying circuit, ATT auto compensatng circuits and the filter circuit being sequentially connected, wherein filter circuit are connected
To radiofrequency signal output interface, light receiving device is connected to WDM, the light receiving device and coupling electricity of two output radio-frequency channels
Road is all connected to switching circuit, and switching circuit acquiescence connects main output radio-frequency channel, when main output radio-frequency channel has exception,
Automatically switch to standby output radio-frequency channel；
Ethernet communication circuit is connected respectively at input radio frequency passage with the termination power in output radio-frequency channel, ethernet communication
Circuit is provided with Ethernet interface；
WDM includes main WDM and standby WDM, wherein main WDM and master are defeated
Go out radio-frequency channel connection, be connected by primary optical fiber with the main WDM of remaining optical transmitter and receiver or be connected by optical branching device
Multiple optical transmitter and receiver modules；Standby WDM is connected with standby output radio-frequency channel, passes through spare fibre and its remaining light end
Standby point of multiplexing equipment of machine is connected or connects multiple optical transmitter and receiver modules by optical branching device.
2. the GSM-R repeaters Ethernet double-fiber optical transmitter and receiver according to claim 1 with light loss automatic gain compensation, its
It is characterised by：In described input radio frequency passage, filter circuit is band pass filter circuit and match circuit, bandwidth-limited circuit
Suppress out of band input signal, soldier suppresses the FSK frequencies and Ethernet transmission frequency of simulation optical transmitter and receiver in itself；ALC controls the circuit to be
Analog level automatic control circuit, is automatically controlled according to input power size, and output signal is kept when input signal is bigger than normal
Unanimously；No signal is exported when radio-frequency switch circuit has signal input for control optical transmitter and receiver module；Amplifying circuit is radio frequency amplifier
Circuit, is constituted using one-level or some grades of amplifiers；Attenuator circuit is the manually adjustable optical transmitter and receiver gain of input port, model of decaying
Enclose for 0~31dB；Ethernet data signal, number are passed data fsk signal and are coupled in optical transmitter and receiver main radio frequency link by termination power,
The transmission of optical signals optical fiber is converted into by laser；Laser is simulation electro-optical conversion circuit.
3. the GSM-R repeaters Ethernet double-fiber optical transmitter and receiver according to claim 1 with light loss automatic gain compensation, its
It is characterised by：In described output radio-frequency channel, light receiving device is analog photoelectricity change-over circuit；Termination power receiving terminal optical transmitter and receiver mould
The ethernet circuit sum of block passes chip and the biography data fsk signal progress of Ethernet data signal sum is coupled from main radio frequency link
Data processing；Amplifying circuit is radio-frequency amplifier circuit, is constituted using one-level or some grades of amplifiers；ATT auto compensatng circuits
To realize light loss automatic gain compensation function, if system design compensates 10dB light losses, i.e., when without light loss, ATT attenuator pad values
For 20dB；Once lossy light path is D1, ATT pad values automatically become（20-2×D1）dB；Filter circuit is filtered for multistage band logical
Wave circuit and match circuit；Two output radio-frequency channels by combiner be combined after exported by filter circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621442893.6U CN206620136U (en) | 2016-12-27 | 2016-12-27 | GSM R repeaters Ethernet double-fiber optical transmitter and receiver with light loss automatic gain compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621442893.6U CN206620136U (en) | 2016-12-27 | 2016-12-27 | GSM R repeaters Ethernet double-fiber optical transmitter and receiver with light loss automatic gain compensation |
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| Publication Number | Publication Date |
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| CN206620136U true CN206620136U (en) | 2017-11-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656339A (en) * | 2016-12-27 | 2017-05-10 | 南京泰通科技股份有限公司 | GSM-R repeater Ethernet double-fiber optical transmitter/receiver with an optical loss automatic gain compensation function |
-
2016
- 2016-12-27 CN CN201621442893.6U patent/CN206620136U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656339A (en) * | 2016-12-27 | 2017-05-10 | 南京泰通科技股份有限公司 | GSM-R repeater Ethernet double-fiber optical transmitter/receiver with an optical loss automatic gain compensation function |
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