CN202094897U - Long distance transmission system and transmit-receive device of low speed optical communication signal - Google Patents
Long distance transmission system and transmit-receive device of low speed optical communication signal Download PDFInfo
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- CN202094897U CN202094897U CN2010206933349U CN201020693334U CN202094897U CN 202094897 U CN202094897 U CN 202094897U CN 2010206933349 U CN2010206933349 U CN 2010206933349U CN 201020693334 U CN201020693334 U CN 201020693334U CN 202094897 U CN202094897 U CN 202094897U
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Abstract
The utility model provides a long distance transmission system and a transmit-receive device of low speed optical communication signals. The system comprises a signal transmitting device used for modulating low speed signals carrying information to high speed signals and transmitting the signals via a high speed optical module, a signal receiving device used for decoding the received high speed signals and recovering the high speed signals into the low speed signals carrying information and a fiber link arranged between the signal transmitting device and the signal receiving device and used for transmitting the high speed signals from the signal transmitting device to the signal receiving device. The system realizes long distance transmission of the low speed optical communication signals. Besides, the signal transmitting device and the signal receiving device are small in volume and low in cost, and are suitable for being applied to industrial control fields.
Description
[technical field]
The utility model relates to the optical communication technique field, especially relates to a kind of long haul transmission system of low speed communicate optical signal and transmission thereof, receiving system.
[background technology]
In recent years, communication and computer networking technology development are swift and violent, and wherein, opto-electronic device and microprocessor and high-speed electronic components have played vital impetus simultaneously.The advance of optical device, reliability and economy can directly have influence on the vitality and the market competitiveness of system equipment and even whole network.
At present, long haul communication can only transmission rate be the above signal of 2M with optical module, and is that 0 to 2M this Ultra-Low Speed signal can't realize growing Distance Transmission or volume is big, cost is high for speed.
[utility model content]
The technical problems to be solved in the utility model is, at the defective that low speed communicate optical signal transmission range is not far or cost is higher of prior art, provide the long haul transmission system of the low speed communicate optical signal that a kind of volume is less, price is lower and transmission thereof, receiving system.
In order to solve the problems of the technologies described above, the utility model provides a kind of long haul transmission system of low speed communicate optical signal, and described system comprises:
Be used for to have the sender unit that the low speed signal of information is modulated into high speed signal and sends by high-speed optical module;
Be used for the high speed signal that receives decoded and revert to the described signal receiving device that has the low speed signal of information; And
Be connected between sender unit, the signal receiving device, be used for described high speed signal is transferred to from sender unit the optical fiber link of signal receiving device.
Further, in above-mentioned long haul transmission system, described sender unit comprises:
Be used for the low speed signal of input is carried out the signal encoding module of sample code; And
Be connected in described signal encoding module, be used to produce the clock generating module of the clock signal of modulation.
Further, in above-mentioned long haul transmission system, described clock generating module adopts the clock frequency modulating input signal of 21M.
Further, in above-mentioned long haul transmission system, described clock generating module comprises an inverter, biasing resistor R, quartz crystal H and capacitor C, wherein, biasing resistor R, quartz crystal H all are parallel to input, the output of described inverter, and the input of described inverter also connects capacitor C and ground connection.
Further, in above-mentioned long haul transmission system, described signal receiving device comprises:
Be used for signal decoding module that the high speed signal that receives is decoded; And
Be connected in described signal decoding module, be used to the clock recovery module of the clock signal recovering to modulate.
Further, in above-mentioned long haul transmission system, described high-speed optical module is the TTL optical module of 84M.
The utility model also provides a kind of sender unit of low speed communicate optical signal, and described device comprises:
Be used for the low speed signal of input is carried out the signal encoding module of sample code; And
Be connected in described signal encoding module, be used to produce the clock generating module of the clock signal of modulation.
Further, in above-mentioned sender unit, described clock generating module comprises an inverter, biasing resistor R, quartz crystal H and capacitor C, wherein, biasing resistor R, quartz crystal H all are parallel to input, the output of described inverter, and the input of described inverter also connects capacitor C and ground connection.
The sender unit of the long haul transmission system of the utility model low speed communicate optical signal will have the asynchronous high speed signal that is modulated into of low speed signal of information, send by the high-speed optical module that can grow Distance Transmission again and be transferred to signal receiving device by optical fiber link, described signal receiving device is decoded to the high speed signal that receives and is reverted to the described low speed signal that has information, thereby realized the long Distance Transmission of low speed communicate optical signal, and described sender unit and signal receiving device volume are less, price is lower, very is adapted at the application of industrial control field.
[description of drawings]
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation of the long haul transmission system preferred embodiment of the utility model low speed communicate optical signal;
Fig. 2 is the circuit diagram of the clock generating module among Fig. 1.
[embodiment]
See also Fig. 1, Fig. 1 is the structural representation of the long haul transmission system preferred embodiment of the utility model low speed communicate optical signal.Described transmission system comprises sender unit 10, signal receiving device 20 and is connected in optical fiber link between sender unit 10, the signal receiving device 20.The low speed signal that sender unit 10 is used for having information is modulated into high speed signal and sends by high-speed optical module, described optical fiber link is used for described high speed signal is transferred to signal receiving device 20 from sender unit 10, and 20 pairs of high speed signals that receive of signal receiving device are decoded and reverted to the described low speed signal that has information.
The low speed signal of 10 pairs of inputs of sender unit of the utility model embodiment carries out sample code, makes it to be modulated into high speed signal, to realize the transmission of long distance.Sender unit 10 comprises signal encoding module 102 and clock generation module 104, wherein, signal encoding module 102 is used for the low speed signal of input is carried out sample code, clock generating module 104 is connected in signal encoding module 102, and clock generating module 104 is used to produce the clock signal of modulation.
Further, as an embodiment of the present utility model, the low speed signal of 102 pairs of inputs of signal encoding module of sender unit 10 carries out the CMI coding.Wherein, the CMI sign indicating number is the abbreviation of coded mark inverse code, and its coding rule is: at first will separately encode " 0 " in the pcm stream of coming and " 1 " sign indicating number respectively then.When input code was " 1 " sign indicating number, " 00 " and " 11 " sign indicating number alternately appearred in coding output; When input code was " 0 " sign indicating number, therefore coding output " 01 " sign indicating number can not occur connecting 0 more than 3.The advantage of CMI sign indicating number is not have DC component, and has and the waveform saltus step frequently occurs, is convenient to timing information and extracts, and has the error monitoring ability.And the volume of CMI sign indicating number, decoding circuit are simple, realize easily, are lower than in the fiber optical digital transmission system of 8448kb/s also as circuit transmission pattern commonly used in speed.
Further, as an embodiment of the present utility model, the clock generating module 104 of sender unit 10 adopts the clock frequency modulating input signal of 21M.In order to save the space, reduce power consumption, the clock generating module 104 usefulness quartz oscillators of present embodiment are realized.Under the alive outside effect of quartz crystal, it can produce a piezoelectric effect, and quartz crystal produces mechanical oscillation, when the frequency of applied voltage is identical with the crystal natural mode shape, the mechanical activation amplitude maximum of crystal, the alternating electric field of generation are also just maximum, form piezoelectric resonator.
See also Fig. 2, Fig. 2 is the circuit diagram of the clock generating module among Fig. 1.Clock generating module 104 comprises an inverter A, biasing resistor R, quartz crystal H and capacitor C, and wherein, biasing resistor R, quartz crystal H all are parallel to input, the output of inverter A, and the input of inverter A also connects capacitor C and ground connection.
20 pairs of high speed signals that receive of the signal receiving device of the utility model embodiment are decoded, and make it to revert to the described low speed signal that has information.Signal receiving device 20 comprises signal decoding module 202 and clock recovery module 204, wherein, signal decoding module 202 is used for the high speed signal that receives is decoded, and clock recovery module 204 is connected in signal decoding module 202, and clock recovery module 204 is used to the clock signal recovering to modulate.
Further, as an embodiment of the present utility model, the signal decoding module 202 of signal receiving device 20 is divided into high bit code and Low Level Code in twos with the CMI code stream that receives, and carries out the XOR judgement then, thereby obtains decoding output.
Further, as an embodiment of the present utility model, because can not transmit clock signal in the signals transmission, therefore need from the signal that receives, extract clock.Because the fundamental signal frequency that comprises in the signal is the signal clock frequency half, clock recovery module 204 at first converts the NRZ sign indicating number of received signal to the RZ sign indicating number by gate circuit, the formation frequency is that the pulse signal of 2 times of signal clock frequencies is sent in the crystal filter of 21M, at last the sine wave in crystal filter is sent into limiting amplifier, thereby recover the clock signal of modulation.
The course of work of the long haul transmission system of low speed communicate optical signal of the present utility model is as follows:
The low speed signal of 102 pairs of inputs of signal encoding module of sender unit 10 carries out CMI coding, and clock generating module 104 is modulated input signal with certain clock frequency simultaneously, obtains the high speed signal that can grow Distance Transmission; Described high speed signal is transferred to signal receiving device 20 by described optical fiber link, and in the present embodiment, described high speed signal is by the TTL optical module transmission of 84M, and the transmission range of 84M TTL optical module can reach 120KM, can realize long Distance Transmission; Signal receiving device 20 receives described high speed signal, 202 pairs of high speed signals of the signal decoding module of signal receiving device 20 are decoded, clock recovery module 204 extracts clock from the high speed signal that receives simultaneously, recovers the clock signal of modulation, thereby obtains having the low speed signal of information.
The sender unit of the long haul transmission system of the utility model low speed communicate optical signal will have the asynchronous high speed signal that is modulated into of low speed signal of information, send by the high-speed optical module that can grow Distance Transmission again and be transferred to signal receiving device by optical fiber link, described signal receiving device is decoded to the high speed signal that receives and is reverted to the described low speed signal that has information, thereby realized the long Distance Transmission of low speed communicate optical signal, and described sender unit and signal receiving device volume are less, price is lower, very is adapted at the application of industrial control field.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (9)
1. the long haul transmission system of a low speed communicate optical signal is characterized in that, described system comprises:
Be used for to have the sender unit that the low speed signal of information is modulated into high speed signal and sends by high-speed optical module;
Be used for the high speed signal that receives decoded and revert to the described signal receiving device that has the low speed signal of information;
Be connected between sender unit, the signal receiving device, be used for described high speed signal is transferred to from sender unit the optical fiber link of signal receiving device.
2. the long haul transmission system of low speed communicate optical signal according to claim 1 is characterized in that: described sender unit comprises:
Be used for the low speed signal of input is carried out the signal encoding module of sample code;
Be connected in described signal encoding module, be used to produce the clock generating module of the clock signal of modulation.
3. the long haul transmission system of low speed communicate optical signal according to claim 2 is characterized in that: described clock generating module adopts the clock frequency modulating input signal of 21M.
4. according to the long haul transmission system of claim 2 or 3 described low speed communicate optical signals, it is characterized in that: described clock generating module comprises an inverter, biasing resistor R, quartz crystal H and capacitor C, wherein, biasing resistor R, quartz crystal H all are parallel to input, the output of described inverter, and the input of described inverter also connects capacitor C and ground connection.
5. the long haul transmission system of low speed communicate optical signal according to claim 1 is characterized in that: described signal receiving device comprises:
Be used for signal decoding module that the high speed signal that receives is decoded; And be connected in described signal decoding module, be used to the clock recovery module of the clock signal recovering to modulate.
6. the long haul transmission system of low speed communicate optical signal according to claim 1 is characterized in that: described high-speed optical module is the TTL optical module of 84M.
7. the sender unit of a low speed communicate optical signal is characterized in that, described device comprises:
Be used for the low speed signal of input is carried out the signal encoding module of sample code; And be connected in described signal encoding module, be used to produce the clock generating module of the clock signal of modulation.
According to claim 7 fast sender unit, it is characterized in that: described clock generating module comprises an inverter, biasing resistor R, quartz crystal H and capacitor C, wherein, biasing resistor R, quartz crystal H all are parallel to input, the output of described inverter, and the input of described inverter also connects capacitor C and ground connection.
9. the signal receiving device of a low speed communicate optical signal is characterized in that, described device comprises:
Be used for signal decoding module that the high speed signal that receives is decoded;
Be connected in described signal decoding module, be used to the clock recovery module of the clock signal recovering to modulate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206933349U CN202094897U (en) | 2010-12-20 | 2010-12-20 | Long distance transmission system and transmit-receive device of low speed optical communication signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206933349U CN202094897U (en) | 2010-12-20 | 2010-12-20 | Long distance transmission system and transmit-receive device of low speed optical communication signal |
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| CN202094897U true CN202094897U (en) | 2011-12-28 |
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| CN2010206933349U Expired - Fee Related CN202094897U (en) | 2010-12-20 | 2010-12-20 | Long distance transmission system and transmit-receive device of low speed optical communication signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475415A (en) * | 2013-09-25 | 2013-12-25 | 武汉世翔科技有限公司 | Method for transmitting optical module low-speed signals |
| CN109150313A (en) * | 2018-08-15 | 2019-01-04 | 上海霍普光通信有限公司 | A kind of optical signal transmission method of low rate optical transmitter and receiver |
-
2010
- 2010-12-20 CN CN2010206933349U patent/CN202094897U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475415A (en) * | 2013-09-25 | 2013-12-25 | 武汉世翔科技有限公司 | Method for transmitting optical module low-speed signals |
| CN109150313A (en) * | 2018-08-15 | 2019-01-04 | 上海霍普光通信有限公司 | A kind of optical signal transmission method of low rate optical transmitter and receiver |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111228 Termination date: 20131220 |