CN105162546A - Code pattern generation system applied to photoelectric communication - Google Patents
Code pattern generation system applied to photoelectric communication Download PDFInfo
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- CN105162546A CN105162546A CN201510612542.9A CN201510612542A CN105162546A CN 105162546 A CN105162546 A CN 105162546A CN 201510612542 A CN201510612542 A CN 201510612542A CN 105162546 A CN105162546 A CN 105162546A
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Abstract
The invention discloses a code pattern generation system applied to photoelectric communication. The code pattern generation system comprises a control signal decoder, a code pattern generator and a GTP firm core, wherein the control signal decoder is connected with the code pattern generator; the code pattern generator is connected with the GTP firm core; a counter system, a data packet encapsulation state machine, a PRBS (Pseudo Random Binary Sequence) generator, a packet header generator and a logic gate circuit are arranged in the code pattern generator; the logic gate circuit is connected with the GTP firm core; the logic gate circuit is connected with the PRBS generator and the packet header generator respectively; the data packet encapsulation state machine is connected with the counter system, the PRBS generator and the packet header generator respectively; a protective counter and a Tx counter are arranged in the counter system; and the data packet encapsulation state machine is connected with the protective counter and the Tx counter respectively. Two paths of high-speed time division multiplexed signals having the characteristics of GPON (Gigabit Passive Optical Network) uplink data packets can be generated. Through adoption of a scientific design concept and a reasonable design mode, required code signals can be generated rapidly and effectively.
Description
Technical field
The present invention relates to technical field of photo communication, specifically, is a kind of pattern generation system being applied to photoelectric communication.
Background technology
Laser is the most perfect light source of optical communication.Now, multiple laser can be produced, the laser of multiple power and wavelength can be produced.
Due to the luminescence phenomenon that laser is based on the light amplification of stimulated radiation, compare with the ordinary light source based on spontaneous radiation, there is many salient features.
1. monochromaticjty is good
We know, the light of different colours has different wavelength.So-called monochromatic light, actual is one section of radiation that wave-length coverage is very little.Breadth of spectrum line narrower (namely wave-length coverage is less), the monochromaticjty of light is better.It should be noted that, breadth of spectrum line is here the wave-length coverage that unmodulated front laser comprises, and it and the frequency bandwidth after Laser Modulation are two different concepts.Breadth of spectrum line before modulation is narrower, and the frequency bandwidth that can effectively utilize after modulation is wider.
Because laser is the stimulated radiation produced realize population inversion between particular level after, again through the frequency-selecting effect of resonant cavity, make its breadth of spectrum line exporting light very little, namely there is good monochromaticjty.
Utilize the monochromaticjty of laser good, spectral resolution is high, can be used to the research energy level of material and the fine structure of spectrum, makes error in a year and be no more than the regulator of a microsecond.
2. good directionality
The angle of divergence that we use up usually is to describe its directivity, and the angle of divergence is less, and directivity is better.Searchlight best in ordinary light source, its angle of divergence is 0.1rad (radian).If it is irradiated to (this is actual is impossible) on the moon of 400,000 kilometers, liftoff ball, its spot diameter has several ten thousand kilometers.In the laser, because the direction of excited atom luminescence is identical with ambient light, add resonant cavity and only allow to be amplified along the light of axis propagation, make the directivity of Output of laser fine, the angle of divergence can reach 10rad, and it is irradiated on the moon, and spot diameter is less than 2km.Utilize the good directionality of laser, can be used for range finding, location, navigation etc.
3. brightness is high
Because laser can accomplish interrupted luminescence, can run up to and to a certain degree happen suddenly out again, thus there is very high power, maximumly reach 10W, add the good directionality of laser, make its brightness high, also exceed more than one hundred billion doubly than the brightness of the sun, only have the strong flash of light of h-bomb blast moment could by comparison.Utilize the high brightness of laser, the high temperature of more than 100,000 degree can be produced at subrange, carry out punching, weld, perform the operation and controllable thermonuclear reaction etc.
4. coherence is good
So-called coherence refers to that two-beam can interfere, and forms the characteristic of stable light and dark interference image.The light sent due to stimulated radiation atom is all the same with external photon in frequency, position phase, direction of vibration etc., makes laser have good coherence and is comparatively close to desirable, completely relevant electromagnetic wave.O.1m the coherence length that general monochromatic source sends light is no more than, but the coherence length of laser can reach tens kilometers.Here coherence length refers to and light beam is divided into two bundles, allows them through different distances, can produce the maximum optical path difference of interference.Utilize the coherence of laser good, can holography be carried out, carry out accurate measurement.
Modern optical networking main line length general longer (more than tens kilometers), and transmission channel is more, from mass of system, reliability, and each side is considered economically, all should select amplitude modulation fibre system.
Britain nationality scholars Gao Kun (C.K.KA) of Chinese origin in 1966 and mother Huo Keha (C.K.HOCKHAM) have delivered the paper about transmission medium new ideas, indicate the possibility and the technological approaches that utilize optical fiber (OpticalFiber) to carry out information transmission, established Modern optical communication---the basis of optical fiber communication.1970, optical fiber development achieved important breakthrough, and the light source simultaneously as optical fiber communication also achieves substantial progress.Due to the technological progress of optical fiber and semiconductor laser, it is the important milestone becoming optical fiber communication development for 1970.1976, the U.S. carried out the field experiment of first practical optical fiber telecommunications system in the world at Atlanta (ATLANTA), and system adopts GAALAS laser as light source, and multimode fiber does transmission medium, and speed is 44.7Mb/s, and transmission range is about 10km.The field experiment that U.S. Atlanta in 1976 is carried out, indicates the stage that optical fiber communication is applied from base growth to business.After this, Fibre Optical Communication Technology development: optical fiber develops into single mode from multimode, operation wavelength develops into 1.31 and 1.55um from 0.85um, and transmission rate develops into tens from tens.On the other hand, along with the progress of technology and the formation of extensive industry, optical fiber price constantly declines, range of application constantly expands: extend to user access networks further from being relayed to long distance line between the Local Exchange at initial stage, from digital telephone to cable TV (CATV), from the transmission being transferred to multiple business of single type information.Current optical fiber has become the main medium in information broadband, and optical fiber telecommunications system will become the pillar of following national basis facility.
The birth of optical fiber communication and development are the technology that once important revolution in telecommunication history and satellite communication, mobile communication are listed as the nineties in 20th century.After entering 21 century, due to the growth of developing rapidly of internet service and audio frequency, video, data, multimedia application, there is more urgent demand to Large Copacity (ultrahigh speed and extra long distance) lightwave transmission system and network.
Optical fiber communication utilizes light wave exactly as carrier wave to transmit information, and realizes information transmission using optical fiber as transmission medium, reaches the communication objective up-to-date communication technology of one.
The evolution of communication improves constantly carrier frequency to expand the process of message capacity, optical frequency has reached the upper limit of communication carrier as carrier frequency, because only a kind of electromagnetic wave of very high frequency, therefore use up that to carry out message capacity as carrier wave very big, it is 1,100 times of communication mode in the past, have great attraction, optical communication is the target that people pursue for a long time, is also the inevitable direction of Communication Development.
Optical fiber communication is compared with electrical communication in the past, and the main distinction is to have many good qualities: its transmission frequency bandwidth, message capacity are large; Loss is low, repeater span is long; Wire diameter is thin, lightweight, and raw material is quartz, saves metal material, is conducive to resource reasonable employment; Insulation, electromagnetism interference performance is strong; Also have that resistance to corrosion is strong, capability of resistance to radiation is strong, reelability is good, without electric spark, reveal the advantages such as little, strong security, can use in particular surroundings or military affairs.
The application of optical fiber communication is very widely, is mainly used in local telephone network trunk line, and the advantage of optical fiber communication here can give full play to, and progressively replaces cable, is used widely.Also main by cable, microwave, satellite communication in the past for long distance line communication, existing progressively to use optical fiber communication and to define the bit transfer method accounting for global advantage; For the public telecommunication network (branch line as below the country-level main line of China, each province's secondary main line and county) of global communication network, various countries; It also for the television transmission of high-quality colour, industrial site monitors and scheduling, traffic monitoring control commander, cities and towns cable television network, common antenna (CATV) system, for fiber optic local area network and other as in aircraft, in airship, in naval vessels, under mine, power department, military affairs and have corrosion and have the middle uses such as radiation.
Passive optical network PON is applied to scale in a network with the advantage of its uniqueness.Because GPON system bandwidth availability ratio in existing PON system is the highest, system cost is minimum, and has full-service tenability, and therefore its prospect is generally had an optimistic view of, and becomes the broadband access technology of numerous telecom operators and equipment manufacturers' high praise.
In GPON, downlink data sends with the forms of broadcasting, and the packet that upstream data is sent by the mode of time division multiple access by multiple user terminal forms.Because transmission path is different, each data are surrounded by differential declines, and different pieces of information bag phasetophase exists saltus step, and there is long even " 1 ", " 0 " in packet, the signal that the impact of these factors makes OLT burst reception module receive is special burst luminous signal.For up burst, OLT burst reception module not only therefrom will recover the equal signal of amplitude, and to SPA sudden phase anomalies be eliminated, namely complete the alignment of clock and phase place, the signal that therefore OLT exports should be the equal and signal of telecommunication of clock and phase alignment of amplitude.The effect of this burst mode code error tester is, judges that the amplitude that completes of tested OLT burst reception module recovers response time and its reliability exactly.
Summary of the invention
The object of the present invention is to provide a kind of pattern generation system being applied to photoelectric communication; two-way time multiplexing signal at a high speed can be produced; this two paths of signals has feature (32 guard times of GPON upstream data bag; 44 lead codes; 20 delimiters); the design concept of its science, rational Design Mode, can generate required coded signal fast and effectively.
The present invention is achieved through the following technical solutions: a kind of pattern generation system being applied to photoelectric communication, comprise the solid core of control signal decoder, pattern generator and GTP, described control signal decoder connects pattern generator, and described pattern generator connects the solid core of GTP.
Further to better implement the present invention, special employing is following arranges structure: be provided with counter system, packet encapsulation state machine, PRBS generator, data packet head generator and logic gates in described pattern generator, described logic gates connects the solid core of GTP, described logic gates connects PRBS generator and data packet head generator respectively, and described packet encapsulation state machine is linkage counter system, PRBS generator and data packet head generator respectively.
Further to better implement the present invention, special employing is following arranges structure: be provided with protection counter and Tx counter in described counter system, described packet encapsulation state machine connects protection counter and Tx counter respectively.
Further to better implement the present invention, special employing is following arranges structure: described Tx counter comprises Tx0 counter and Tx1 counter, described Tx0 counter and Tx1 counter all connection packet encapsulation state machines.
Further to better implement the present invention, special employing is following arranges structure: the solid core of described GTP comprises GTP1 and GTP0, and described logic gates connects GTP1 and GTP0 respectively.
Further to better implement the present invention, the following set-up mode of special employing: the input signal of described control signal decoder is 32 bit wide data-signals.
The present invention compared with prior art, has the following advantages and beneficial effect:
The present invention can produce two-way time multiplexing signal at a high speed, and this two paths of signals has feature (32 guard times, 44 lead codes of GPON upstream data bag; 20 delimiters); the design concept of its science, rational Design Mode, can generate required coded signal fast and effectively.
Accompanying drawing explanation
Fig. 1 is fundamental diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1:
A kind of pattern generation system being applied to photoelectric communication; two-way time multiplexing signal at a high speed can be produced; this two paths of signals has feature (32 guard times of GPON upstream data bag; 44 lead codes; 20 delimiters); the design concept of its science; rational Design Mode; required coded signal can be generated fast and effectively; as shown in Figure 1; be provided with following structure especially: comprise the solid core of control signal decoder, pattern generator and GTP, described control signal decoder connects pattern generator, described pattern generator connects the solid core of GTP.
Embodiment 2:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, special employing is following arranges structure: be provided with counter system, packet encapsulation state machine, PRBS generator, data packet head generator and logic gates in described pattern generator, described logic gates connects the solid core of GTP, described logic gates connects PRBS generator and data packet head generator respectively, and described packet encapsulation state machine is linkage counter system, PRBS generator and data packet head generator respectively.
Embodiment 3:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, special employing is following arranges structure: be provided with protection counter and Tx counter in described counter system, and described packet encapsulation state machine connects protection counter and Tx counter respectively.
Embodiment 4:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, special employing is following arranges structure: described Tx counter comprises Tx0 counter and Tx1 counter, described Tx0 counter and Tx1 counter all connection packet encapsulation state machines.
Embodiment 5:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, as shown in Figure 1, special employing is following arranges structure: the solid core of described GTP comprises GTP1 and GTP0, and described logic gates connects GTP1 and GTP0 respectively.
Embodiment 6:
The present embodiment is at the enterprising one-step optimization in the basis of above-described embodiment, further to better implement the present invention, and the following set-up mode of special employing: the input signal of described control signal decoder is 32 bit wide data-signals.
The address information that control signal decoder is inputted by GPIO_IN according to connected Microblaze microprocessor, by control information (32 bit wide data-signal) assignment to the corresponding control signal of error code testing logic module.Control information mainly comprises: the control information etc. of the DRP address of packet length, guard time length, preamble length, code selection, GTP attribute and value, clock synthesis chip.
GTP0 and GTPl is solid nuclear component.The parallel data txdatal of 8 bit widths of low speed and txdata2 string is turned to 1 tunnel serial data at a high speed by it, when embody rule, can be changed the speed sending data by the DRP attribute revising GTP; GTP is also responsible for providing synchronised clock.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.
Claims (6)
1. be applied to a pattern generation system for photoelectric communication, it is characterized in that: comprise the solid core of control signal decoder, pattern generator and GTP, described control signal decoder connects pattern generator, described pattern generator connects the solid core of GTP.
2. a kind of pattern generation system being applied to photoelectric communication according to claim 1, it is characterized in that: in described pattern generator, be provided with counter system, packet encapsulation state machine, PRBS generator, data packet head generator and logic gates, described logic gates connects the solid core of GTP, described logic gates connects PRBS generator and data packet head generator respectively, and described packet encapsulation state machine is linkage counter system, PRBS generator and data packet head generator respectively.
3. a kind of pattern generation system being applied to photoelectric communication according to claim 2, is characterized in that: be provided with protection counter and Tx counter in described counter system, and described packet encapsulation state machine connects protection counter and Tx counter respectively.
4. a kind of pattern generation system being applied to photoelectric communication according to claim 3, is characterized in that: described Tx counter comprises Tx0 counter and Tx1 counter, described Tx0 counter and Tx1 counter all connection packet encapsulation state machines.
5. a kind of pattern generation system being applied to photoelectric communication according to claim 4, is characterized in that: the solid core of described GTP comprises GTP1 and GTP0, and described logic gates connects GTP1 and GTP0 respectively.
6. a kind of pattern generation system being applied to photoelectric communication according to claim 5, is characterized in that: the input signal of described control signal decoder is 32 bit wide data-signals.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098102A (en) * | 2011-02-15 | 2011-06-15 | 武汉电信器件有限公司 | Burst mode code error tester of optical module on optical line terminal in gigabit-capable passive optical network |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098102A (en) * | 2011-02-15 | 2011-06-15 | 武汉电信器件有限公司 | Burst mode code error tester of optical module on optical line terminal in gigabit-capable passive optical network |
Non-Patent Citations (3)
| Title |
|---|
| 孙磊君: "基于FPGA的高速突发模式误码测试系统的设计与实现", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
| 孙磊君等: "高速突发模式误码测试仪的FPGA 实现方案", 《单片机与嵌入式系统应用》 * |
| 黄秋元: "高速TDMA光信号收发理论研究与误码测试系统设计", 《中国博士学位论文数据库 信息科技辑》 * |
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Application publication date: 20151216 |