CN107592581A - A kind of method for effectively shortening GPON ONU time bursts - Google Patents
A kind of method for effectively shortening GPON ONU time bursts Download PDFInfo
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- CN107592581A CN107592581A CN201711023270.4A CN201711023270A CN107592581A CN 107592581 A CN107592581 A CN 107592581A CN 201711023270 A CN201711023270 A CN 201711023270A CN 107592581 A CN107592581 A CN 107592581A
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Abstract
The invention discloses a kind of method for effectively shortening GPON ONU time bursts, comprise the following steps：S01：Open Telnet to log in, and open register read write command；S02：Adjustment transmitting luminous power register, and judge whether to reach minimum optical power desired value；It is, it is no into next step, continue to adjust；S03：Mod look-up tables are translated, and judge whether extinction ratio reaches desired value, are, then are entered in next step；It is no, continue to adjust extinction ratio；S04：Complete.The present invention proposes one kind in the case where not changing hardware circuit, the problem of effectively handling ONU time burst deficiencies by the method for software.So that our product expanded scope when selecting optical device BOSA, the index of correlation for launching optical device is required to reduce, and then cost can be reduced and due to product excessively relies on unique device and brings risk.
Description
Technical field
The present invention relates to photoelectric field, and in particular to a kind of method for effectively shortening GPON ONU time bursts.
Background technology
FTTx is also in Huang in the state of development of China at present compared to Japan, South Korea and the U.S., the intelligent acess of China
The golden starting stage.With the raising of technical merit, the extensive listing of novel optical device and optical cable, the cost of optic communication largely drops
It is low.Simultaneously because the popularization of varied business for needing high-speed wideband data to transmit, including IPTV（Interactive network television）、
Digital session, interactive game, visual telephone, tele-medicine, distance learning, shopping at network and the Internet of Things based on smart city
Net, big data and cloud computing are risen and promoted, and requirement of the user for broadband significantly rises, simultaneously for wanting for communication quality
Also greatly raising is asked, dials up on the telephone and traditional broadband technology being transmitted using copper cash has been no longer able to meet day
The bandwidth demand that benefit increases, government and operator start to increase the attention and investment to FTTx.
With national fiber broadband implementation, three big operator's this year were all further increased for PON equipment
Deployment dynamics, to support its FTTx development.In the selection of PON technologies, EPON, GPON proportion is already not
It is principal contradiction, but depending on the feature of regional deployment.And in terms of the evolution of PON technologies of future generation, 10GPON,
The technologies such as 40G PON, WDM-PON turn into industry bone of contention.BOB parts are in core in whole ONU products
Throat status, it is mainly comprising the driving chip of light, BOSA and peripheral circuit composition.BOB is primarily referred to as BOSA
Device is accomplished on plank；So as to substitute the onboard integration that optical module realizes BOSA, so as to reduce cost.Although such as
This, the cost of bob parts, which is appointed, will so account for more than the 30% of whole product cost.Therefore the BOB parts based on PON and light
By as the core of whole product, the excellent quality that will directly determine this product of its performance.
The shortcomings that prior art, is：Existing BOB circuits disclosure satisfy that the time burst of relatively good laser
It is required that but it is relatively low for Slop efficiency, in order to reach identical transmission power and in the case of ONU burst transmissions just in instantaneous demand
It can not preferably meet to require for the laser of larger current；Especially in laser producer and performance indications relatively more not
It is particularly acute in the case of consistent.
The scheme of optical drive includes single closed loop and two close cycles two ways at present, and ONU be present under two ways can not note
Volume situation, through analysis draw, cause the problem the main reason for be GPON ONU time burst it is long.
The content of the invention
Effectively shorten GPON ONU time bursts it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of
Method, solve the problems, such as that current BOB receiving circuits are not high for the optical device suitability of different performance, overcome for property
Can be between relatively poor transmitting optical device and drive circuit suitability the problem of, during so as to shorten GPON ONU burst
Between.
The purpose of the present invention is achieved through the following technical solutions：
A kind of method for effectively shortening GPON ONU time bursts, comprises the following steps：
S01：Open Telnet to log in, and open register read write command；
S02：Adjustment transmitting luminous power register, and judge whether to reach minimum optical power desired value, as whether power is less than mesh
Scale value 0.5dbm；It is, it is no into next step, continue to adjust；
S03：Mod look-up tables are translated, and judge whether extinction ratio reaches desired value, as whether extinction ratio is less than more than 10dB
16dB, it is then to enter in next step；It is no, continue to adjust extinction ratio；
S04：Complete.
As the further improvement of this programme, in the step S03, the offset of translation mod look-up tables is 0.7.
【It is recommended that supplement：】
0.7 with the contrasts of other numerical value.
As the further improvement of this programme, in the step S02, adjustment transmitting luminous power is by turning down bias current
Realize.
The beneficial effects of the invention are as follows：The present invention proposes one kind and gone in the case where not changing hardware circuit, by soft
The method of part effectively handles the problem of ONU time burst deficiencies.So that our product expands when selecting optical device BOSA
Scope, the index of correlation for launching optical device is required to reduce, and then cost can be reduced and because product excessively relies on unique device
Part and the risk brought.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention；
Fig. 2 is the waveform figure of burst and effective optical signal.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to
It is as described below.
Physical layer overhead（Tplo）Time is used to realize five physics processes in PON, and they are：Laser ON/OFF
Time, timing wander tolerance limit, power level recovery, clock recovery, burst demarcation start.Distribute to the definite physics of these functions
Layer time portion is determined by constraints, partly by realizing that chance determines.
Tplo can be divided into three parts according to the requirement of ONU data patterns.In simple terms, these times can be with
It is divided into guard time（Tg）, leading time（Tp）And delimiting time（Td）.In Tg, ONU is sent no more than nominal " 0 " work(
Rate level.In Tp, ONU sends a lead code to realize that fast power control and clock are extensive with maximum transmission power
Multiple function.Finally, in Td, ONU sends a specific numeric data code with optimal autocorrelation, so that OLT is found
The starting point of burst.
From burst enable signal effective time to laser, the time of the stable optical signal of output is time burst.Due to
GPON upstream rates are 1.24416G/s, and it is 16bits that GPON most TX, which are enabled greatly,.So the GPON unlatching turn-off time is maximum
For 12.8ns.
As shown in Figure 1：
A kind of method for effectively shortening GPON ONU time bursts, comprises the following steps：
S01：Open Telnet to log in, and open register read write command；
S02：Adjustment transmitting luminous power register, and judge whether to reach minimum optical power desired value；It is, it is no into next step,
Continue to adjust；
S03：Mod look-up tables are translated, and judge whether extinction ratio reaches desired value, are, then are entered in next step；It is no, continue to adjust
Extinction ratio；
S04：Complete.
As the further improvement of this programme, in the step S03, translation mod look-up tables offset pass through it is certain
Experimental verification, so as to draw a preferably numerical value.
As the further improvement of this programme, in the step S02, adjustment transmitting luminous power is by turning down bias current
Realize.
It using this method, by reducing bias current, can effectively shorten the time that Tx is enabled, reduce voltage collapse,
Test data shows that the time is foreshortened within 4ns, fully meets GPON12.8ns opening time.
As shown in Figure 2：
The figure is the waveform figure of burst and effective optical signal, burst is produced at the X1 times, at the X2 times
Optical signal tends towards stability, and occurs the problem of response time extension before X1 and X2 times as seen from the figure, while for this specially
Profit provides thinking：By adjusting the DAC value and adjustment extinction ratio of transmitting luminous power, shorten GPON ONU time burst.
Described above is only the preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form, the exclusion to other embodiment is not to be taken as, and can be used for various other combinations, modification and environment, and can be at this
In the text contemplated scope, it is modified by the technology or knowledge of above-mentioned teaching or association area.And those skilled in the art are entered
Capable change and change does not depart from the spirit and scope of the present invention, then all should be in the protection domain of appended claims of the present invention
It is interior.
Claims (3)
- A kind of 1. method for effectively shortening GPON ONU time bursts, it is characterised in that comprise the following steps：S01：Open Telnet to log in, and open register read write command, write register access limit password；S02：The DAC value of adjustment transmitting luminous power, and judge whether to reach minimum optical power desired value；If it is, under One step, if not, continuing to adjust, until reaching minimum optical power desired value；S03：Mod look-up tables are translated, and judge whether extinction ratio reaches desired value, if it is, entering in next step；If not, Continue to adjust extinction ratio；S04：Complete.
- A kind of 2. method for effectively shortening GPON ONU time bursts according to claim 1, it is characterised in that：The step In rapid S03, the offset of translation mod look-up tables is 0.7.
- A kind of 3. method for effectively shortening GPON ONU time bursts according to claim 1, it is characterised in that：The step In rapid S02, adjustment transmitting luminous power is realized by turning down bias current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711023270.4A CN107592581A (en) | 2017-10-27 | 2017-10-27 | A kind of method for effectively shortening GPON ONU time bursts |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711023270.4A CN107592581A (en) | 2017-10-27 | 2017-10-27 | A kind of method for effectively shortening GPON ONU time bursts |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102625199A (en) * | 2012-04-23 | 2012-08-01 | 索尔思光电（成都）有限公司 | Dual-channel GEPON OLT CSFP (Gigabitcapable Passive Optical Network Optical Line Terminal Compact Small Form Factor Pluggable) optical module |
| CN103051388A (en) * | 2012-12-31 | 2013-04-17 | 武汉电信器件有限公司 | Device and method for optimizing burst mode transmission light module automatic light power control |
| CN106656342A (en) * | 2016-12-01 | 2017-05-10 | 博为科技有限公司 | Full-automatic temperature look-up table making system and method of optical transceiver |
-
2017
- 2017-10-27 CN CN201711023270.4A patent/CN107592581A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102625199A (en) * | 2012-04-23 | 2012-08-01 | 索尔思光电（成都）有限公司 | Dual-channel GEPON OLT CSFP (Gigabitcapable Passive Optical Network Optical Line Terminal Compact Small Form Factor Pluggable) optical module |
| CN103051388A (en) * | 2012-12-31 | 2013-04-17 | 武汉电信器件有限公司 | Device and method for optimizing burst mode transmission light module automatic light power control |
| CN106656342A (en) * | 2016-12-01 | 2017-05-10 | 博为科技有限公司 | Full-automatic temperature look-up table making system and method of optical transceiver |
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Application publication date: 20180116 |