CN102244542A - System and method for measuring vibration amplitude of irradiating power of optical emitter - Google Patents
System and method for measuring vibration amplitude of irradiating power of optical emitter Download PDFInfo
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- CN102244542A CN102244542A CN2011102406389A CN201110240638A CN102244542A CN 102244542 A CN102244542 A CN 102244542A CN 2011102406389 A CN2011102406389 A CN 2011102406389A CN 201110240638 A CN201110240638 A CN 201110240638A CN 102244542 A CN102244542 A CN 102244542A
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Abstract
The invention relates to a system and method for measuring the vibration amplitude of irradiating power of an optical emitter. In the invention, after an optical signal emitted by an optical emitter is subjected to attenuation treatment by a variable optical attenuator, the attenuated optical signal is taken as reflected light of a user environment and reflected back to the optical emitter through an optical distribution network composed of optical dividers so as to stimulate the user environment, thus the purpose of measuring the variation amplitude of irradiating power of the optical emitter under different user environments is realized, the variation amplitude of irradiating power of the optical emitter in practical use can be accurately detected, and further the invention is more beneficial to quality control on the optical emitter; the use of a single optical divider has the characteristics of simple structure and low cost, and the use of two separated optical dividers has the characteristic of expansibility; and the use of a fused biconical 2*2 optical divider is low in cost and low in transmission loss of optical signals. Simultaneously, in the invention, five steps, i.e. starting, attenuation variation, reflection, judgment and measurement, can be used to accurately detect the variation amplitude of irradiating power of the optical emitter in practical use.
Description
Technical field
The present invention relates to optical communication field, relate in particular to the technology that the luminous power jitter amplitude of optical sender in the EPON is measured.
Background technology
The used transmission line in traditional communication field all is a copper core cable, and efficiency of transmission is low, and anti-electromagnetic interference capability is poor.Because optical fiber has the efficiency of transmission height, characteristics such as anti-electromagnetic interference capability is strong, therefore, along with raising to the communications rate requirement, and the lifting of modern manufacturing process descends the optical fiber manufacturing cost, and the modern communications field more and more utilizes optical fiber to carry out transmission of Information.Optical communication network is connected to the Access Network of user terminal, can be divided into AON (Active Optical Network, active optical network) and PON (Passive Optical Network, EPON) according to whether having inserted active device.Because PON has easy maintenance, be convenient to the characteristics installing and expand, obtained using widely, and become the standard criterion of International Telecommunications Union.Wherein the most potential is EPON (Ethernet PON is based on the EPON of Ethernet).
An EPON is usually by an OLT (Optical Line Terminal, optical line terminal) who is positioned at the central office, and several are positioned at the ONU (Optical Network Unit, optical network unit) of user side and the optical distribution network that is positioned between the two constitutes.In the time of data downstream, OLT is broadcast to each ONU with downlink data packet, and each ONU mates separately according to the address information in the downlink data packet and gets final product.In the time of data uplink, because upstream data is often measured little and temporal regularity is not high, existing way is to allow each ONU with time division multiplexing work.
Optical sender is the abbreviation of the integrated module of optical transceiver, is the vitals among the EPON OLT, is made up of opto-electronic device, functional circuit and optical interface etc.Opto-electronic device comprises radiating portion and receiving unit.The course of work of radiating portion is as follows: the signal of telecommunication of a constant bit rate is launched the modulated light signal of respective rate through the processing rear drive LD of internal drive chip (Laser Diode, laser diode).
For guaranteeing normal unobstructed communication, need the luminous power of optical sender stable, therefore there is a negative feedback loop to monitor the luminous power of optical sender in optical sender inside, reply the influence that produces because of the shake of optical sender luminous power.This negative feedback loop is APC (Automatic Power Control, automated power control) loop, its structure as shown in Figure 1, at first chip for driving is sent the luminous power of the drive current of constant intensity with control LD to LD, LD flows through the light signal that this drive current then sends constant intensity, MPD (Monitor Photo-Diode, monitor photo-diode) is subjected to producing after the irradiation of the light signal that LD sends the monitor current of respective strengths, and this monitor current returns chip for driving.When the LD luminous power just often, the monitor current intensity that MPD that chip for driving is received produces also is normal, then chip for driving is not adjusted drive current.And optical sender the situation of luminous power shake all can occur usually because of a variety of causes.If the LD luminous power increases or other reasons, the luminous power that causes shining MPD increases, thereby monitor current increases, and at this moment chip for driving judges that the LD luminous power is excessive, then reduce drive current, till luminous power is got back to normal value.Equally, if the luminous power that MPD receives reduces, then monitor current reduces, and chip for driving will increase drive current, till luminous power is got back to normal value.
The reason that optical sender produces the luminous power shake mainly contains following 2 points:
The one, can produce the luminous power shake during reverberation irradiation MPD.Because the refractive index that welding point, flexible connection point and optical fiber connector etc. are located is discontinuous, certainly exists certain reverberation.Can shine the MPD of optical sender when reverberation, when monitor current is increased, can cause chip for driving to produce erroneous judgement and think that the LD luminous power is excessive, so reduce drive current, thereby reduce the LD luminous power, when monitor current is got back to normal value, just can settle out.And the luminous power of LD reality is lower than normal value at this moment.
The 2nd, also can produce the luminous power shake during reverberation irradiation LD.That LD of the prior art adopts is DFB LD (Distributed Feedback LD, distributed feed-back formula laser diode) as light source, when reverberation is got back to optical sender, have the resonant cavity that unnecessary reverberation enters DFB LD, with former diffuse lightwave mutual superposition or the counteracting in the resonant cavity, thereby make the laser power that from resonant cavity, penetrates bigger than normal or less than normal.
The luminous power size of optical sender is just to have set by the drive current intensity of setting chip for driving before dispatching from the factory in the reality, and whether the shake that this default luminous power produces can adapt to the different user environment of intensity of reflected light and unclear, and the optical sender that occurs same model under the different user environments often is because of the excessive situation that can't normally use of luminous power shake deviation; Whether the characteristics of luminescence of optical sender, service behaviour, life-span etc. well all need to detect in the different user environment simultaneously, well the quality of monitor optical transmitter.
Prior art all is directly with light power meter the luminous power of optical sender to be carried out record, draws the luminous power jitter amplitude of optical sender at last according to the difference of maximum in the data and minimum value.Such technology is the different user environment of simulated reflections luminous intensity exactly, the luminous power degree of jitter of optical sender in the time of also just can't measuring the reality use.
Summary of the invention
At the problems referred to above, first purpose of the present invention is to provide a kind of measuring system of optical sender luminous power jitter amplitude of can the simulated reflections luminous intensity different user environment.
At the problems referred to above, second purpose of the present invention is to provide a kind of method of measurement of optical sender luminous power jitter amplitude of can the simulated reflections luminous intensity different user environment.
First purpose of the present invention is achieved through the following technical solutions:
A kind of measuring system of optical sender luminous power jitter amplitude, comprise measured optical sender, the light power meter that is used for measuring light power to small part, the optical distribution network that is used for transmitting optical signal to small part, the adjustable optical attenuator that is used to adjust luminous intensity to small part, it is characterized in that: the optical signals optical sender sends, and is transferred to adjustable optical attenuator through optical distribution network; Adjustable optical attenuator carries out the attenuate light signal that obtains after the attenuation processing to light signal, through optical distribution network, is transferred to optical sender and light power meter simultaneously.
Further, described optical distribution network comprises first optical branching device, this first optical branching device first input end is connected to optical sender, first optical branching device, second input is connected to light power meter, first optical branching device, first output is connected to the adjustable optical attenuator input, and first optical branching device, second output is connected to the adjustable optical attenuator output.Directly the optical branching device with a transmission performance symmetry receives or send light signal as optical distribution network, and is simple in structure, and it is convenient, with low cost to realize.
Further again, described optical distribution network comprises second optical branching device, the 3rd optical branching device; This second optical branching device first input end is connected to optical sender, and second optical branching device, second input is connected to light power meter, and second optical branching device, second output is connected to the 3rd optical branching device first input end; The 3rd optical branching device first output is connected to the adjustable optical attenuator input, and the 3rd optical branching device second output is connected to the adjustable optical attenuator output.As optical distribution network, the optical fiber of certain-length can be installed between the optical branching device of these two separation with the optical branching device of two separation, better simulate the user environment that optical fiber in the reality all has certain-length.
Further again, described second optical branching device, first output is connected to the first expansion mouth; Described the 3rd optical branching device second input is connected to the second expansion mouth.On these two optical branching devices, leave the expansion mouth respectively, conveniently connect the other system module, help the expansion of systemic-function.
Also further, described optical branching device is
Optical branching device.Use
Optical branching device and not using
,
Wait other advantages to be to reduce the loss of light signal by optical distribution network with optical branching device of at least 2 inputs and at least 2 outputs.
Also further, described optical branching device is the fused tapered optical branching device.Under the smaller situation of beam split way, use the fused tapered optical branching device cheap, lowered industrial cost.
Second purpose of the present invention is achieved through the following technical solutions:
A kind of method of measurement of optical sender luminous power jitter amplitude may further comprise the steps:
S1, the beginning step: optical sender sends light signal, and light signal is transferred to adjustable optical attenuator through optical distribution network;
S2, the adjustable damping step: Mo Ni user environment as required, utilize adjustable optical attenuator manually to set the attenuation degree of light signal, the output attenuatoin light signal;
S3, reflection steps: the attenuate light signal is considered as the user environment reverberation, transmits light echo transmitter and light power meter simultaneously;
S4, determining step: light power meter detects the user environment reverberation desired tolerance limit of user environment of simulation of whether satisfying the demand, if do not satisfy then repeat S2; If satisfy then carry out next step;
S5, measuring process: light power meter writes down the luminous power of this attenuate light signal, with the difference of maximum in the record data and the minimum value jitter amplitude as the optical sender luminous power.
Beneficial effect of the present invention is:
After the present invention carries out attenuation processing by the light signal that optical sender is sent with adjustable optical attenuator, the attenuate light signal is considered as the reverberation of user environment, and the optical distribution network reflected light transmitter of forming by optical branching device, come the analog subscriber environment with this, reach the purpose of measuring optical sender luminous power jitter amplitude under the different user environment, thereby can correctly detect the luminous power jitter amplitude of the optical sender in reality is used, and then more help optical sender is carried out quality monitoring; Further, use single optical branching device to have the low characteristics of cost simple in structure, use the optical branching device of two separation then to have the characteristics of expansibility; Use fused tapered
Optical branching device is with low cost, and the optical signal transmission loss is low.Simultaneously, the present invention also can realize the correct function that detects the luminous power jitter amplitude of the optical sender in reality is used by beginning, adjustable damping, reflection, judgement, five steps of measurement.
Description of drawings
Fig. 1 is the structure chart of APC loop in the prior art;
Fig. 2 is a system module structural representation of the present invention;
Fig. 3 is the system configuration schematic diagram of one embodiment of the present of invention;
Fig. 4 is the system configuration schematic diagram of the preferred embodiment of the invention;
Fig. 5 is the method flow schematic diagram of one embodiment of the invention.
Embodiment
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.The description to alternative features is to being equal to the description of technical characterictic, must not being considered as the donation to the public in this specification simultaneously.
Term in this specification (comprising any claim, summary and accompanying drawing) if no special instructions, all is defined as the peculiar implication in this area if having the peculiar implication of general sense and this area simultaneously.
Embodiment one:
As shown in Figure 2, a kind of measuring system of optical sender luminous power jitter amplitude, by measured optical sender, the light power meter that is used for measuring light power, the optical distribution network and the adjustable optical attenuator composition that is used to adjust luminous intensity that are used for transmitting optical signal, the optical signals optical sender sends, and is transferred to adjustable optical attenuator through optical distribution network; Adjustable optical attenuator carries out the attenuate light signal that obtains after the attenuation processing to light signal, through optical distribution network, is transferred to optical sender and light power meter simultaneously.After carrying out attenuation processing by the light signal that optical sender is sent with adjustable optical attenuator, the attenuate light signal is considered as the reverberation of user environment, and by optical distribution network reflected light transmitter, come the analog subscriber environment with this, reach the purpose of measuring optical sender luminous power jitter amplitude under the different user environment.In the present embodiment, optical sender is the product to be measured of optical module manufacturer, light power meter and the common on the market product of adjustable optical attenuator buying get final product, such as model is the hand-held light power meter of PMSII-A, and model is the adjustable optical attenuator of the Wuhan light news scientific ﹠ technical corporation of OAT-F-135-SC/PC-03.
Embodiment two:
As shown in Figure 3, a kind of measuring system of optical sender luminous power jitter amplitude by measured optical sender, is used for the light power meter of measuring light power, is used for transmitting optical signal
Fused tapered first optical branching device and the adjustable optical attenuator composition that is used to adjust luminous intensity, this first optical branching device first input end IN11 is connected to optical sender, first optical branching device, the second input IN12 is connected to light power meter, first optical branching device, the first output OUT11 is connected to the adjustable optical attenuator input, and first optical branching device, the second output OUT12 is connected to the adjustable optical attenuator output.
Because optical branching device is symmetrical structure, input and output are identical on internal structure, so the input of optical branching device also can be used as output, and in like manner, its output also can be used as input.For
Optical branching device, from an input input, former light signal can be divided into the new light signal of almost completely identical two-way to be exported, and just the new light signal strength of this moment becomes 50% of former light signal.The optical sender that with power is 12mW is an example, and its splitting loss is 10lg12-10lg(
)=10lg (12/ (
))=10lg2=3.01dB, if count in
The supplementary load loss 0.2dB of optical branching device, then light signal from
Input input of optical branching device, an output output, its power loss is roughly 3.2dB.Because of using as if use
,
Wait other optical branching device splitting losss can be bigger, be unfavorable for regulation and control, so the present embodiment use with at least 2 inputs and at least 2 outputs
Optical branching device; Simultaneously, under the smaller situation of beam split way, use fused tapered optical branching device price cheaper.
Therefore, suppose that the tolerance limit that custom system requires in the present embodiment is that this unit of 12dBm(is the ratio of gains unit that is used for power), and the power of optical sender is 0dBm, then needs the reverberation of reflected light transmitter to be-12dBm.Weaken when the light signal of the 0dBm that sends of optical sender is through first optical branching device so and be-3.3dBm, and enter the input and the input of adjustable optical attenuator simultaneously, because adjustable optical attenuator is not a symmetrical structure, so ignore the light signal that enters the adjustable optical attenuator output; The attenuation degree that makes adjustable optical attenuator is XdBm, and then Shu Chu attenuate light signal is-(3.3+X) dBm at this moment; This attenuate light signal is attenuated to through first optical branching device once more-(3.3+X+3.3) dBm, and enter optical sender and light power meter simultaneously.Detect by the power of light power meter, if be greater than or less than-attenuation degree of the then corresponding adjusting adjustable optical attenuator of 12dBm, make the attenuate light signal that arrives optical sender be-12dBm the attenuate light signal.In theory, because tolerance limit is 12dBm, then (0-(3.3+X+3.3)) dBm=12 dBm, and obtaining X=5.6, the attenuation degree of the adjustable optical attenuator of promptly manually regulating is 5.6dBm.But because refractive indexes such as the interface of optical branching device and adjustable optical attenuator, tie point are different, will inevitably have certain reverberation in the reality, the attenuation degree of adjustable optical attenuator is slightly larger than 5.6dBm in the historical facts or anecdotes border.
At this moment, measuring system has been simulated the user environment that a reverberation reaches the custom system tolerance limit, under this user environment, and the luminous power jitter amplitude of light power meter opening entry optical sender.Can be after optical sender power on 5 minutes, per 15 seconds records once write down 10 minutes.The maximum in then will writing down and the difference of minimum value are as the jitter amplitude of optical sender luminous power.
Optical branching device in the present embodiment can adopt the common model in market to get final product, and such as the Splitter/ Φ 3.0*60 (2*2 1230 ~ 1390nm/1450 ~ 1510nm 50%:50% 0.9mm tail optical fiber SC/UPC) of Wuhan light news scientific ﹠ technical corporation, all the other devices are with embodiment one.
Embodiment three:
As shown in Figure 4, a kind of measuring system of optical sender luminous power jitter amplitude by measured optical sender, is used for the light power meter of measuring light power, is used for transmitting optical signal
Fused tapered second optical branching device, the 3rd optical branching device and being used to adjusted the adjustable optical attenuator of luminous intensity and formed, this second optical branching device first input end IN21 is connected to optical sender, second optical branching device, the second input IN22 is connected to light power meter, second optical branching device, the second output OUT22 is connected to the 3rd optical branching device first input end IN31, and second optical branching device, the first output OUT21 is connected to the first expansion mouth; The 3rd optical branching device first output OUT31 is connected to the adjustable optical attenuator input, and the 3rd optical branching device second output OUT32 is connected to the adjustable optical attenuator output, and the 3rd optical branching device second input IN32 is connected to the second expansion mouth.
The course of work of present embodiment and embodiment two are similar, the light signal of optical sender becomes the attenuate light signal through being carried out attenuation processing by adjustable optical attenuator behind second optical branching device and the 3rd optical branching device continuously, this attenuate light signal through behind the 3rd optical branching device and second optical branching device, sends to optical sender and light power meter once more simultaneously.Adjust adjustable optical attenuator, the tolerance limit that the attenuate light signal that optical sender and light power meter are received satisfies custom system requires to get final product.Get final product with the luminous power jitter amplitude of light power meter measuring light transmitter this moment again.
In the present embodiment first expansion mouth is used to be connected other system module, extension system function with the second expansion mouth.Such as, can be at the spectrum of expansion mouthful access spectrometer with test light transmitter light signal; Because common optical fiber is long optical fibers such as 10KM or 20KM in the reality, therefore the expansion mouth also can insert long optical fibers, to detect the fine transmittability of length of optical sender.Used device is with embodiment two in all the other present embodiments.
Embodiment four:
A kind of method of measurement of optical sender luminous power jitter amplitude, form by following steps:
S1, the beginning step: optical sender sends light signal, and light signal is transferred to adjustable optical attenuator through optical distribution network;
S2, the adjustable damping step: Mo Ni user environment as required, utilize adjustable optical attenuator manually to set the attenuation degree of light signal, the output attenuatoin light signal;
S3, reflection steps: the attenuate light signal is considered as the user environment reverberation, transmits light echo transmitter and light power meter simultaneously;
S4, determining step: light power meter detects the user environment reverberation desired tolerance limit of user environment of simulation of whether satisfying the demand, if do not satisfy then repeat S2; If satisfy then carry out next step;
S5, measure: light power meter writes down the luminous power of this attenuate light signal, with the difference of maximum in the record data and the minimum value jitter amplitude as the optical sender luminous power.
Claims (7)
1. the measuring system of an optical sender luminous power jitter amplitude, comprise measured optical sender, the light power meter that is used for measuring light power to small part, the optical distribution network that is used for transmitting optical signal to small part, the adjustable optical attenuator that is used to adjust luminous intensity to small part is characterized in that:
The optical signals optical sender sends, and is transferred to adjustable optical attenuator through optical distribution network; Adjustable optical attenuator carries out the attenuate light signal that obtains after the attenuation processing to light signal, through optical distribution network, is transferred to optical sender and light power meter simultaneously.
2. according to the measuring system of the described optical sender luminous power of claim 1 jitter amplitude, it is characterized in that:
Described optical distribution network comprises first optical branching device, this first optical branching device first input end (IN11) is connected to optical sender, first optical branching device, second input (IN12) is connected to light power meter, first optical branching device, first output (OUT11) is connected to the adjustable optical attenuator input, and first optical branching device, second output (OUT12) is connected to the adjustable optical attenuator output.
3. according to the measuring system of the described optical sender luminous power of claim 1 jitter amplitude, it is characterized in that:
Described optical distribution network comprises second optical branching device, the 3rd optical branching device;
This second optical branching device first input end (IN21) is connected to optical sender, second optical branching device, second input (IN22) is connected to light power meter, and second optical branching device, second output (OUT22) is connected to the 3rd optical branching device first input end (IN31);
The 3rd optical branching device first output (OUT31) is connected to the adjustable optical attenuator input, and the 3rd optical branching device second output (OUT32) is connected to the adjustable optical attenuator output.
4. according to the measuring system of claim 3 optical sender luminous power jitter amplitude, it is characterized in that:
Described second optical branching device, first output (OUT21) is connected to the first expansion mouth; Described the 3rd optical branching device second input (IN32) is connected to the second expansion mouth.
5. according to the measuring system of claim 2 or 3 or 4 described optical sender luminous power jitter amplitudes, it is characterized in that: described optical branching device is
Optical branching device.
6. according to the measuring system of claim 2 or 3 or 4 described optical sender luminous power jitter amplitudes, it is characterized in that: described optical branching device is the fused tapered optical branching device.
7. the method for measurement of an optical sender luminous power jitter amplitude is characterized in that, may further comprise the steps:
S1, the beginning step: optical sender sends light signal, and light signal is transferred to adjustable optical attenuator through optical distribution network;
S2, the adjustable damping step: Mo Ni user environment as required, utilize adjustable optical attenuator manually to set the attenuation degree of light signal, the output attenuatoin light signal;
S3, reflection steps: the attenuate light signal is considered as the user environment reverberation, transmits light echo transmitter and light power meter simultaneously;
S4, determining step: light power meter detects the user environment reverberation desired tolerance limit of user environment of simulation of whether satisfying the demand, if do not satisfy then repeat S2; If satisfy then carry out next step;
S5, measure: light power meter writes down the luminous power of this attenuate light signal, with the difference of maximum in the record data and the minimum value jitter amplitude as the optical sender luminous power.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107769798A (en) * | 2017-10-18 | 2018-03-06 | 青岛海信宽带多媒体技术有限公司 | A kind of method and device for controlling radio frequency output signal power invariability |
| CN116131940A (en) * | 2023-04-17 | 2023-05-16 | 广州赛宝计量检测中心服务有限公司 | Calibration device, system and method for optical discontinuity tester |
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| US20100178502A1 (en) * | 2007-04-27 | 2010-07-15 | Spilman Gary E | Low volatiles coatings, sealants and binders from renewable oils |
| CN102158279A (en) * | 2011-03-18 | 2011-08-17 | 北京锐锋钝石科技有限公司 | Light power monitoring system and method thereof |
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| CN101179331A (en) * | 2006-11-08 | 2008-05-14 | 中兴通讯股份有限公司 | Automatic debugging method and system of optical module |
| US20100178502A1 (en) * | 2007-04-27 | 2010-07-15 | Spilman Gary E | Low volatiles coatings, sealants and binders from renewable oils |
| CN102158279A (en) * | 2011-03-18 | 2011-08-17 | 北京锐锋钝石科技有限公司 | Light power monitoring system and method thereof |
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| CN107769798A (en) * | 2017-10-18 | 2018-03-06 | 青岛海信宽带多媒体技术有限公司 | A kind of method and device for controlling radio frequency output signal power invariability |
| CN116131940A (en) * | 2023-04-17 | 2023-05-16 | 广州赛宝计量检测中心服务有限公司 | Calibration device, system and method for optical discontinuity tester |
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Application publication date: 20111116 |