CN103532634A - Optical fiber communication system capable of regulating received optical power adaptively and running method thereof - Google Patents
Optical fiber communication system capable of regulating received optical power adaptively and running method thereof Download PDFInfo
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Abstract
The invention provides an optical fiber communication system capable of regulating received optical power adaptively and a running method thereof. Analog optical signal power output by an optical transmitter is larger than the sum of an upper limit value of the optimum reception power range of an optical receiver and transmission attenuation amount, an analog optical signal enters an optical attenuator and then enters the optical receiver, sampling voltage of an optical detector in the optical receiver accesses a control detection circuit which is connected with the optical attenuator. The control detection circuit comprises a single chip microcomputer and an AD/DA conversion module. The running method of the system comprises the steps as follows: the optical signal of the optical transmitter enters the optical receiver through the optical attenuator; detection voltage value of an optical detector sample resistor of the optical receiver is sent to the single chip microcomputer; and the single chip microcomputer determines the current received optical power, continues to detect if the power is in the optimum reception optical power range, otherwise, determines the attenuation according to a difference, and controls and regulates the optical attenuator. The optical fiber communication system and the running method thereof regulate received optical power dynamically and adaptively to the optimum value, stabilize optical fiber communication, are suitable for different optical receiver, and easy to implement.
Description
Technical field
The present invention relates to electronic communication field, be specifically related to optical fiber telecommunications system and operation method thereof that a kind of self adaptation regulates received optical power.
Background technology
Current, along with the data volume of communication system is increasing, signal bandwidth is more and more wider, analog signal optical fiber communication, the especially optical fiber communication of high-frequency analog signal are widely used.Existing analog optical fiber communication technology is comprised of optical sender, optical cable, optical receiver, and because transmission range is different, cable length is different, the loss of transmitting procedure is different, so the luminous power receiving in receiver is different.The optimum reception luminous power of current most of optical receiver is 2 ± 0.5dBm, and high-frequency optical receiver, such as the optical receiver optimum reception luminous power of 20GHz, 50GHz is greater than 2 ± 0.5dBm.The optimum reception luminous power that the luminous power receiving when optical receiver is greater than optical receiver can cause the saturated of receiver, causes signal of telecommunication distortion, non-linear increase, and optical receiver works long hours and in saturation condition, can reduce the useful life of device.The optimum reception luminous power that the luminous power receiving when optical receiver is less than optical receiver can cause that system gain reduces, signal amplitude declines, signal to noise ratio is deteriorated.Visible, whether the optical power value that optical receiver receives is equivalent to its optimum reception luminous power, is related to the quality of analog signal transmission in whole optical fiber telecommunications system.Just because of this reason, existing analog signal optical fiber telecommunications system is only suitable for being operated in the occasion of the specific cable length (transmission range) of system, has limited greatly the application of analog signal optical fiber telecommunications system.On the other hand, in the situation that some fused fiber splice of transmission cable, optical interface connect, thereby also can cause the received optical power of optical receiver too small because of the optical power loss that artificial origin strengthens optic path, impact receives the quality of signal.
Summary of the invention
The object of this invention is to provide the optical fiber telecommunications system that a kind of self adaptation regulates received optical power, the Output optical power of the analog laser of its optical sender be greater than the higher limit of optimum reception power bracket of optical receiver and transmission attenuation and, in optical receiver, increase a controlled optical attenuator and detect control circuit, the light that enters optical receiver is introduced into optical attenuator and enters optical receiver again, the operating voltage access control testing circuit of the photo-detector in optical receiver, the output of controlling testing circuit accesses the control end of optical attenuator.
Another object of the present invention is to provide the operation method that above-mentioned self adaptation regulates the optical fiber telecommunications system of received optical power, photo-detector in optical receiver is voltage signal access control testing circuit by received optical power size conversion, controlling testing circuit detects reception light intensity and is worth the attenuation of regulating and controlling optical attenuator according to this, through optical attenuator, regulate the laggard light power stabilising that enters optical receiver in the optimum reception luminous power of optical receiver, guarantee the quality of optical fiber communication.
The self adaptation of the present invention's design regulates the optical fiber telecommunications system of received optical power, comprise optical sender and optical receiver, optical sender is connected by optical cable with optical receiver, the analog optical signal power of analog laser in described optical sender output be greater than optical receiver optimum reception power bracket higher limit and transmission attenuation with, in described optical receiver, be connected to optical attenuator and detect control circuit, analog optical signal is introduced into optical attenuator, enter again optical receiver, the voltage access control testing circuit of the sample resistance that photo-detector connects in optical receiver, control the control end of the output access optical attenuator of testing circuit.
Described control testing circuit comprises single-chip microcomputer and analog-to-digital conversion module, D/A converter module, the voltage signal access analog-to-digital conversion module of described photo-detector, access single-chip microcomputer, the control signal of single-chip microcomputer is digital signal again, is converted to analog signal sends into optical attenuator again through D/A converter module.
Can integrated analog-to-digital conversion module and D/A converter module in described single-chip microcomputer.
Described optical attenuator is the adjustable optical attenuator that attenuation minimum resolution is less than 0.1dB.
Described single-chip microcomputer is furnished with RS-232 interface, through this interface, is connected with host computer, and host computer arranges the received optical power value that Single-chip Controlling regulates, to be suitable for different optical receivers.
The self adaptation of the present invention's design regulates the operation method of the optical fiber telecommunications system of received optical power mainly to comprise the steps:
I, beginning
The analog optical signal power of optical sender output be greater than optical receiver optimum reception power bracket higher limit and transmission attenuation with, after optical cable transmission, arrive receiving terminal, through optical attenuator, enter optical receiver;
II, power detection
The operating current of the photo-detector in optical receiver is directly proportional to received optical power, and sample resistance transfers the variation of this operating current to detection magnitude of voltage, detects voltage and sends into analog-to-digital conversion module, and the analog information that detects voltage is converted to digital signal; Detect voltage digital signal and send into single-chip microcomputer;
III, judgement
Single-chip microcomputer judges the received optical power of current optical receiver according to the detection voltage digital signal of current reception, optimum reception luminous power comparison with stored optical receiver, if current received optical power, in the optimum reception reference optical power of stored optical receiver, returns to step II;
Otherwise single-chip microcomputer is determined the attenuation of optical attenuator according to the difference of the two, the digital signal of controlling attenuation is sent into D/A converter module, convert a continuous analog voltage signal to, output to optical attenuator;
IV, optical attenuator regulate
Optical attenuator regulates light decrement under the control of single-chip microcomputer, and the reception light after decay is sent into optical receiver, returns to step II.
In native system running, current received optical power is detected to judgement, dynamic adjustments, the received optical power of optical receiver is remained in optimum reception reference optical power.
Transmission attenuation P in described step I
lossbe directly proportional to cable length S between optical sender and optical receiver, P
loss=AS, the optical signal power attenuation that A is unit length.When operation wavelength is 1260nm～1610nm, S be take kilometer as unit, A=0.2dB/ kilometer～0.4dB/ kilometer.For example optical wavelength is 0.35dB/km at 1310nm light decrement, at 1550 optical wavelength light decrements, is 025dB/km.
Described step I can reach by decay the optimum reception power bracket of optical receiver for guaranteeing the analog optical signal power that native system receiving terminal obtains, the analog optical signal power P of the analog laser output in described optical sender
out, optical receiver the higher limit P of optimum reception power bracket
oMwith transmission attenuation P
lossmeet following formula:
P
out-P
OM-P
loss＞2dB。
In described step III, after the detection voltage of every continuous 2～6 the reception analog-to-digital conversion modules of single-chip microcomputer output, calculate the average of these 2～6 reception values, using this as current detection magnitude of voltage, judge the received optical power of current optical receiver, effectively to improve analog-to-digital precision.
In described step III, the optimum reception luminous power of the optical receiver of single-chip microcomputer storage, is arranged through RS-232 interface by host computer, to meet the requirement of different optical receivers.
Compared with prior art, self adaptation of the present invention regulates the optical fiber telecommunications system of received optical power and the advantage of operation method thereof to be: 1, adopt negative-feedback principle, optical receiver and the optical attenuator connecing, control testing circuit and form a feedback loop, automatically adapt to and regulate received optical power to be stabilized in optimum reception luminous power state, in be accurately controlled at ± 0.5dBm of fluctuation range, efficiently solve the quality problems of the analog signal optical fiber communication causing because optical receiver received optical power is uncontrollable, also exempted preferably the excessive or too small harmful effect that system device is caused of the luminous power receiving because of receiver, 2, the Optical Fiber Transmission between native system optical sender and optical receiver distance is zero when changing in the scope of tens kilometers, and native system all can self adaptation regulates the power of optical receiver, has greatly expanded the application of analog signal optical fiber telecommunications system, the optimum reception luminous power that 3, optical receiver can be set by the RS-232 interface of single-chip microcomputer, is suitable for different optical receivers, 4, all devices are conventional device, so native system is easy to implement, and cost is not high yet, is easy to apply.
Accompanying drawing explanation
Fig. 1 is the optical fiber telecommunications system example structure block diagram of this self adaptation adjusting received optical power;
Fig. 2 is the operation method embodiment flow chart of the optical fiber telecommunications system of this self adaptation adjusting received optical power.
Embodiment
Self adaptation regulates the optical fiber telecommunications system embodiment of received optical power
The present embodiment as shown in Figure 1, comprise optical sender and optical receiver, optical sender is connected by optical cable with optical receiver, and the Output optical power of the analog laser in this routine optical sender is 18dBm, operation wavelength is 1550nm, and the optimum reception luminous power of described optical receiver is 1.5dBm～2.5dBm.On transmission cable, the attenuation of light signal is every kilometer of 0.25dB.This routine P
out-P
oM-P
loss=2.5dB, this routine maximum transmission distance is so: (18-2.5-2.5)/0.25=52km.This routine transmission cable is random length within the scope of 0～52km, and native system all can self adaptation regulate the optimum reception luminous power that received optical power is its optical receiver, guarantees the good quality of optical fiber communication.
In optical receiver, be connected to optical attenuator and detect control circuit, analog optical signal is introduced into optical attenuator, enter again optical receiver, the voltage access control testing circuit of the sample resistance that connects of the photo-detector in optical receiver, the output of controlling testing circuit accesses the control end of optical attenuator.In figure, pecked line represents light path, fine line indication circuit.
Described control testing circuit comprises single-chip microcomputer and analog-to-digital conversion module, D/A converter module, the voltage signal access analog-to-digital conversion module of described photo-detector, access single-chip microcomputer, the control signal of single-chip microcomputer is digital signal again, is converted to analog signal sends into optical attenuator again through D/A converter module.
This routine optical attenuator is adjustable optical attenuator, and its attenuation minimum resolution is less than 0.1dB.
Described single-chip microcomputer is furnished with RS-232 interface, is connected with host computer, and host computer arranges the received optical power value that Single-chip Controlling regulates, to be suitable for different optical receivers.
Self adaptation regulates the operation method embodiment of the optical fiber telecommunications system of received optical power
This self adaptation regulates the operation method embodiment of the optical fiber telecommunications system of received optical power, and on the optical fiber telecommunications system embodiment of above-mentioned self adaptation adjusting received optical power, operation is implemented, and its flow process as shown in Figure 2, mainly comprises the steps:
I, beginning
Analog signal in inputs optical sender, and the analog optical signal of optical sender transmitting power 18dBm arrives receiving terminal after optical cable transmission, through optical attenuator, enters optical receiver, optical receiver outputting analog signal out;
II, power detection
The operating current of the photo-detector in optical receiver is directly proportional to received optical power, and sample resistance transfers the variation of this operating current to detection magnitude of voltage, detects voltage Vt and sends into analog-to-digital conversion module, and the analog information that detects voltage is converted to digital signal; Detect voltage digital signal and send into single-chip microcomputer;
III, judgement
After the detection voltage of every continuous 5 the reception analog-to-digital conversion modules of single-chip microcomputer output, calculate the average of these 5 reception values, as current detection magnitude of voltage, single-chip microcomputer is taken this as a foundation and is judged the received optical power of current optical receiver, optimum reception luminous power comparison with stored optical receiver, if current received optical power, in the optimum reception reference optical power of stored optical receiver, returns to step II;
Otherwise single-chip microcomputer is determined the attenuation of optical attenuator according to the difference of the two, the digital signal of controlling attenuation is sent into D/A converter module, convert a continuous analog voltage signal Vc to, output to optical attenuator;
The optimum reception luminous power of the optical receiver of single-chip microcomputer storage, is arranged through RS-232 interface by host computer.
IV, optical attenuator regulate
Optical attenuator regulates light decrement under the control of single-chip microcomputer, and the reception light after decay is sent into optical receiver, returns to step II.
In native system running, current received optical power is detected to judgement, dynamic adjustments, make the received optical power of optical receiver remain on optimum reception luminous power.
Above-described embodiment, is only the specific case that object of the present invention, technical scheme and beneficial effect are further described, and the present invention is not defined in this.All any modifications of making, be equal to replacement, improvement etc., within being all included in protection scope of the present invention within scope of disclosure of the present invention.
Claims (10)
1. self adaptation regulates the optical fiber telecommunications system of received optical power, comprises optical sender and optical receiver, and optical sender is connected by optical cable with optical receiver, it is characterized in that:
The analog optical signal power of the output of the analog laser in described optical sender be greater than the higher limit of optimum reception power bracket of optical receiver and transmission attenuation and, in described optical receiver, be connected to optical attenuator and detect control circuit, the light that enters optical receiver is introduced into optical attenuator, enter again optical receiver, the voltage access control testing circuit of the sample resistance that connects of the photo-detector in optical receiver, the output of controlling testing circuit accesses the control end of optical attenuator.
2. self adaptation according to claim 1 regulates the optical fiber telecommunications system of received optical power, it is characterized in that:
Described control testing circuit comprises single-chip microcomputer and analog-to-digital conversion module, D/A converter module, the voltage signal access analog-to-digital conversion module of described photo-detector, access single-chip microcomputer, the control signal of single-chip microcomputer is digital signal again, is converted to analog signal sends into optical attenuator again through D/A converter module.
3. self adaptation according to claim 2 regulates the optical fiber telecommunications system of received optical power, it is characterized in that:
Integrated analog-to-digital conversion module and D/A converter module in described single-chip microcomputer.
4. according to the self adaptation described in any one in claims 1 to 3, regulate the optical fiber telecommunications system of received optical power, it is characterized in that:
Described optical attenuator is the adjustable optical attenuator that attenuation minimum resolution is less than 0.1dB.
5. according to the self adaptation described in any one in claim 2 or 3, regulate the optical fiber telecommunications system of received optical power, it is characterized in that:
Described single-chip microcomputer is furnished with RS-232 interface, through this interface, is connected with host computer.
6. according to the self adaptation described in any one in claim 2 or 3, regulate the operation method of the optical fiber telecommunications system of received optical power, it is characterized in that mainly comprising the steps:
I, beginning
Optical sender output analog optical signal, analog optical signal power be greater than optical receiver optimum reception power bracket higher limit and transmission attenuation with, after optical cable transmission, arrive receiving terminal, through optical attenuator, enter optical receiver;
II, power detection
The operating current of the photo-detector in optical receiver is directly proportional to received optical power, and sample resistance transfers the variation of this operating current to detection magnitude of voltage, detects voltage and sends into analog-to-digital conversion module, and the analog information that detects voltage is converted to digital signal; Detect voltage digital signal and send into single-chip microcomputer;
III, judgement
Single-chip microcomputer judges the received optical power of current optical receiver according to the detection voltage digital signal of current reception, optimum reception luminous power comparison with stored optical receiver, if current received optical power, in the scope of the optimum reception luminous power of stored optical receiver, returns to step II;
Otherwise single-chip microcomputer is determined the attenuation of optical attenuator according to the difference of the two, the digital signal of controlling attenuation is sent into D/A converter module, convert a continuous analog voltage signal to, output to optical attenuator;
IV, optical attenuator regulate
Optical attenuator regulates light decrement under the control of single-chip microcomputer, and the reception light after decay is sent into optical receiver, returns to step II.
7. self adaptation according to claim 6 regulates the operation method of the optical fiber telecommunications system of received optical power, it is characterized in that:
Transmission attenuation P in described step I
lossbe directly proportional to cable length S between optical sender and optical receiver; P
loss=AS, the optical signal power attenuation that A is unit length, when operation wavelength is 1260nm～1610nm, S be take kilometer as unit, A=0.2dB/ kilometer～0.4dB/ kilometer.
8. self adaptation according to claim 6 regulates the operation method of the optical fiber telecommunications system of received optical power, it is characterized in that:
The analog optical signal power P of the analog laser output in the optical sender in described step I
out, optical receiver the higher limit P of optimum reception power bracket
oMwith transmission attenuation P
lossmeet following formula:
P
out-P
OM-P
loss＞2dB。
9. self adaptation according to claim 6 regulates the operation method of the optical fiber telecommunications system of received optical power, it is characterized in that:
In described step III, after the detection voltage of every continuous 2～6 times the reception analog-to-digital conversion modules of single-chip microcomputer output, calculate the average of these 2～6 reception values, using this as current detection magnitude of voltage, judge the received optical power of current optical receiver.
10. self adaptation according to claim 6 regulates the operation method of the optical fiber telecommunications system of received optical power, it is characterized in that:
Described single-chip microcomputer is furnished with RS-232 interface, is connected with host computer;
In described step III, the optimum reception luminous power of the optical receiver of single-chip microcomputer storage, is arranged through RS-232 interface by host computer.
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| CN108322264A (en) * | 2018-04-12 | 2018-07-24 | 中国电子科技集团公司第三十四研究所 | A kind of radio frequency fiber optic receiving terminal of communication system based on voltage-controlled optical attenuator |
| CN110299948A (en) * | 2018-03-23 | 2019-10-01 | 中国电信股份有限公司 | The method, apparatus and optical transmission device of optical power automatic adaptation tuning |
| CN110324088A (en) * | 2019-07-23 | 2019-10-11 | 成都市德科立菁锐光电子技术有限公司 | The amplification control method of optical module and optical signal with image intensifer |
| CN113676250A (en) * | 2021-08-24 | 2021-11-19 | 桂林电子科技大学 | Wireless optical communication system and method for adaptively controlling received optical power |
| CN114966997A (en) * | 2021-02-20 | 2022-08-30 | 青岛海信宽带多媒体技术有限公司 | Optical module and received optical power monitoring method |
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Application publication date: 20140122 |