CN104980225B - A kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM) - Google Patents

A kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM) Download PDF

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Publication number
CN104980225B
CN104980225B CN201510440141.XA CN201510440141A CN104980225B CN 104980225 B CN104980225 B CN 104980225B CN 201510440141 A CN201510440141 A CN 201510440141A CN 104980225 B CN104980225 B CN 104980225B
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China
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signal
circuit
current
optical
amplitude
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CN201510440141.XA
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Chinese (zh)
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CN104980225A (en
Inventor
梁飞
徐红春
周日凯
张玉安
郑勇志
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武汉光迅科技股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40Transceivers

Abstract

The invention discloses a kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM), belong to communication technical field.The optical module, including low frequency base band amplitude overmodulated circuit, laser driving circuit, laser, electric absorption signal modulation circuit, electroabsorption modulator, avalanche photodide, trsanscondutance amplifier, limiting amplifier, circuit mirror current, low frequency demodulator circuit.Compared to traditional optical module, monitoring signal is loaded on the envelope of institute's bearer service signal by the optical module described in the technical program by amplitude modulation(PAM), optical cable and channel resource are shared with bearer service signal, channel resource is saved, and the monitoring signal of transparent transmission is unrelated with institute bearer service signaling protocol, the use flexibility with height;Because optical module is internally integrated low speed modulates baseband signals demodulating unit, without outside extra increase light functional unit, the transparent transmission of monitoring signal is can be achieved with, is the solution of most economic benefit to the application scenarios for needing transmitting, monitoring signal.

Description

A kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM)
Technical field
Accessed the present invention relates to communication technical field, particularly Optical Transmission Network OTN, mobile forward pass, mobile retransmission, fixed broadband, The communications fields such as big customer's access via telephone line, more particularly to a kind of interior transparent transmission monitoring signal of band based on amplitude modulation(PAM) optical module.
Background technology
The continuous expansion of communication network primary transmission capacity and the continuous improvement of speed cause fiber optic communication to turn into present information The prevailing transmission means of network.In present optical communication network, the optical transceiver module of one of core opto-electronic device is used as Species is more and more, it is desirable to also more and more higher, and complexity also develops with surprising rapidity.
Meanwhile, increasing fiber optic communication application scenarios require that optical transceiver module can not only transmit its business carried Signal, while also various management and monitoring signal can be transmitted.Because the business of carrying varies, in order that management and monitoring Information is independent of service signal, and traditional method is to open up a special wavelength channel to carry out transmitting, monitoring signal.
Traditional optical transceiver module does not possess simultaneous transmission service signal and monitoring signal function so that operator is in various need The application scenarios of transmitting, monitoring signal are wanted to have to increase extra optical cable and channel resource, it has to increase extra light transmitting-receiving Module and division wave device, these all bring such as input cost rising to operator, and the availability of frequency spectrum is high, multi-standard and The disunity of multi-protocols, the problems such as cost of equipment is expensive.
The content of the invention
The present invention proposes a kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM), can be good at solving Above mentioned problem in background technology.This programme using amplitude modulation(PAM) by monitoring signal by being loaded into the bag of institute's bearer service signal On network, optical cable and channel resource are shared with bearer service signal, channel resource can be saved to greatest extent, and transparent transmission is monitored Signal is unrelated with bearer service signaling protocol, the use flexibility with height, the application scenarios to needing transmitting, monitoring signal, It is the solution of most economic benefit.
The technical solution adopted by the present invention is:
A kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM), the optical module, including transmitting element and Receiving unit;The transmitting element, including for base band supervisory signal to be modulated into the low frequency base band of low-speed voltage modulated signal Amplitude overmodulated circuit, the laser driving circuit for low-speed voltage modulated signal to be transformed into low speed current modulated, For loading the laser of low speed current modulated, the electric absorption signal for service signal to be generated to high speed electric impulse signal Modulation circuit, the electroabsorption modulator for controlling whether the light wave that absorption is sent by laser by high speed electric impulse signal;Institute State receiving unit, including for receiving the optical signal from outside optical-fiber network and converting optical signals into the snowslide light of current signal Electric diode, the trsanscondutance amplifier for main road current pulse signal to be converted into voltage pulse signal, for voltage pulse Signal shaping, which is recovered, receives the limiting amplifier of service signal, for branch current signal to be transformed into and main road current signal The circuit mirror current of proportional current pulse signal, believe for current pulse signal to be demodulated into reception base band low speed monitoring Number low frequency demodulator circuit;
Wherein, the low frequency base band amplitude overmodulated circuit is connected by laser driving circuit with laser, the electricity Absorption signal modulation circuit is connected with electroabsorption modulator, and the laser is connected with electroabsorption modulator;The avalanche optoelectronic A wherein output port for diode is connected by trsanscondutance amplifier with limiting amplifier, the avalanche photodide it is another Output port is connected by circuit mirror current with low frequency demodulator circuit.
Wherein, the low frequency base band amplitude overmodulated circuit, including for determining the modulation of baseband amplitude ovennodulation signal The first digital analog converter and the second digital analog converter of depth and the amplitude for modulating baseband amplitude ovennodulation signal amplitude Modulator;
Wherein, the output of first digital analog converter and the output of the second digital analog converter connect the amplitude and adjusted respectively The input of device processed.
Wherein, the low frequency demodulator circuit, including for filtering out the high frequency service signal in current pulse signal to retain Electricity is amplified in the low-pass filter circuit of low frequency monitoring signal, the mutual conductance for low-frequency current signal to be converted into low-frequency voltage signal Road, the comparison decision circuit for low-frequency voltage signal to be recovered to reception base band low frequency monitoring signal;
Wherein, the low-pass filter circuit is connected by mutual conductance amplifying circuit with comparing decision circuit.
Wherein, the circuit mirror current uses mirror current source to produce branch road equal with main road size of current all the way Electric current, or use current sampling circuit with by main road electric current by current/voltage translation circuit be converted into main road electric current into The voltage signal of ratio.
A kind of optical communication system, including, the first optical transceiver module and the second optical transceiver module, first optical transceiver module It is connected by optical communication network with the second optical transceiver module;
Wherein, first optical transceiver module and the second optical transceiver module are optical module described above.
Beneficial effect:
A kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM) of the present invention, including transmitting element and Receiving unit;The transmitting element, including for base band supervisory signal to be modulated into the low frequency base band of low-speed voltage modulated signal Amplitude overmodulated circuit, the laser driving circuit for low-speed voltage modulated signal to be transformed into low speed current modulated, For loading the laser of low speed current modulated, the electric absorption signal for service signal to be generated to high speed electric impulse signal Modulation circuit, the electroabsorption modulator for controlling whether the light wave that absorption is sent by laser by high speed electric impulse signal;Institute State receiving unit, including for receiving the optical signal from outside optical-fiber network and converting optical signals into the snowslide light of current signal Electric diode, the trsanscondutance amplifier for main road current pulse signal to be converted into voltage pulse signal, for voltage pulse Signal shaping, which is recovered, receives the limiting amplifier of service signal, for branch current signal to be transformed into and main road current signal The circuit mirror current of proportional current pulse signal, believe for current pulse signal to be demodulated into reception base band low speed monitoring Number low frequency demodulator circuit.It can be seen that, optical module of the present invention due to monitoring signal is carried on optical service signal envelope, It is therefore not necessary to additionally increase light-path, existing optical cable and conduit resource can be shared to greatest extent;Because monitoring signal is to be carried in On optical service signal envelope, therefore, the program is unrelated with communication protocol, great flexibility;Due to without outside extra increase light Functional unit, most program Optimum cost, economic value.
Brief description of the drawings
Fig. 1 is a kind of optical mode for the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM) that the specific embodiment of the invention is provided The internal structure functional block diagram of block.
Fig. 2 is the functional block diagram for the low frequency base band amplitude overmodulated circuit that the specific embodiment of the invention is provided.
Fig. 3 is the functional block diagram for the low frequency demodulator circuit that the specific embodiment of the invention is provided.
Fig. 4 is a kind of point-to-point communication application scenarios that the specific embodiment of the invention is provided.
Fig. 5 is the oscillogram for the transmission base band supervisory signal that the specific embodiment of the invention is provided.
Fig. 6 is the oscillogram for the low-speed voltage modulated signal that the specific embodiment of the invention is provided.
Fig. 7 is the oscillogram of the bearer service signal for the carrying monitoring signal information that the specific embodiment of the invention is provided.
In figure:
10:First optical transceiver module; 20:Second optical transceiver module;
11:Laser; 21:Avalanche photodide;
12:Electroabsorption modulator; 22:Circuit mirror current;
13:Laser driving circuit; 23:Trsanscondutance amplifier;
14:Low frequency base band amplitude overmodulated circuit; 24:Limiting amplifier;
15:Electric absorption signal modulation circuit; 25:Low frequency demodulator circuit;
30:Optical communication network;
141:First digital analog converter;
142:Second digital analog converter;
143:Amplitude modulator;
251:Low-pass filter circuit;
252:Mutual conductance amplifying circuit;
253:Compare decision circuit.
Embodiment
The present invention is described in detail with reference to embodiment and accompanying drawing.
Fig. 1 is a kind of optical mode for the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM) that the specific embodiment of the invention is provided The internal structure functional block diagram of block.As shown in figure 1, the present invention proposes a kind of interior transparent transmission monitoring signal of band based on amplitude modulation(PAM) Optical module, including transmitting element and receiving unit;The transmitting element, including for base band supervisory signal to be modulated into low speed The low frequency base band amplitude overmodulated circuit 14 of voltage modulation signal, for by low-speed voltage modulated signal be transformed into low speed electric current adjust The laser driving circuit 13 of signal processed, the laser 11 for loading low speed current modulated, for service signal to be given birth to Electric absorption signal modulation circuit 15 into high speed electric impulse signal, for controlling whether to absorb by laser by high speed electric impulse signal The electroabsorption modulator 12 for the light wave that device 11 is sent;The receiving unit, including for receiving the light letter from outside optical-fiber network Number and convert optical signals into the avalanche photodide 21 of current signal, for main road current pulse signal to be converted into voltage The trsanscondutance amplifier 23 of pulse signal, the limiting amplifier for recovering reception service signal to voltage pulse signal shaping 24th, for branch current signal to be transformed into the circuit mirror current of the current pulse signal proportional to main road current signal 22nd, the low frequency demodulator circuit 25 of base band low speed monitoring signal is received for current pulse signal to be demodulated.
Below in conjunction with accompanying drawing 1, internal structure and the interconnection of each functional unit to optical module of the present invention are done furtherly It is bright.
The low frequency base band amplitude overmodulated circuit 14 is connected by laser driving circuit 13 with laser 11, the electricity Absorption signal modulation circuit 15 is connected with electroabsorption modulator 12, and the laser 11 is connected with electroabsorption modulator 12;It is described A wherein output port for avalanche photodide 21 is connected by trsanscondutance amplifier 23 with limiting amplifier 24, the snowslide light Another output port of electric diode 21 is connected by circuit mirror current 22 with low frequency demodulator circuit 25.
As shown in figure 1, the signal flow direction of the optical module bearer service signal is:
Tx1 is to send service signal, and Tx1 generates high speed electric impulse signal Vx1 by electric absorption signal modulation circuit 15, Vx1 controls electroabsorption modulator 12 goes to absorb or does not absorb the light wave sent by laser 11, and reaching makes output optical pulse code stream By the purpose of electric pulse bite rate control.Light pulse code stream is transmitted by outside optical-fiber network 30, and avalanche photodide 21 connects The light pulse code stream from outside optical-fiber network 30 is received, main road current impulse Ix2 is converted into voltage pulse by trsanscondutance amplifier 23 Vx2, Vx2 carry out shaping by limiting amplifier 24, recover reception service signal Rx2.
It should be noted that electroabsorption modulator 12 is to utilize the optical signal that exciton absorption effect is made in semiconductor Modulation device, fast response time, operating power consumption is low.Avalanche photodide 21 is a kind of light detection diode of P-N junction type, profit Amplify photosignal with the avalanche multiplication effect of carrier, light pulse can be converted into current impulse.
As shown in figure 1, the signal flow direction of the low speed monitoring signal of the optical module transmission is:
S (t) 1 is to send base band supervisory signal (as shown in Figure 5), and s (t) 1 passes through low frequency base band amplitude overmodulated circuit 14 It is modulated into behind low-speed voltage modulated signal V (t) 1 (as shown in Figure 6), the internal structure of low frequency base band amplitude overmodulated circuit 14 It will be further described.V (t) 1 is transformed into low speed current modulated I (t) 1 by laser driving circuit 13, and I (t) 1 is used for driving Dynamic laser 11.Due to laser 11 light output amount and be carried in the certain proportionate relationship of 1 one-tenth of driving current I (t) thereon, The luminous power amplitude that thus laser 11 is exported is by the indirect controls of base band low frequency monitoring signal s (t) 1.Laser 11 is inhaled as electricity The light source of modulator 12 is received, base band low speed monitoring signal s (t) 1 can be loaded into and send service signal Tx1 envelope up, The bearer service signal (as shown in Figure 7) for the carrying monitoring signal information being modulated into is sent to outside optical-fiber network 30.Snowslide light Electric diode 21 receives the optical signal from outside optical-fiber network 30, converts thereof into current signal, and main road current signal Ix2 passes through Trsanscondutance amplifier 23, limiting amplifier 24 recover reception service signal Rx2.Branch current signal passes through circuit mirror current 22 The current pulse signal I (t) 2 equal or proportional to main road current signal is transformed into, I (t) 2 is solved by low frequency demodulator circuit 25 Recall reception base band low speed monitoring signal d (t) 2.It will be further described behind the internal structure of low frequency demodulator circuit 25.
It should be noted that temperature has large effect to the characteristic of laser 11, in order that the power output of laser 11 It is stable, generally require and temperature control is carried out to it, the laser 11 generally carries TEC thermostatic control modules.
Below in conjunction with accompanying drawing 2, internal structure and the interconnection of each functional unit to low frequency base band amplitude overmodulated circuit 14 are done Further illustrate.
Fig. 2 describes a kind of embodiment of low frequency base band amplitude overmodulated circuit 14, includes for determining base The first digital analog converter 141 and the second digital analog converter 142 of modulation depth with amplitude ovennodulation signal and for modulating The amplitude modulator 143 of baseband amplitude ovennodulation signal amplitude.Wherein, the numbers of the output Va of the first digital analog converter 141 and second The output Vb of weighted-voltage D/A converter 142 connects the input of amplitude modulator 143 respectively.Va, Vb size are adjustable, and Va, Vb size are determined The modulation depth of baseband amplitude ovennodulation signal, modulation depth is needed between bearer service signal and low speed monitoring signal performance Weighed.Modulation depth is bigger, and low speed monitoring signal receiving sensitivity is higher, the bit error rate is lower, and bearer service signal connects Receipts sensitivity is lower, and the bit error rate is higher;Conversely, modulation depth is smaller, low speed monitoring signal receiving sensitivity is lower, the bit error rate more Height, and bearer service signal receiving sensitivity is higher, the bit error rate is lower.
Below in conjunction with accompanying drawing 3, internal structure and the interconnection of each functional unit to low frequency demodulator circuit 25 are described further.
Fig. 3 describes a kind of embodiment of low frequency demodulator circuit 25, includes for filtering out current pulse signal In high frequency service signal to retain the low-pass filter circuit 251 of low frequency monitoring signal, for low-frequency current signal to be converted into The mutual conductance amplifying circuit 252 of low-frequency voltage signal, for low-frequency voltage signal to be recovered receive base band low frequency monitoring signal Compare decision circuit 253, wherein, the low-pass filter circuit 251 is by mutual conductance amplifying circuit 252 with being compared decision circuit 253 Connection.
Current pulse signal I (t) 2 includes high frequency service signal and low frequency monitoring signal simultaneously, and I (t) 2 passes through low pass filtered Ripple device 251 filters out high frequency service signal composition, only retains low frequency monitoring signal I (t) 2 ', low frequency monitoring signal I (t) 2 ' by across Amplifying circuit 252 is led, low-frequency current signal low-frequency voltage signal V (t) 2 is converted into, low-frequency voltage signal V (t) 2 is by comparing Decision circuit 253 recovers reception base band low frequency monitoring signal d (t) 2.
In this programme, it is big with main road electric current all the way to produce that the circuit mirror current 22 can use mirror current source Small equal branch current, it would however also be possible to employ current sampling circuit is so that main road electric current to be changed by current/voltage translation circuit Into the voltage signal with main road current in proportion.
With reference to embodiments and Fig. 4, the application scenarios of the present invention are described further.
Fig. 4 describes a kind of application scenarios that point-to-point communication is carried out using optical module of the present invention.As shown in figure 4, A kind of optical communication system, includes the first optical transceiver module 10, the second light transmitting-receiving mould 20, optical communication network 30, first light Transceiver module 10 is connected by optical communication network 30 with the second optical transceiver module 20.The first light in described optical communication system is received The hair optical transceiver module 20 of module 10 and second uses the interior transparent transmission monitoring signal of the band described above based on amplitude modulation(PAM) Optical module.
As shown in figure 4, Tx1 is the transmission service signal of the first optical transceiver module 10, s (t) 1 is the first optical transceiver module 10 Transmission low speed monitoring signal, Rx1 is the reception service signal of the first optical transceiver module 10, and d (t) 1 is the first optical transceiver module 10 reception low speed monitoring signal;Tx2 is the transmission service signal of the second optical transceiver module 20, and s (t) 2 is the second light transmitting-receiving mould The transmission low speed monitoring signal of block 20, Rx2 is the reception service signal of the second optical transceiver module 20, and d (t) 2 is the transmitting-receiving of the second light The reception low speed monitoring signal of module 20.
The s (t) 1 of carrying low speed monitoring information is loaded into business by the first optical transceiver module 10 by baseband amplitude ovennodulation On signal Tx1 envelope, the bearer service signal (as shown in Figure 7) for the carrying monitoring signal information being modulated into, s (t) 1 and Tx1 Shared optical cable and channel resource, the optical receiving end of the second optical transceiver module 20 is sent to commonly through outside optical communication network 30 Mouthful, the second 20 pairs of optical transceiver module modulated signal received is demodulated, and reception service signal Rx2 and reception are recovered respectively Low speed monitoring signal d (t) 2.Similarly, the s (t) 2 for carrying low speed monitoring information is passed through baseband amplitude by the second optical transceiver module 20 Ovennodulation is loaded on service signal Tx2 envelope, and s (t) 2 and Tx2 shares optical cable and channel resource, logical commonly through exterior light Communication network 30 is sent to the light-receiving port of the first optical transceiver module 10, the modulated signal that the first 10 pairs of optical transceiver module is received It is demodulated, reception service signal Rx1 is recovered respectively and low speed monitoring signal d (t) 1 is received.
In summary, according to the disclosure of the present invention, can accomplish the end in view there is provided the band based on amplitude modulation(PAM) The optical module of interior transparent transmission monitoring signal, can be with the transparent transmission problem of cost-effective solution in band supervisory signal, with high production Industry value.
The optical module of the interior transparent transmission monitoring signal of the band based on amplitude modulation(PAM), both can be applied to design optical transceiver module, It can also be applied to the other products based on the program.
Described above and accompanying drawing are only for illustrating embodiments of the invention, all those skilled in the art, not departing from In the scope of the invention that attached claims are limited, still the present invention can be made a variety of changes in the form and details, its Without departing from the technology and spirit of the present invention.

Claims (5)

1. a kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM), it is characterised in that:The optical module, including hair Send unit and receiving unit;The transmitting element, including for base band supervisory signal to be modulated into low-speed voltage modulated signal Low frequency base band amplitude overmodulated circuit (14), the laser for low-speed voltage modulated signal to be transformed into low speed current modulated Device drive circuit (13), the laser (11) for loading low speed current modulated, for by service signal generation at a high speed electricity The electric absorption signal modulation circuit (15) of pulse signal, for by high speed electric impulse signal control whether absorb by laser (11) The electroabsorption modulator (12) of the light wave sent;The receiving unit, including for receiving the optical signal from outside optical-fiber network And convert optical signals into the avalanche photodide (21) of current signal, for main road current pulse signal to be converted into voltage The trsanscondutance amplifier (23) of pulse signal, the limiting amplifier for recovering reception service signal to voltage pulse signal shaping (24), for branch current signal to be transformed into the circuit mirror current of the current pulse signal proportional to main road current signal (22) the low frequency demodulator circuit (25) of base band low speed monitoring signal, is received for current pulse signal to be demodulated;
Wherein, the low frequency base band amplitude overmodulated circuit (14) is connected by laser driving circuit (13) and laser (11) Connect, the electric absorption signal modulation circuit (15) is connected with electroabsorption modulator (12), the laser (11) is adjusted with electric absorption Device (12) connection processed;A wherein output port for the avalanche photodide (21) is put by trsanscondutance amplifier (23) with amplitude limit Big device (24) connection, another output port of the avalanche photodide (21) passes through circuit mirror current (22) and low frequency solution Adjust circuit (25) connection.
2. a kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM) according to claim 1, its feature exists In:The low frequency base band amplitude overmodulated circuit (14), including for determining the modulation depth of baseband amplitude ovennodulation signal First digital analog converter (141) and the second digital analog converter (142) and for modulating baseband amplitude ovennodulation signal amplitude Amplitude modulator (143);
Wherein, the output of first digital analog converter (141) and the output of the second digital analog converter (142) connect described respectively The input of amplitude modulator (143).
3. a kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM) according to claim 1, its feature exists In:The low frequency demodulator circuit (25), including for filtering out the high frequency service signal in current pulse signal with retain low frequency prison Control low-pass filter circuit (251), the mutual conductance amplifying circuit for low-frequency current signal to be converted into low-frequency voltage signal of signal (252) the comparison decision circuit (253) of base band low frequency monitoring signal, is received for low-frequency voltage signal to be recovered;
Wherein, the low-pass filter circuit (251) is connected by mutual conductance amplifying circuit (252) with comparing decision circuit (253).
4. a kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM) according to claim 1, its feature exists In:The circuit mirror current (22) uses mirror current source to produce branch current equal with main road size of current all the way, Or use current sampling circuit to be converted into main road electric current and main road current in proportion by current/voltage translation circuit Voltage signal.
5. a kind of optical communication system, it is characterised in that:Including, the first optical transceiver module (10) and the second optical transceiver module (20), First optical transceiver module (10) is connected by optical communication network (30) with the second optical transceiver module (20);
Wherein, first optical transceiver module (10) and the second optical transceiver module (20) are described in claim any one of 1-4 Optical module.
CN201510440141.XA 2015-07-24 2015-07-24 A kind of optical module of the interior transparent transmission monitoring signal of band based on amplitude modulation(PAM) CN104980225B (en)

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