CN104753590A - Optical module - Google Patents
Optical module Download PDFInfo
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- CN104753590A CN104753590A CN201310730858.9A CN201310730858A CN104753590A CN 104753590 A CN104753590 A CN 104753590A CN 201310730858 A CN201310730858 A CN 201310730858A CN 104753590 A CN104753590 A CN 104753590A
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Abstract
The invention provides an optical module. The optical module comprises a light receiving assembly and a control circuit, wherein the light receiving assembly comprises a filter, a temperature regulating unit and a light receiving sub-unit. The optical module provided by the invention is characterized in that the control circuit is used for monitoring the temperature of the filter, controlling the temperature regulating unit to regulate the temperature of the filter according to a first control signal, and generating a second control signal according to a current signal output by the light receiving sub-unit, namely, the control circuit is used for generating the second control signal according to the power of a light signal selectively output by the filter and controlling the temperature regulating unit to finely adjust the temperature of the filter. The working temperature of the filter and the power of the output light signal are controlled doubly to regulate the temperature of the filter, so that the filter can work on an optimal bandwidth, and the filter can output a light signal of an ideal wavelength selectively.
Description
Technical field
The present invention relates to passive optical network technique, particularly relate to a kind of optical module.
Background technology
EPON (Passive Optical Network is called for short PON) is as Access Network main in current communication network, comparatively ripe at present.At present, stacking time-division wavelength division multiplexing (Time-Wavelength Division Multiplexing, be called for short in TWDM) – PON, optical line terminal (Optical Line Terminal, be called for short OLT) and user's sidelight network element (Optical NetworkUnit, be called for short ONU) between adopt multiple wavelength channel to carry out data transmit-receive, each ONU adopts Wavelength tunable receiving unit to receive the light signal of specific wavelength.
Owing to there is linear relationship between the work of tunable filter device in specific temperature range and temperature, therefore the optical fiber receive module of typical ONU optical module, that tunable optical filter is directly encapsulated in optical fiber receive module, by the working temperature utilizing thermostat unit to regulate filter, realize receiving Wavelength tunable, and in order to reduce the temperature affecting photo-detector when thermostat unit adjusts the temperature of filter as far as possible, also thermostat unit and tunable filter are carried out integral packaging, to be reduced to the temperature impact of photo-detector.
But, by means of only the temperature of the filter in monitor optical receiving unit, adjust the channel wavelength of filter, often cannot realize making filter work in optimal channel bandwidth place, thus make filter cannot realize the light signal selecting to export desired wavelength.
Summary of the invention
The invention provides a kind of optical module, only the temperature of filter being monitored for solving, regulate the channel wavelength of filter, filter cannot be made to export the problem of the light signal of desired wavelength.
The invention provides a kind of optical module, comprising: optical fiber receive module and control circuit;
Described optical fiber receive module comprises filter, thermostat unit and light-receiving subelement, the light signal that described filter is used for receiving carries out wavelength chooses, and the light signal after wavelength chooses is issued described light-receiving subelement, described light-receiving subelement is used for the light signal after the wavelength chooses of reception to be converted into current signal;
Described control circuit, for monitoring the temperature of described filter, and controls the temperature of described thermostat unit to described filter and regulates according to the first control signal preset, to adjust the channel wavelength of described filter;
Described control circuit, the current signal also for exporting according to described light-receiving subelement exports the second control signal, controls described thermostat unit and carries out meticulous adjustment to the temperature of described filter, to adjust the channel wavelength of described filter.
Optical module provided by the invention, control circuit is by the temperature of monitoring filter, and regulate according to the temperature of the first control signal control temperature regulon to filter preset, the current signal exported according to light-receiving subelement more afterwards generates the second control signal, namely select the power of the light signal exported to generate the second control signal according to filter, control temperature regulon carries out meticulous adjustment to the temperature of filter, like this by the two ore control of the power to the working temperature of filter and the light signal of output, the temperature of filter is regulated, filter can be made to be operated in optimum bandwidth place as much as possible, filter is made to select to export the light signal of desired wavelength.
Accompanying drawing explanation
Fig. 1 is the structural representation of ONU optical module embodiment one provided by the invention;
Fig. 2 is the structural representation of ONU optical module embodiment two provided by the invention;
Fig. 3 is monitoring means embodiment electrical block diagram provided by the invention.
Embodiment
Fig. 1 is the structural representation of ONU optical module embodiment one provided by the invention.As shown in Figure 1, this optical module 100, comprising: optical fiber receive module 110 and control circuit 120.
Wherein, optical fiber receive module 110 comprises filter 111, thermostat unit 112 and light-receiving subelement 113.Light signal after wavelength chooses for carrying out wavelength chooses to the light signal received, and is issued light-receiving subelement 113 by filter 110, and light-receiving subelement 113 is for being converted into current signal by the light signal after the wavelength chooses of reception;
Control circuit 120, for monitoring the temperature of filter 111, and regulates according to the temperature of the first control signal control temperature regulon 112 to described filter 111 preset, to adjust the channel wavelength of filter 111;
Control circuit, the current signal also for exporting according to light-receiving subelement 113 exports the second control signal, and the temperature of control temperature regulon 112 pairs of filters 111 carries out meticulous adjustment, to adjust the channel wavelength of described filter.
Concrete, filter in the present embodiment can adopt Mach-Zehnder filter, Fabry-Perot filter, Dielectric thin-film filters, waveguide micro-ring cavity filter, optical fiber Sagnac filter, display waveguide optical grating filter or fiber grating filter etc., does not limit this herein.Thermostat unit in the present embodiment and filter fit tightly setting, and are separated setting with light-receiving subelement, and the light exit window of filter is aimed at light-receiving subelement.
Wherein, the first control signal preset refers to the control signal arranged according to the temperature characterisitic of filter.For example, if the temperature characterisitic of the filter in this optical module is: being operated in 45 ° ~ 50 ° wavelength selecting the light signal exported is λ
1, being operated in 50 ° ~ 55 ° wavelength selecting the light signal exported is λ
2etc., then determining that this optical module needs to select output wavelength to be λ
1light signal time, can determine that need control this filter is operated between 45 ° ~ 50 ° according to the first control signal, then control circuit and the temperature of temperature controllable regulon to filter regulate.
Further, thermostat unit comprises: thermoelectric (al) cooler (Thermo Electric Cooler, be called for short TEC) or heater, filter 111 also comprises thermistor or temperature sensor in addition, for the working temperature of filter is converted to resistance value or voltage, current signal, and export to control circuit 120.
Concrete, control circuit 120 is by monitoring the resistance of thermistor, or the signal that temperature sensor exports is monitored, and according to the resistance value of thermistor and the corresponding relation of temperature, or according to the temperature characterisitic of temperature sensor, determine the Current Temperatures of filter, and the temperature of filter is regulated, if need configure reception wavelength than optical module is λ according to the first control signal control temperature adjustment preset
1, then needing, filter is set and is operated between 45 ° ~ 50 °, and now the temperature of filter is 40 °, then need control TEC or heater to heat filter, on a certain temperature value that filter is operated between 45 ° ~ 50 °.
After light signal after wavelength chooses is sent to light-receiving subelement by filter, the light signal received is converted into current signal by light-receiving subelement, control circuit can also monitor the size of the electric current that light-receiving subelement exports, the size of the power of the light signal that light-receiving subelement receives is judged according to the size of the electric current of light-receiving subelement output, namely judge that filter selects whether the wavelength of the light signal exported is desirable wavelength, and export the second control signal according to current signal, control temperature regulon carries out meticulous adjustment to the temperature of filter, such as, if thermostat unit is 46 ° according to the working temperature of the first control signal adjustment filter, filter selects the wavelength of the light signal exported to be λ
1, and desirable wavelength is λ
1size of current corresponding to light signal be 0.25 milliampere (mA), and by monitoring, control circuit finds that the electric current that light-receiving submodule exports only has 0.2mA, then can determine that now filter is not operated in optimum bandwidth place, namely temperature controllable regulon carries out meticulous adjustment to the temperature of filter, make filter finally be operated in optimum bandwidth place, the wavelength of the light signal of output is desirable wavelength.
The optical module that the present embodiment provides, control circuit is namely by monitoring the current temperature of filter, control temperature regulon regulates the working temperature of filter, the current signal exported according to light-receiving submodule again generates the second control signal, namely select the power of the light signal exported to generate the second control signal according to filter, control temperature regulon carries out meticulous adjustment to the temperature of filter, by the two ore control of the power to the working temperature of filter and the light signal of output, the temperature of filter is regulated, filter can be made to be operated in optimum bandwidth place as much as possible, thus make filter export the light signal of desired wavelength.
Fig. 2 is the structural representation of ONU optical module embodiment two provided by the invention.As shown in Figure 2, the control circuit 120 in the optical module shown in Fig. 1, comprises monitoring means 210 and main control unit 220.
Wherein, monitoring means 210, for monitoring the current signal that light-receiving subelement 113 exports, and is converted to voltage signal and exports to main control unit 220 by current signal;
Main control unit 220, for generating the second control signal according to voltage signal, the temperature of control temperature regulon 112 pairs of filters 111 carries out meticulous adjustment, to adjust the channel wavelength of filter 111.
Further, above-mentioned monitoring means 210, comprising: mirror current source 211 and resistor voltage divider network 212.
Wherein, the current signal that mirror current source exports for monitoring light-receiving subelement, and the image current generated according to current signal is exported to described resistor voltage divider network;
Resistor voltage divider network is used for converting image current to voltage signal, and voltage signal is exported to main control unit.
Usually, mirror current source can export satisfactory direct current, and temperature stability is good, and the impact by factors such as supply voltages is little.Mirror current source is adopted to monitor the current signal of light-receiving subelement output in the present embodiment.
Concrete, filter is selected the wavelength injected, and ensures to only have a wavelength to export.Output wavelength enters light-receiving subelement, such as avalanche photodide (Avalanche Photo Diode, be called for short APD) detector, APD detector is electrooptical device, larger reversed bias voltage is added during work, make it reach avalanche condition, the light of incidence can be changed into electric current and export, incident light is converted into current signal.Utilize the characteristic of mirror current source in the present embodiment, in mirror current source triode can be utilized to provide electric current for APD, then the electric current that another triode in mirror current source exports is the image current of APD output current.
Fig. 3 is the electrical block diagram of monitoring means embodiment provided by the invention.As shown in Figure 3, the mirror current source 211 in this monitoring means 210 comprises the first triode 310, second triode 311, first resistance 312 and the second resistance 313, and light-receiving subelement 113, i.e. photodiode 314.
Wherein, the emitter e 1 of the first triode is connected with the first voltage u1 by the first resistance 312;
The biased electrical press bond of the base stage b1 of the first triode and the b2 base stage of collector electrode c1 and the second triode and light-receiving subelement (i.e. photodiode 314);
The emitter e 2 of the second triode is connected with the first voltage u1 by the second resistance 313;
The collector electrode c2 of the second triode is connected with the first input end of resistor voltage divider network 212.
Wherein, the first triode 310 is the PNP type triode that parameter is identical with the second triode 311.Due to the collector electrode of the first triode 310 and the biased electrical press bond of APD314, for providing bias voltage and output current for APD, therefore in figure, the first voltage u1 need select a larger value according to the operating bias voltage of APD usually.If the electric current that the collector electrode c1 of the first triode 310 exports is I
c1, the electric current that the collector electrode c2 of the second triode 311 exports is I
c2, the first resistance 312 resistance is R1, and the second resistance 313 resistance is R2, then according to the characteristic of mirror current source, and I
c1/ I
c2=R2/R1, namely mirror image proportional for the output current of APD can be exported to resistor voltage divider network 212 by the collector electrode c2 of the second triode 311.
Optionally, the resistance of the first resistance 312 is equal with the resistance of the second resistance 313.Equal by the resistance arranging the first resistance 312 and the second resistance 313, the electric current of input resistor voltage divider network and the output current equal and opposite in direction of APD can be made.
Further, resistor voltage divider network 212, comprises the resistance of multiple mutual series connection.
Wherein, the first input end of resistor voltage divider network 212 is connected with the output of mirror current source, and the second input of resistor voltage divider network 212 is connected to ground;
Between the resistance of multiple mutual series connection, at least one output is set, for voltage signal is exported to main control unit 220.
For example, resistor voltage divider network 212 can comprise the resistance that 2,3 or 4 etc. connect mutually, such as can according to the optional output wavelength number setting of filter device, or can export the different set of maximum current corresponding to the light signal of different wave length or voltage according to filter, the present embodiment does not limit this.
The present embodiment becomes resistor voltage divider network to be described for the resistor group that 3 are connected mutually, then also comprise in Fig. 3: the 3rd resistance the 315, four resistance 316 and the 5th resistance 317.
Wherein, one end of the 3rd resistance 315 is connected with the collector electrode c2 of the second triode 311;
The other end of the 3rd resistance 315 is connected with one end of the 4th resistance 316, as the first output out1 of resistor voltage divider network 212;
The other end of the 4th resistance 316 is connected with one end of the 5th resistance 317, as the second output out2 of resistor voltage divider network 212;
The other end of the 5th resistance 317 is connected with.
Usually, the resistance of the 3rd resistance the 315, four resistance 316 and the 5th resistance 317 can be the same or different, specifically according to the size of APD output current and main control unit 220 need arrange.Resistor voltage divider network 212 is arranged multiple output, the magnitude of voltage that different outputs exports varies in size, can realize when APD output current is less, namely when filter selects the optical signal power of output less, the voltage that main control unit 220 can utilize resistor voltage divider network 212 first output to export, as judging that whether filter bandwidth of operation is the foundation of optimum state, when filter selects the optical signal power exported to increase, in order to protect the input of main control unit 220, the voltage that main control unit 220 can utilize resistor voltage divider network 212 second output to export, as judging that whether filter bandwidth of operation is the foundation of optimum state.Or filter selects the wavelength exported to be λ
1time, the voltage that main control unit 220 can utilize resistor voltage divider network 212 first output to export, as judging that whether filter bandwidth of operation is the foundation of optimum state, filter selects the wavelength exported to be λ
2time, the voltage that main control unit 220 can utilize resistor voltage divider network 212 second output to export, as judging whether filter bandwidth of operation is foundation of optimum state etc., and the present embodiment does not limit this.
Further, in order to protect main control unit 220, voltage restriction branch road can also be set in monitoring means 210.Wherein, voltage restriction branch road is used for limiting the amplitude of the voltage signal that resistor voltage divider network 212 exports.
Concrete, also comprise voltage restriction branch road 213 in the circuit structure of the monitoring means 210 in Fig. 3, this voltage restriction branch road 213 comprises diode 318.
Wherein, the anode of diode 318 is connected with the first output of resistor voltage divider network 212; The negative electrode of diode 318 is connected with the second voltage u2.
For example, the magnitude of voltage of the second voltage u2 can according to main control unit 220 need arrange, can be such as 2.5 volts of (V), 3V or 3.3V etc., the present embodiment limit this.If the second voltage u2 is 3V; the conduction voltage drop of diode 318 is 0.7V; then the maximum voltage that resistor voltage divider network 212 exports can be limited in 3.7V by this voltage restriction branch road 213; thus can ensure that the amplitude of the voltage signal inputed in main control unit 220 can not more than 3.7V; optionally, can also comprise resistance in above-mentioned voltage restriction branch road 213, resistance is connected with diode 318; for limiting the electric current through diode 318, to protect diode 318.
Further, main control unit 220, for generating the second control signal according to voltage signal, comprising:
When main control unit 220 judges voltage signal lower than the threshold value preset, generate the second control signal and control described thermostat unit 112 pairs of filters 111 and heat or cool, to adjust the channel wavelength of filter 111.For example, if when filter works between 45 ° ~ 50 °, the wavelength of optical signal exported is selected to be λ
1, and in this temperature range, a certain temperature value can make filter 111 work in optimum bandwidth place, when filter works in optimum bandwidth place, this wavelength is λ
1the voltage signal magnitude that exports of the first output of the corresponding resistor voltage divider network 212 of light signal be 1V.Then when main control unit 220 is by judging to find that the voltage signal received is 0.98, then can determine that filter 111 selects the wavelength of the light signal exported not to be desired wavelength, namely this filter 111 is not operated in optimum bandwidth place, then can generate the second control signal, control temperature regulon 112 pairs of filters 111 heat or cool.Such as the second control signal control temperature regulon 112 pairs of filters 111 heat, and main control unit 220 is by judging to find that the voltage signal received is lower, then variations in temperature anisotropy is described, then generate the second new control signal, control temperature regulon 112 pairs of filters 111 cool, until the voltage signal that main control unit 220 obtains is default threshold value 1V, then stop regulating the temperature of filter 111, make filter 111 steady operation at the temperature of this correspondence, thus ensure that filter device 111 works in optimum bandwidth place.
Optionally, each voltage signal output end in Fig. 3, the collector output of such as the first triode 310, each output of resistor voltage divider network 212 can arrange an electric capacity over the ground as required, stablize to make the corresponding voltage signal exported everywhere.
The optical module that the present embodiment provides, control circuit is by monitoring the current temperature of filter, control temperature regulon regulates the working temperature of filter, monitoring means is monitored the current signal that light-receiving submodule exports again, namely select the power of the light signal exported to monitor to filter, and monitor signal is exported to main control unit, main control unit is made to generate control signal, control temperature regulon carries out meticulous adjustment to the working temperature of filter, like this by the two ore control of the power to the working temperature of filter and the light signal of output, the temperature of filter is regulated, filter can be made to be operated in optimum bandwidth place as far as possible, thus make filter export the light signal of desired wavelength, achieve the wavelength chooses of optical module to receiving optical signals.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that program command is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. an optical module, is characterized in that, comprising: optical fiber receive module and control circuit;
Described optical fiber receive module comprises filter, thermostat unit and light-receiving subelement, the light signal that described filter is used for receiving carries out wavelength chooses, and the light signal after wavelength chooses is issued described light-receiving subelement, described light-receiving subelement is used for the light signal after the wavelength chooses of reception to be converted into current signal;
Described control circuit, for monitoring the temperature of described filter, and controls the temperature of described thermostat unit to described filter and regulates according to the first control signal preset, to adjust the channel wavelength of described filter;
Described control circuit, the current signal also for exporting according to described light-receiving subelement exports the second control signal, controls described thermostat unit and carries out meticulous adjustment to the temperature of described filter, to adjust the channel wavelength of described filter.
2. optical module according to claim 1, is characterized in that, described control circuit, comprising: monitoring means and main control unit;
Described monitoring means, for monitoring the current signal that described light-receiving subelement exports, and is converted to voltage signal by described current signal and exports to described main control unit;
Described main control unit, for generating the second control signal according to described voltage signal, controlling described thermostat unit and carrying out meticulous adjustment to the temperature of described filter, to adjust the channel wavelength of described filter.
3. optical module according to claim 2, is characterized in that, described monitoring means, comprising: mirror current source and resistor voltage divider network;
Described mirror current source, for monitoring the current signal that described light-receiving subelement exports, and exports to described resistor voltage divider network by the image current generated according to described current signal;
Described resistor voltage divider network, for converting described image current to voltage signal, and exports to described main control unit by described voltage signal.
4. optical module according to claim 3, is characterized in that, described main control unit is used for generating the second control signal according to described voltage signal, comprising:
When described main control unit judges described voltage signal lower than the threshold value preset, generate the second control signal and control described thermostat unit and described filter is heated or cools, to adjust the channel wavelength of described filter.
5. the optical module according to claim 3 or 4, is characterized in that, described mirror current source comprises the first triode, the second triode, the first resistance and the second resistance;
The emitter of described first triode is connected with the first voltage by described first resistance;
The base stage of the base stage of described first triode and collector electrode and described second triode and the biased electrical press bond of described light-receiving subelement;
The emitter of described second triode is connected with described first voltage by described second resistance;
The collector electrode of described second triode is connected with the first input end of described resistor voltage divider network.
6. optical module according to claim 5, is characterized in that, the resistance of described first resistance is equal with the resistance of described second resistance.
7. the optical module according to claim 3 or 4, is characterized in that, described resistor voltage divider network, comprises the resistance of multiple mutual series connection;
The first input end of described resistor voltage divider network is connected with the output of described mirror current source, and the second input of described resistor voltage divider network is connected to ground;
Between the resistance of described multiple mutual series connection, at least one output is set, for voltage signal is exported to described main control unit.
8. optical module according to claim 7, is characterized in that, described monitoring means, also comprises: voltage restriction branch road;
Described voltage restriction branch road, the amplitude for the voltage signal exported described resistor voltage divider network limits.
9. optical module according to claim 8, is characterized in that, described voltage restriction branch road comprises: diode;
The anode of described diode is connected with the first output of described resistor voltage divider network;
The negative electrode of described diode is connected with the second voltage.
10. optical module according to claim 9, is characterized in that, described thermostat unit comprises: thermoelectric (al) cooler or heater.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310730858.9A CN104753590A (en) | 2013-12-26 | 2013-12-26 | Optical module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310730858.9A CN104753590A (en) | 2013-12-26 | 2013-12-26 | Optical module |
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| CN105406912A (en) * | 2015-12-23 | 2016-03-16 | 上海市共进通信技术有限公司 | Received signal strength indication (RSSI) reporting compensation circuit structure for optical line terminal with avalanche photo diode (APD) |
| CN105652379A (en) * | 2016-03-03 | 2016-06-08 | 青岛海信宽带多媒体技术有限公司 | Optical module optical power regulation method and device |
| CN107147513A (en) * | 2016-03-01 | 2017-09-08 | 中兴通讯股份有限公司 | The management method and optical module of a kind of multi-wavelength passive optical network |
| CN108391185A (en) * | 2018-02-12 | 2018-08-10 | 青岛海信宽带多媒体技术有限公司 | A kind of control method of optical module, device and optical module |
| CN114244436A (en) * | 2021-12-17 | 2022-03-25 | 西安电子科技大学 | Adaptive matched filtering system of bandwidth variable light signal and matching method thereof |
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| CN114244436A (en) * | 2021-12-17 | 2022-03-25 | 西安电子科技大学 | Adaptive matched filtering system of bandwidth variable light signal and matching method thereof |
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Application publication date: 20150701 |