CN110192359A - The device and method for tracking optical wavelength - Google Patents
The device and method for tracking optical wavelength Download PDFInfo
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- CN110192359A CN110192359A CN201680091338.XA CN201680091338A CN110192359A CN 110192359 A CN110192359 A CN 110192359A CN 201680091338 A CN201680091338 A CN 201680091338A CN 110192359 A CN110192359 A CN 110192359A
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Abstract
The embodiment of the present application discloses a kind of device for tracking optical wavelength, it include: filter module, for receiving the first optical signal of unknown wavelength, and filtering processing is made to the first optical signal and obtains the second optical signal of two-way, and second optical signal of two-way is exported to photoelectric conversion module；Photoelectric conversion module for receiving second optical signal of two-way, and handles second optical signal of two-way as photoelectric conversion to obtain the first electric signal of two-way, and first electric signal of two-way is exported to control module；Control module, for receiving first electric signal of two-way, and according to the running parameter of first electric signal of two-way adjusting filter module, so as to meet the first preset relation between first electric signal of two-way；Filter module after adjusting running parameter, is also used to receive the third optical signal of tunable laser output, and the 4th optical signal of two-way is obtained after third optical signal is filtered, and the 4th optical signal of two-way is exported to photoelectric conversion module；Photoelectric conversion module is also used to receive the 4th optical signal of two-way, and is handled as photoelectric conversion the 4th optical signal of two-way to obtain the second electric signal of two-way, and second electric signal of two-way is exported to control module；Control module is also used to receive second electric signal of two-way, and the running parameter of tunable laser is adjusted according to second electric signal of two-way, so as to meet the second preset relation between second electric signal of two-way, so that the wavelength of third optical signal is aligned with the wavelength of the first optical signal.
Description
The invention relates to optical communication fields, and more particularly, to a kind of device and method for tracking optical wavelength.
In existing coherent optical communication system, in order to improve receiving sensitivity, increase transmission range, receiving end uses coherent detection technology.In the principle of relevant detection, need to predict the wavelength of transmitting terminal signal light, and by the wavelength regulation of receiving end local oscillator laser to consistent with transmitting terminal wavelength.Wavelength offset is bigger, and Power penalty is bigger.In general, transmitting terminal local oscillator laser is integrated tunable laser assembly (Integrable Tunable Laser Assembly, ITLA), its wavelength can be demarcated by etalon.But in the application of some coherent systems, in order to reduce the cost of transmitting terminal, the light source of no wavelength locker (Wavelength Locker, WL) can be considered as.If transmitting terminal is locked without wave, the wavelength of transmitting terminal laser is uncertain when in use, that is, can be fluctuated in certain wave-length coverage.In this case, realize that the local oscillator laser of receiving end becomes particularly important to the Wavelength-tracking of transmitting terminal signal light.
Summary of the invention
This application provides a kind of device and method for tracking optical wavelength, can be realized the tracking to the wavelength of optical signal.
First aspect, this application provides a kind of devices for tracking optical wavelength, filter module, photoelectric conversion module and control module, filter module is used to receive the first optical signal of unknown wavelength, and filtering processing is made to the first optical signal and respectively obtains the second optical signal of two-way, and second optical signal of two-way is exported to photoelectric conversion module, wherein first electric signal of two-way is one-to-one with second optical signal of two-way；Photoelectric conversion module handles second optical signal of two-way as photoelectric conversion to obtain the first electric signal of two-way, and first electric signal of two-way is exported to control module for receiving second optical signal of two-way；Control module is used to receive first electric signal of two-way, and the running parameter of filter module is adjusted according to first electric signal of two-way, so as to meet the first preset relation between first electric signal of two-way；Filter module after adjusting running parameter, is also used to receive the third optical signal of tunable laser output, and the 4th optical signal of two-way is obtained after third optical signal is filtered, and the 4th optical signal of two-way is exported to photoelectric conversion module；Photoelectric conversion module is also used to receive the 4th optical signal of two-way, and makees to the 4th optical signal of two-way
Photoelectric conversion processing respectively obtains the second electric signal of two-way, and second electric signal of two-way is exported to control module, wherein is one-to-one between second electric signal of two-way and the 4th optical signal of two-way；Control module is also used to receive second electric signal of two-way, and the running parameter of tunable laser is adjusted according to second electric signal of two-way, so as to meet the second preset relation between second electric signal of two-way, so that the wavelength of third optical signal is aligned with the wavelength of the first optical signal.
Here, the first optical signal is the optical signal that transmitting terminal light source issues, and the wavelength of the first optical signal is unknown.Third optical signal is the optical signal that the tunable laser of receiving end issues, and the wavelength of third optical signal is adjustable.By adjusting the running parameter of each device, it is directed at the wavelength of third optical signal and the wavelength of the first optical signal, that is, thinks that the wavelength of third optical signal is equal with the wavelength of the first optical signal.
But, it is contemplated that the deviation in practical operation, it is only a kind of perfect condition that two wavelength are essentially equal, of substantially equal (in other words, approximately equal) to be considered that two wavelength are equal in practical operation.
In the embodiment of the present application, wavelength is equal it is also assumed that being two wavelength alignments.It should be understood that the device of tracking optical wavelength is the tracking in order to realize third optical signal to the wavelength of the first optical signal, that is, ideally, the wavelength of the wavelength of third optical signal and the first optical signal answers essentially equal, deviation zero.It is contemplated that inevitably there is error in practical operation.Therefore, as long as realizing that the wavelength of the wavelength and the first optical signal of third optical signal is of substantially equal here, i.e., it is believed that realizing the tracking of the wavelength of three optical signals to the wavelength of the first optical signal.
In one possible implementation, filter module includes first filter and second filter, first preset relation includes third preset relation and the 4th preset relation, control module is used to adjust the running parameter of first filter, so that the sum of first electric signal of two-way meets third preset relation；Control module is also used to adjust the running parameter of second filter, so that the difference of first electric signal of two-way meets the 4th preset relation.
In one possible implementation, second preset relation includes the 5th preset relation and the 6th preset relation, control module is used for according to second electric signal of two-way, adjust the running parameter of tunable laser, so that the sum of second electric signal of two-way meets the 5th preset relation, the difference of second electric signal of two-way meets the 6th preset relation.
In one possible implementation, first filter is micro-loop filter, second filter is that Mach increases Dare interferometer MZI filter, wherein, micro-loop filter is specifically used for making the first optical signal the first filtering processing, and will export by the first optical signal of the first filtering processing to MZI filter, MZI filter is specifically used for making the second filtering processing to the first optical signal by the first filtering processing, obtains second optical signal of two-way.
In one possible implementation, third preset relation are as follows: the sum of first electric signal of two-way is greater than or equal to the first preset threshold；4th preset relation are as follows: the difference of first electric signal of two-way is less than or equal to the second preset threshold, wherein the first preset threshold is greater than the second preset threshold.
In one possible implementation, the 5th preset relation are as follows: the sum of second electric signal of two-way is greater than or equal to third predetermined threshold value；6th preset relation are as follows: the difference of second electric signal of two-way is less than or equal to the 4th preset threshold, wherein third predetermined threshold value is greater than the 4th preset threshold.
In one possible implementation, device further include: monitoring modular sends feedback signal to control module for monitoring the first optical signal for passing through the first filtering processing, and when the first optical signal by the first filtering processing mutates.
Optionally, monitoring modular can be monitor photo-diode (Monitor Photodiode, MPD).
In one possible implementation, when first electric signal of two-way meets third preset relation, the peak wavelength of the wavelength alignment port the micro-loop filter drop transmittance curve of first optical signal, when first electric signal of two-way meets four preset relations, the corresponding wavelength of intersection point of the transmittance curve of wavelength alignment two output ports of MZI filter of the first optical signal.
In one possible implementation, when second electric signal of two-way meets five preset relations, the peak wavelength of the wavelength alignment port the micro-loop filter drop transmittance curve of third optical signal, when second electric signal of two-way meets six preset relations, the wavelength of third optical signal is directed at the corresponding wavelength of intersection point of the transmittance curve of two output ports of MZI filter.
Second aspect, this application provides a kind of methods for tracking optical wavelength, receive the first optical signal of unknown wavelength, after the first optical signal is filtered, obtain the second optical signal of two-way；Photoelectric conversion processing is made to second optical signal of two-way, respectively obtains the first electric signal of two-way, wherein first electric signal of two-way is one-to-one with second optical signal of two-way；The running parameter that filtering processing is adjusted according to first electric signal of two-way, so as to meet the first preset relation between first electric signal of two-way；Third optical signal, the Wavelength tunable of third optical signal are received, and filtering processing is made to the third optical signal and obtains the 4th optical signal of two-way；Photoelectric conversion processing is made to the 4th optical signal of two-way, respectively obtains the second electric signal of two-way, wherein second electric signal of two-way is one-to-one with the 4th electric signal of two-way；The wavelength that third optical signal is adjusted according to second electric signal of two-way, so as to meet the second preset relation between second electric signal of two-way, so that the wavelength of third optical signal is aligned with the wavelength of the first optical signal.
In one possible implementation, first preset relation includes third preset relation and the 4th preset relation, and, the running parameter of filtering processing is adjusted according to first electric signal of two-way, so as to meet the first preset relation between first electric signal of two-way, comprising: adjusted according to first electric signal of two-way
First running parameter of filtering processing, so that the sum of first electric signal of two-way meets third preset relation；The second running parameter of filtering processing is adjusted according to first electric signal of two-way, so that the difference of first electric signal of two-way meets the 4th preset relation.
Here the first running parameter for adjusting filtering processing can correspond in the device of tracking optical wavelength and adjust the running parameter of first filter.And the second running parameter of filtering processing is adjusted, it can correspond in the device of tracking optical wavelength and adjust the running parameter of second filter.
In one possible implementation, second preset relation includes the 5th preset relation and the 6th preset relation, meet the second preset relation between second electric signal of two-way, it include: that the sum of second electric signal of two-way meets the 5th preset relation, the difference of second electric signal of two-way meets the 6th preset relation.
In one possible implementation, first optical signal is filtered, obtain the second optical signal of two-way, it include: that the first filtering processing is made to the first optical signal, and the second filtering processing is made to the first optical signal after the first filtering processing, second optical signal of two-way is obtained, wherein, first filtering processing is made by micro-loop filter, and the second filtering processing is made by MZI filter.
In one possible implementation, third preset relation are as follows: the sum of first electric signal of two-way is greater than or equal to the first preset threshold, 4th preset relation are as follows: the difference of first electric signal of two-way is less than or equal to the second preset threshold, wherein the first preset threshold is greater than the second preset threshold.
In one possible implementation, 5th preset relation are as follows: the sum of second electric signal of two-way is greater than or equal to third predetermined threshold value, 6th preset relation are as follows: the difference of second electric signal of two-way is less than or equal to the 4th preset threshold, wherein third predetermined threshold value is greater than the 4th preset threshold.
In one possible implementation, this method further include: monitor the first optical signal after the first filtering processing, and when the first optical signal after the first filtering processing mutates, generate feedback signal.
In one possible implementation, when first electric signal of two-way meets third preset relation, the peak wavelength of the wavelength alignment port the micro-loop filter drop transmittance curve of first optical signal, when first electric signal of two-way meets four preset relations, the corresponding wavelength of intersection point of the transmittance curve of wavelength alignment two output ports of MZI filter of the first optical signal.
In one possible implementation, when second electric signal of two-way meets five preset relations, the peak wavelength of the wavelength alignment port the micro-loop filter drop transmittance curve of third optical signal, when second electric signal of two-way meets six preset relations, the wavelength of third optical signal is directed at the corresponding wavelength of intersection point of the transmittance curve of two output ports of MZI filter.
In the embodiment of the present application, control module adjusts filter module by adjustment process twice for the first time
Running parameter so that the wavelength of the optical signal of unknown wavelength is equal with the operation wavelength of filter module.Second of adjusting tunable laser, so that the wavelength of the signal light of tunable laser output is equal with the operation wavelength of filter module, to having achieved the purpose that be directed at the wavelength of laser and the wavelength of the optical signal of unknown wavelength, the laser of receiving end is realized to the Wavelength-tracking of the signal light of the unknown wavelength of transmitting terminal.
Fig. 1 shows the working principle schematic diagram of micro-loop filter.
Fig. 2 shows the working principle schematic diagrams of MZI filter.
Fig. 3 is the schematic diagram of the device 200 of tracking optical wavelength provided by the embodiments of the present application.
Fig. 4 is the schematic flow chart of the method 300 of tracking optical wavelength provided by the embodiments of the present application.
Fig. 5 is an example of the device of tracking optical wavelength provided by the embodiments of the present application.
Fig. 6 is the process schematic of the method for tracking optical wavelength provided by the embodiments of the present application.
With reference to the accompanying drawing, the technical solution of the embodiment of the present application is illustrated.
Technical solution provided by the embodiments of the present application may be applicable to the scene for tracking the wavelength of the signal light of unknown wavelength.For example, receiving end light source usually requires to track the optical wavelength of transmitting terminal light source and (in other words, be aligned) in related optical communication system.Since the wavelength offset of receiving end and transmitting terminal is bigger, and the power of system consumption is bigger.Therefore, the wavelength of receiving end should be made equal with the wavelength of transmitting terminal as far as possible.And in the application of many coherent systems, in order to reduce the cost of transmitting terminal, it will use the light source of not wavelength locker.In this way, the wavelength of the signal light of the sending of transmitting terminal is that fluctuation is uncertain.In this case, if receiving end will keep small as far as possible with the wavelength offset of transmitting terminal, automatically tracking to the optical wavelength of transmitting terminal should be realized.
For this purpose, the embodiment of the present application provides a kind of device and method for tracking optical wavelength, to realize the tracking of the wavelength to the optical signal of unknown wavelength.
Firstly, being briefly described to two filters (micro-loop filter and MZI filter) and its working principle that are related in the embodiment of the present application.
Micro-loop filter
Fig. 1 shows the working principle schematic diagram of micro-loop filter.As shown in Figure 1, micro-loop filter (by taking monocycle as an example) is made of a straight wave guide and a disc waveguide.Specific working principle is as follows:
The port A of signal light from straight wave guide #1 are incident, can intercouple at adjacent rings waveguide (also referred to as micro-loop), so that the signal light in straight wave guide #1 is constantly coupled into micro-loop.Meanwhile the part signal light in micro-loop is also constantly coupled into straight wave guide #1, and is exported by the port B of straight wave guide #1.The signal light for being coupled into micro-loop ceaselessly rotates in micro-loop and resonance occurs, and also intercouples in neighbouring straight wave guide #2, and the part signal light in micro-loop is constantly coupled into straight wave guide #2, and exported by the port C of straight wave guide #2.
In fact, the light of specific wavelength (meeting micro-ring resonant condition) is exported by port C from the light of the incident wavelength range of port A, the light for being unsatisfactory for micro-ring resonant condition is exported from port B.Therefore, the effect of micro-loop filter is mainly used for filtering.That is, the light to specific wavelength plays the role of filtering.
In addition, port D can be also used for inputting the signal light of new wavelength, and exported by port B.
For example, including three wavelength, respectively λ from the light of port A incidence1、λ2And λ3.Wherein, meet a length of λ of light wave of the condition of resonance of micro-loop filter1.Therefore, wavelength λ1Light from port C export, and wavelength be λ2And λ3Optical wavelength from port Β export.Also, if from port D input wavelength be λ4Optical signal, and λ4Meet the condition of resonance of micro-loop filter, then wavelength is λ4Light can be exported from port Β.Therefore, a length of λ of the light wave of port Β final output2、λ3And λ4。
In actual use, port A also referred to as inputs the port (In), and port B also referred to as passes through the port (Through), and port C also referred to as penetrates the port (Drop), and port D also referred to as increases the port (Add).It can be found in Fig. 1.
MZI filter
Also referred to as MZI filter when Mach-increasing Dare interferometer (Mach Zehnder Interferometer, MZI) is used as filter.MZI determines that different wavelength exports using the interference path of two different lengths.
Fig. 2 shows the working principle schematic diagrams of MZI filter.As shown in Fig. 2, there are two input port (port 1 and port 2 as shown in Figure 2) and two output ports (port 3 and port 4 as shown in Figure 2) for MZI filter tool.The optical signal inputted from any one input port, is transmitted along upper input waveguide.When by coupled zone #1, a part of light can be coupled into lower input waveguide.In this way, light can enter the brachium (waveguide) that two length of MZI do not wait.Using the coupling of the coupled zone #2 of upper and lower two output waveguides, exported from two output ports.Since two brachiums of MZI differ, there is certain length difference between the two.Since the effect that the light of different wave length interferes is different, thus filtering can be played the role of.
Below in conjunction with Fig. 3 to Fig. 5, the device of tracking optical wavelength provided by the embodiments of the present application is carried out detailed
It describes in detail bright.
Fig. 3 is the schematic block diagram of the device 200 of tracking optical wavelength provided by the embodiments of the present application.As shown in figure 3, device 200 includes: filter module 210, photoelectric conversion module 220 and control module 230.Wherein, for the optical signal received to be filtered, photoelectric conversion module 220 is used to the optical signal received being converted to electric signal filter module 210.Control module 230 is used for feedback regulation filter module 210, with realization device 200 to the Wavelength-tracking of optical signal.
Below with reference to Fig. 4, the device 200 of tracking optical wavelength is applied to the method 300 of the tracking optical wavelength of application embodiment, is elaborated with the process that the wavelength of the optical signal to unknown wavelength is tracked.
It should be noted that number " first ", " second " are used only for distinguish different objects below.For example, in order to distinguish different optical signal or electric signal.Any restriction should not be constituted to the protection scope of the embodiment of the present application.
Fig. 4 is the schematic flow chart of the method 300 of tracking optical wavelength provided by the embodiments of the present application.As shown in figure 4, method 300 includes step 310-360.
310, filter module receives the first optical signal of unknown wavelength, and makees filtering processing to the first optical signal and obtain the second optical signal of two-way, and second optical signal of two-way is exported to photoelectric conversion module.
It should be noted that the first optical signal here is the unknown optical signal of wavelength, as the target optical signal for needing to be aligned (in other words, tracking).
After the first optical signal is filtered in filter module, the first optical signal is allocated as the second optical signal transmission of two-way to photoelectric conversion module.
320, photoelectric conversion module receives second optical signal of two-way, and makees photoelectric conversion processing to second optical signal of two-way and respectively obtain the first electric signal of two-way, and first electric signal of two-way is exported to control module.
In step 320, photoelectric conversion module makees photoelectric conversion to second optical signal of two-way respectively, so that second optical signal of two-way is converted to two path signal and exports to control module.
First electric signal of two-way is one-to-one with second optical signal of two-way.That is, photoelectric conversion module makees photoelectric conversion processing to the second optical signal all the way, the first electric signal all the way is obtained.Photoelectric conversion processing is made to the second optical signal of another way, obtains the first electric signal of another way.
The embodiment of the present application is not limited in any way the specific implementation of photoelectric conversion module.Both it can voluntarily can also be designed with reference to the structure for being used as photoelectric conversion in the prior art.
Optionally, as one embodiment, photoelectric conversion module may include the first photoelectric conversion unit and the second photoelectric conversion unit, wherein the first photoelectric conversion unit and/or the second photoelectric conversion unit can be by
Photodiode (Photo-Diode, PD) and trans-impedance amplifier (Trans-Impedance Amplifier, TIA) are composed in series.
Specifically, the first photoelectric conversion unit and the second photoelectric conversion unit make photoelectric conversion to second optical signal of two-way respectively, are converted into electric signal output.
It should be understood that the effect of photoelectric conversion module is that the two ways of optical signals exported from filter module is converted to electric signal.Therefore; realize photoelectric conversion only as an example by PD and TIA; those skilled in the art's made simple transformation in this structure basis, or the other structures that can be realized photoelectric conversion effect being readily apparent that, should all fall into the protection scope of the embodiment of the present application.
330, control module receives first electric signal of two-way, and the running parameter of filter module is adjusted according to first electric signal of two-way, so as to meet the first preset relation between first electric signal of two-way.
The running parameter of filter includes but is not limited to operating voltage, operating current etc..Specifically, it should be determined according to the type of filter module.For example, the operation wavelength of filter module can be kept mobile toward the direction to become smaller or the direction to become larger by increasing or reducing the electric current injected in filter module if filter module is electric current tuning.It, can be by increasing or reducing the heating voltage of filter module if filter module is thermal tuning, the direction for becoming smaller or larger its operation wavelength toward wavelength is mobile.
Here, when the first preset relation refers to that the wavelength of input optical signal (i.e. the first optical signal) is aligned with the operation wavelength of filter, the relationship that needs to meet between the first electric signal of two-way.It can elaborate hereinafter.
340, the filter module after adjusting running parameter receives the third optical signal of tunable laser output, makees filtering processing to third optical signal and obtains the 4th optical signal of two-way, and the 4th optical signal of two-way is exported to photoelectric conversion module.
Here third optical signal is the optical signal of tunable laser output.In fact, the method for tracking optical wavelength provided by the embodiments of the present application, it is therefore an objective in the case where the wavelength of the first optical signal is unknown, the wavelength regulation of tunable laser be aligned to the wavelength of the first optical signal.That is, tracking of the wavelength for the optical signal that realization tunable laser issues to the wavelength of the first optical signal.
The specific implementation of step 340 is similar with abovementioned steps 310, is only that the first optical signal of optical signals of processing becomes the third optical signal of tunable laser output.It can be found in the description of step 310 above, details are not described herein again.
350, photoelectric conversion module receives the 4th optical signal of two-way, makees photoelectric conversion processing to the 4th optical signal of two-way and respectively obtains the second electric signal of two-way, and second electric signal of two-way is exported to control module.
It is similar with abovementioned steps 320, reference can be made to the explanation of step 320 above.
Similarly, second electric signal of two-way and the 4th optical signal of two-way are one-to-one.
360, control module receives second electric signal of two-way, and the running parameter of tunable laser is adjusted according to second electric signal of two-way, so as to meet the second preset relation between second electric signal of two-way, so that the wavelength of third optical signal is aligned with the wavelength of the first optical signal.
Similar with the first preset relation, the second preset relation is the wavelength of third optical signal when being aligned with the operation wavelength of filter module, the relationship for needing to meet between the second electric signal of two-way.
It should be understood that the device of tracking optical wavelength is the alignment (that is, equal) in order to realize third optical signal to the wavelength of the first optical signal.That is, in the ideal case, the wavelength of the wavelength of third optical signal and the first optical signal answers essentially equal, deviation zero.It is contemplated that inevitably there is error in practical operation.Therefore, as long as realizing that the wavelength of the wavelength and the first optical signal of third optical signal is of substantially equal (or, approximately equal) here, i.e., it is believed that realizing the tracking of the wavelength of three optical signals to the wavelength of the first optical signal.
310-330 through the above steps, so that the operation wavelength of filter module is aligned with the wavelength of the first optical signal.By step 340-360, so that the wavelength of third optical signal of laser output is aligned with the operation wavelength of filter module.
At this time, it is believed that the wavelength of the first optical signal has reached with the wavelength of third optical signal to be aligned.That is, realizing tracking of the tunable laser to the wavelength of the optical signal of unknown wavelength.
In the embodiment of the present application, the device of optical wavelength is tracked, first by adjusting the running parameter of filter module, so that the wavelength of the optical signal of unknown wavelength is aligned with the operation wavelength of filter module.Again by adjusting the running parameter of tunable laser, so that the wavelength of optical signal of tunable laser output is aligned with the operation wavelength of filter module, so that the output wavelength of tunable laser is aligned with the wavelength of the optical signal of unknown wavelength.So as to realize the optical signal to unknown wavelength wavelength tracking.
Optionally, as one embodiment, filter module includes first filter and second filter, and the first preset condition includes third preset relation and the 4th preset relation, control module is used to adjust the running parameter of first filter, so that the sum of first electric signal of two-way meets third preset relation；Control module is also used to adjust the running parameter of second filter, so that the difference of first electric signal of two-way meets the 4th preset relation.
Specifically, filter module can be made of two filters (that is, first filter and second filter).It is realized at this point, filter module can make filtering processing by first filter, second filter respectively to the filtering processing of optical signal.Meanwhile control module is specially the adjusting of the running parameter to first filter and second filter respectively to the adjusting of filter module.
Optionally, as one embodiment, first filter can be micro-loop filter, and second filter can be MZI filter.
For micro-loop filter, operation wavelength indicates the corresponding wavelength of peak value (hereinafter referred to as peak wavelength) of the port micro-loop filter drop transmittance curve.For MZI filter, operation wavelength indicates the intersection point wavelength of two output port transmittance curves.
Specifically, in the present embodiment, micro-loop filter is specifically used for making the first optical signal the first filtering processing, and it will export by the first optical signal of the first filtering processing to MZI filter, MZI filter is specifically used for making the second filtering processing to the first optical signal by the first filtering processing, obtains second optical signal of two-way.
In addition, first filter can also be other the equal filter constructions for assisting coupler in the same direction using grating.
It take micro-loop filter, second filter as MZI filter of first filter as an example, being given an example to the detailed process of the tracking optical wavelength of the embodiment of the present application below in conjunction with Fig. 5.
Fig. 5 shows the schematic diagram of the device of tracking optical wavelength provided by the embodiments of the present application.As shown in figure 5, the device includes:
Micro-loop filter, including 4 ports, wherein port 1 and port 2 are input port, and port 3 and port 4 are output port.
MZI filter, including 4 ports, wherein port 5 and port 6 are input port, and port 7 and port 8 are output port.
Wherein, 2 output ports of micro-loop filter pass through waveguide with two input ports of MZI filter respectively and connect.As shown in Figure 5, port 3 is connect with port 5, and port 4 is connect with port 6.
Photoelectric conversion module is connect with two output ports of MZI filter by waveguide.
Control circuit is connect with photoelectric conversion module by conducting wire.
The method that optical wavelength is tracked in structure shown in Fig. 5 is described in detail below.
410, micro-loop filter receives the optical signal #1 inputted from port 1, by the first filtering processing, obtains optical signal #2, optical signal #2 is exported from port 3.
Specifically, filtering principle of the optical signal #1 in micro-loop filter may refer to the working principle description to micro-loop filter above, and which is not described herein again.
It should be noted that the port 2 of micro-loop filter is to close always during step 401 executes.Alternatively, tunable laser is that closing is non-luminous.
402, optical signal #2 is input to MZI filter, handles by second filter, obtains two-way
Optical signal (is denoted as optical signal #31 and optical signal #32) respectively, and is exported by the port of MZI filter 7 and port 8.
Specifically, optical signal #2 inputs MZI filter by the waveguide transmission of connectivity port 3 to the port of MZI filter 5, and by port 5.It is transmitted along the upper input waveguide of MZI filter, when by coupled zone 1, by the coupling of neighbouring waveguide, a part of optical signal enters the lower input waveguide of MZI filter.Optical signal #31 and optical signal #32 is exported respectively from port 7 and port 8 to two branches of photoelectric conversion module respectively along the waveguide transmission up and down of MZI filter by the coupling of coupled zone 2.For ease of description, PD1 in Fig. 5 and TIA1 branch constituted is denoted as the first branch, the PD2 and TIA2 branch constituted is denoted as second branch.
403, optical signal #31 is handled along the first branch by photoelectric conversion, obtains electric signal #41, and optical signal #32 is handled along second branch by photoelectric conversion, obtains electric signal #42.Electric signal #41 and electric signal #42 are exported to control circuit.
404, control circuit detects electric signal #41 and electric signal #42, by the running parameter of feedback regulation micro-loop filter and MZI filter, so that electric signal #41 and electric signal #42 meets the first preset relation.It for ease of description, is voltage value as an example, and the two voltage values are denoted as V respectively with first electric signal of two-way (that is, electric signal #41 and electric signal #42)1、V2。
First preset relation includes third preset relation and the 4th preset relation.Control circuit adjusts micro-loop filter, so that V1、V2The sum of meet third preset relation.Make V by adjusting MZI filter again1、V2Difference meet the 4th preset relation.
Specifically, third preset relation are as follows: the sum of first electric signal of two-way is greater than or equal to the first preset threshold.4th preset relation are as follows: the difference of first electric signal of two-way is less than or equal to the second preset threshold.Wherein, the first preset threshold is greater than the second preset threshold.
Third preset relation and the 4th preset relation can be expressed as formula (1) and formula (2).
V1+V2>=the first preset threshold (1)
V1-V2≤ the second preset threshold (2)
Specifically, in step 404, control circuit includes two adjustment processes:
(1) micro-loop filter is adjusted.
Control circuit calculates the sum of the two-way voltage, and by feeding back the voltage signal or current signal for being used to adjust the working condition of micro-loop filter, until the sum of the two-way voltage signal is equal to or more than the first preset threshold.
Here voltage value should be the numerical value after normalization.
In addition, the ideal values of the first preset threshold are the two-way voltage (that is, V1、V2) the sum of maximum value.In view of the error of practical operation, allow the maximum value of the sum of the first preset threshold and the two-way voltage that there can be a lesser deviation.
It should be understood that the light energy of two output ports of MZI filter is equal to the light energy that the input port of micro-loop filter inputs in the case where not considering light energy losses.Therefore, when practical operation, control circuit adjusts the running parameter of micro-loop filter, until the sum of the two-way voltage reaches maximum.At this point, showing that the peak wavelength of the transmittance curve at the end Drop of micro-loop filter is equal with the wavelength of optical signal #1 (theoretically equal, reality can also have certain deviation, that is, reach of substantially equal).
Judge the maximum value of the sum of two-way voltage, can therefrom determine the maximum value in the sum of two-way voltage value by storing the value of the sum of several two-way voltages.
Fig. 6 is the process schematic of the method for tracking optical wavelength provided by the embodiments of the present application.According to the characteristic of micro-loop filter, the transmittance curve of the port Drop is Lorentzian type.In Fig. 6 shown in (a), the curvature near peak wavelength is smaller.Therefore, control circuit is in the running parameter for adjusting micro-loop filter, so that if the wavelength fluctuation range of offset peak wavelength is smaller, transmittance curve will not occur significantly to change during its wavelength is moved toward the direction for becoming larger or becoming smaller.And photodiode (Photo Diode, PD) is also difficult to detect the variation of very faint optical power.Therefore, control circuit adjusts micro-loop filter, can only play the role of coarse adjustment.That is, control circuit can only realize rough tracking by adjusting micro-loop filter.Experiment shows that the tracking accuracy of this process is about several GHz.Hereinafter, tracking accuracy is denoted as frequency deviation Δ f.
In fact, frequency deviation Δ f characterization physical significance be, the wavelength of two ways of optical signals be aligned with the peak wavelength of the transmittance curve of the port micro-loop filter D rop after frequency departure.Referring to Fig. 6, for meeting formula (1) between above-mentioned two-way voltage, when control circuit detects that the sum of two-way voltage value reaches maximum, it could be theoretically argued that the wavelength of the first optical signal (optical signal for needing to track) is targeted by the peak wavelength of the transmittance curve of the port micro-loop filter D rop.But in fact, there may be certain deviations between the wavelength of the first optical signal and the peak wavelength of the transmittance curve of the port Drop at this time, that is, be not essentially equal.Same reason is also likely to be present certain deviation between the peak wavelength of the transmittance curve of the wavelength and port Drop of third optical signal.Deviation on this wavelength is converted to as unit of frequency, is frequency deviation Δ f.
Therefore, in order to realize the tracking of higher precision, it is also necessary to make further alignment (i.e. the process of accurate adjustment) to MZI filter.
(2) MZI filter is adjusted.
Control circuit calculates the two-way voltage (that is, V1、V2) difference, and by feedback one be used to adjust MZI filter working condition voltage signal or current signal, until the two-way difference in voltage be equal to or less than the second preset threshold.
Here the ideal value of the second preset threshold should be taken as 0, that is, control circuit makes two-way difference in voltage be equal to 0 by adjusting MZI filter.At this point, showing that the wavelength of the first optical signal is targeted by the intersection point of the transmittance curve of two output ports of MZI filter.
Certainly, when considering practical operation, inevitably there is error, therefore, the second preset threshold may be set to be a very small numerical value.When the difference of two voltage values is less than the minimum numerical value, it is also contemplated that being substantially aligned with.
It should be noted that, third preset relation and the 4th preset relation represented by formula (1) and formula (2), it can be in synchronization while meeting (i.e., in synchronization, the sum of two-way voltage value is greater than or equal to the first preset threshold, and the difference of the two-way voltage value is less than or equal to the second preset threshold again).Or be also possible to first adjust micro-loop filter, so that the sum of the two-way voltage value at some moment meets formula (1).MZI filter is adjusted again, so that the difference in the two-way voltage value at another moment meets formula (2).
As shown in (b) in Fig. 6, MZI filter has the Free Spectral Range (Free Spectral Range, FSR) of very little, also, the point of intersection of the transmission curve in two output ports, and the slope of curve is maximum.Therefore, faint optical power is that can cause the variation of biggish optical power, it is thus possible to realize the tracking of high-precision optical wavelength (tracking accuracy can be higher than 1000MHZ, that is, frequency departure is less than 1000MHZ after the completion of tracking).
Thus, it is easily understood that, since the FSR of MZI filter is smaller, therefore during realizing wavelength rough tracking by micro-loop filter, optical signal and the wavelength of tunable laser need in the same FSR of MZI transmittance curve, and otherwise optical signal and tunable laser can be registered to other point of intersection on two transmittance curves.When therefore, using the scheme of the embodiment of the present application, the FSR of MZI filter should meet: FSR > Δ f (described frequency deviation above).Specifically, it can be made adjustments by changing the perimeter of micro-loop, the perimeter of micro-loop is bigger, and the FSR of MZI is smaller.Conversely, the perimeter of micro-loop is smaller, the FSR of MZI is bigger.
405, tunable laser L0 is opened, is inputted from the port of micro-loop filter 2.
Hereinafter, the laser L0 optical signal issued is denoted as optical signal #4.
406, the portion of energy of optical signal #4 can be exported from the port of micro-loop filter 4, by the waveguide connecting with port 4, the lower input waveguide of MZI filter is input to by port 6, most afterwards through MZI
Two output waveguides up and down enter in photoelectric conversion module from port 7 and port 8 and carry out photoelectric conversion.
Here, by optical signal #4, the two-way voltage (that is, second electric signal of two-way) of output to control circuit is denoted as V after filtering, photoelectric conversion processing3、V4。
407, control circuit feedback regulation tunable laser realizes tunable laser to the Wavelength-tracking of optical signal 1.
In step 407, control circuit to meet the second preset relation between the second electric signal of two-way by adjusting tunable laser.Specifically, the second preset relation includes the 5th preset relation and the 6th preset relation.
Similar with abovementioned steps 404, the feedback regulation of step 407 includes two adjustment processes.
Firstly, control circuit detects two-way voltage V3、V4, calculate and store two-way voltage V3、V4The sum of, by the running parameter of feedback regulation tunable laser L0 (such as, operating voltage or operating current), to increase or reduce the wavelength of laser output, until the sum of two-way voltage is equal to or more than third predetermined threshold value (being denoted as the 5th preset relation).At this point, showing that the wavelength of tunable laser is targeted by the peak wavelength of the end micro-loop filter D rop transmittance curve.
Then, control circuit detects two-way voltage V3、V4Difference, and the wavelength of feedback regulation tunable laser, until two-way TIA voltage V3、V4Difference be less than or equal to the 4th preset threshold (being denoted as the 6th preset relation).At this time, it is believed that the wavelength of the output optical signal of tunable laser is targeted by the intersection point of two output port transmittance curves of MZI.
5th preset relation and the 6th preset relation can be expressed as formula (3) and formula (4).
V3+V4>=third predetermined threshold value (3)
V3-V4≤ the four preset threshold (4)
Similarly, the ideal values of third predetermined threshold value are the two-way voltage (that is, V3、V4) the sum of maximum value.In view of the error of practical operation, allow the maximum value of the sum of third predetermined threshold value and the two-way voltage that there can be a lesser deviation.
The ideal values of 4th preset threshold should be taken as zero.Alternatively, it is similar with the second preset threshold, it may be set to be a very small numerical value, when the two-way voltage is (that is, V3、V4) difference when being less than or equal to the minimum numerical value, that is, think that the two-way voltage meets the 6th preset relation.
Optionally, as one embodiment, the device further include:
Monitoring modular sends feedback signal to control module for monitoring the first optical signal for passing through the first filtering processing, and when the first optical signal by the first filtering processing mutates.
Optionally, monitoring modular can be monitor photo-diode (Monitor Photodiode, MPD).
With continued reference to Fig. 5.In the present embodiment, coupling separates a part of light and enters in MPD in the waveguide that the output port 3 with micro-loop filter is connect, to be monitored to the optical signal exported by port 3.Port 3 export optical signal occur it is biggish mutation (such as, since environment influences the component failure made, or actively adjust the transmitting terminal wavelength made and jump) when, the wavelength of optical signal can deviate the peak wavelength of the port micro-loop filter D rop transmittance graph, at this point, the optical power in MPD can drastically reduce.Therefore, the detection being mutated to optical wavelength may be implemented by introducing MPD.MPD re-starts light tracking by sending a feedback signal to control circuit, in order to which control circuit controls each device.
It should be understood that, in the various embodiments of the application, magnitude of the sequence numbers of the above procedures are not meant that the order of the execution order, and the execution sequence of each process should be determined by its function and internal logic, and the implementation process without coping with the embodiment of the present application constitutes any restriction.
Those of ordinary skill in the art may be aware that unit described in conjunction with the examples disclosed in the embodiments of the present disclosure and algorithm steps, can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Professional technician can use different methods to achieve the described function each specific application, but this realization is it is not considered that exceed scope of the present application.
It is apparent to those skilled in the art that for convenience and simplicity of description, system, the specific work process of device and unit of foregoing description can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods may be implemented in other ways.Such as, the apparatus embodiments described above are merely exemplary, such as, the division of the unit, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed mutual coupling, direct-coupling or communication connection can be through some interfaces, the indirect coupling or communication connection of device or unit, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, and component shown as a unit may or may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can some or all of the units may be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
In addition, each functional unit in each embodiment of the application can integrate in one processing unit, it is also possible to each unit and physically exists alone, one can also be integrated in two or more units
In a unit.
If the function is realized in the form of SFU software functional unit and when sold or used as an independent product, can store in a computer readable storage medium.Based on this understanding, substantially the part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products the technical solution of the application in other words, the computer software product is stored in a storage medium, it uses including some instructions so that a computer equipment (can be personal computer, server or the network equipment etc.) execute each embodiment the method for the application all or part of the steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), the various media that can store program code such as magnetic or disk.
It should be understood that, in the various embodiments of the application, magnitude of the sequence numbers of the above procedures are not meant that the order of the execution order, and the execution sequence of each process should be determined by its function and internal logic, and the implementation process without coping with the embodiment of the present application constitutes any restriction.
It is described above; the only specific embodiment of the application, but the protection scope of the application is not limited thereto, and anyone skilled in the art is within the technical scope of the present application; it can easily think of the change or the replacement, should all cover within the scope of protection of this application.Therefore, the protection scope of the application should be based on the protection scope of the described claims.
Claims (12)
- A kind of device tracking optical wavelength, which is characterized in that including filter module, photoelectric conversion module and control module,The filter module is used to receive the first optical signal of unknown wavelength, and makees filtering processing to first optical signal and obtain the second optical signal of two-way, and second optical signal of two-way is exported to the photoelectric conversion module；The photoelectric conversion module is for receiving second optical signal of two-way, and photoelectric conversion processing is made to second optical signal of two-way and respectively obtains the first electric signal of two-way, and first electric signal of two-way is exported to the control module, wherein, first electric signal of two-way and second optical signal of two-way are one-to-one；The control module adjusts the running parameter of the filter module according to first electric signal of two-way for receiving first electric signal of two-way, so as to meet the first preset relation between the first electric signal of the two-way；The filter module after adjusting running parameter, it is also used to receive the third optical signal of tunable laser output, and the 4th optical signal of two-way is obtained after the third optical signal is filtered, and the 4th optical signal of two-way is exported to the photoelectric conversion module；The photoelectric conversion module is also used to receive the 4th optical signal of two-way, and photoelectric conversion processing is made to the 4th optical signal of two-way and respectively obtains the second electric signal of two-way, and second electric signal of two-way is exported to the control module, it wherein, is one-to-one between second electric signal of two-way and the 4th optical signal of the two-way；The control module is also used to receive second electric signal of two-way, and the running parameter of the tunable laser is adjusted according to second electric signal of two-way, so as to meet the second preset relation between second electric signal of two-way, so that the wavelength of the third optical signal is aligned with the wavelength of first optical signal.
- The apparatus according to claim 1, which is characterized in that the filter module includes first filter and second filter, and first preset relation includes third preset relation and the 4th preset relation,The control module is used to adjust the running parameter of the first filter, so that the sum of first electric signal of the two-way meets the third preset relation；The control module is also used to adjust the running parameter of the second filter, so that the difference of the first electric signal of the two-way meets the 4th preset relation.
- The apparatus of claim 2, which is characterized in that the first filter is micro-loop Filter, the second filter is that Mach increases Dare interferometer MZI filter, wherein, the micro-loop filter is specifically used for making first optical signal the first filtering processing, and it will export by the first optical signal of the first filtering processing to the MZI filter, the MZI filter is specifically used for making the second filtering processing to the first optical signal by the first filtering processing, obtains second optical signal of two-way.
- Device according to claim 2 or 3, it is characterized in that, the third preset relation are as follows: the sum of described first electric signal of two-way is greater than or equal to the first preset threshold, 4th preset relation are as follows: the difference of first electric signal of two-way is less than or equal to the second preset threshold, wherein, first preset threshold is greater than second preset threshold.
- Device according to claim 3 or 4, which is characterized in that described device further include:Monitoring modular, for monitoring first optical signal by the first filtering processing, and when first optical signal by the first filtering processing mutates, Xiang Suoshu control module sends feedback signal.
- Device according to any one of claim 3 to 5, it is characterized in that, when first electric signal of two-way meets the third preset relation, the wavelength of first optical signal is directed at the peak wavelength of the port micro-loop filter drop transmittance curve, when first electric signal of two-way meets four preset relation, the wavelength of first optical signal is directed at the corresponding wavelength of intersection point of the transmittance curve of two output ports of MZI filter.
- A method of tracking optical wavelength, which is characterized in that the described method includes:The first optical signal of unknown wavelength is received, and first optical signal is filtered, obtains the second optical signal of two-way；Photoelectric conversion processing is made to second optical signal of two-way, respectively obtains the first electric signal of two-way, wherein first electric signal of two-way is one-to-one with second optical signal of two-way；The running parameter of the filtering processing is adjusted according to first electric signal of two-way, so as to meet the first preset relation between the first electric signal of the two-way；Third optical signal, the Wavelength tunable of the third optical signal are received, and filtering processing is made to the third optical signal and obtains the 4th optical signal of two-way；Photoelectric conversion processing is made to the 4th optical signal of two-way, respectively obtains the second electric signal of two-way, wherein second electric signal of two-way is one-to-one with the 4th electric signal of two-way；The wavelength of the third optical signal is adjusted according to second electric signal of two-way, so as to meet the second preset relation between the second electric signal of the two-way, so that the wavelength of the third optical signal is aligned with the wavelength of first optical signal.
- The method according to the description of claim 7 is characterized in that first preset relation includes Third preset relation and the 4th preset relation,And the running parameter that the filtering processing is adjusted according to first electric signal of two-way, so as to meet the first preset relation between the first electric signal of the two-way, comprising:The first running parameter of the filtering processing is adjusted according to first electric signal of two-way, so that the sum of first electric signal of the two-way meets the third preset relation；The second running parameter of the filtering processing is adjusted according to first electric signal of two-way, so that the difference of the first electric signal of the two-way meets the 4th preset relation.
- Method according to claim 7 or 8, which is characterized in that it is described that first optical signal is filtered, obtain the second optical signal of two-way, comprising:First filtering processing is made to first optical signal, and the second filtering processing is made to the first optical signal after the first filtering processing, obtain second optical signal of two-way, wherein, first filtering processing is made by micro-loop filter, and second filtering processing is made by MZI filter.
- Method according to claim 8 or claim 9, it is characterized in that, the third preset relation are as follows: the sum of described first electric signal of two-way is greater than or equal to the first preset threshold, 4th preset relation are as follows: the difference of first electric signal of two-way is less than or equal to the second preset threshold, wherein, first preset threshold is greater than second preset threshold.
- Method according to claim 9 or 10, which is characterized in that the method also includes:First optical signal after the first filtering processing is monitored, and when first optical signal after the first filtering processing mutates, generates feedback signal.
- The method according to any one of claim 8 to 11, it is characterized in that, when first electric signal of two-way meets the third preset relation, the wavelength of first optical signal is directed at the peak wavelength of the port micro-loop filter drop transmittance curve, when first electric signal of two-way meets four preset relation, the wavelength of first optical signal is directed at the corresponding wavelength of intersection point of the transmittance curve of two output ports of MZI filter.
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