CN102098099B - Method and device for controlling output light power and optical communication system - Google Patents
Method and device for controlling output light power and optical communication system Download PDFInfo
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- CN102098099B CN102098099B CN200910247015.7A CN200910247015A CN102098099B CN 102098099 B CN102098099 B CN 102098099B CN 200910247015 A CN200910247015 A CN 200910247015A CN 102098099 B CN102098099 B CN 102098099B
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Abstract
The invention discloses a method for controlling output light power, comprising the following steps: receiving a first laser signal, wherein the first laser signal comprises red shift signals and blue shift signals; filtering the first laser signal, filtering and outputting the blue shift signals and a first red shift signal, and reflecting a second red shift signal when the frequency spectrum of the blue shift signal is in a passband and the frequency spectrum of the red shift signal is in a transition zone; receiving the reflected second red shift signal, and carrying out deferred processing on the second red shift signal, so that the phase difference of the second red shift signal and the first red shift signal is odd times of pi; and combining the second red shift signal which is subjected to the deferred processing with the blue shift signals and the first red shift signal so as to output a second laser signal. According to the embodiment, the spectrum width of output signals can be decreased, the extinction ratio of the output signals is increased, the implementation difficulty of a filter can be reduced, and the implementation cost is reduced.
Description
Technical field
The present invention relates to laser technology field, be specifically related to a kind of method, device and optical communication system of controlling Output optical power.
Background technology
In optical fiber telecommunications system, important characteristic comprises undistorted transmission range and receiving sensitivity.Test the sensitivity obtaining at optical sender place and after Optical Fiber Transmission, test poor between the sensitivity obtaining at optical receiver place, be called dispersion penalty.If need to increase undistorted transmission range, can increase optical sender Output optical power, reduce dispersion penalty, improve extinction ratio.Existing directly modulated lasers is in the time of transmitting " 1 " and " 0 " bit, and laser carrier concentration is different, causes variations in refractive index, and when transmitting " 1 " bit, wavelength diminishes, and frequency raises, and is called orchid and moves.When contrary transmitting " 0 " bit, frequency reduces, and is called red shift.The wavelength change of transmitting " 1 " bit and " 0 " bit, is called chirp.In order to improve Output optical power, need to improve bias current, as be greater than the more than 5 times of threshold current, and laser is in saturation condition like this, and output extinction ratio is low, chirp is serious, laser output signal spectrum width broadening, such laser signal transmits in optical fiber, and dispersion penalty is serious, affect receiver sensitivity, undistorted transmission range is reduced.
A kind of method of controlling Output optical power is provided in prior art, the method is mainly by carrying out filtering to the laser signal of laser output, after filtering, export the blue shifting signal of high frequency, low frequency red shift signal in the time of filtering in filtering laser signal, thereby reduce the frequency spectrum of Output of laser signal, improve extinction ratio, increase undistorted transmission range.
Inventor finds in the process of research prior art, and the method for existing control Output optical power requires filter will have very strong Out-of-band rejection, also needs by the blue shifting signal of high frequency simultaneously, make this filter to realize difficulty larger, realize cost high.
Summary of the invention
The invention provides a kind of method, device and optical communication system of the control Output optical power of realizing difficulty that can reduce filter.
The method of the control Output optical power that the embodiment of the present invention provides comprises:
Receive the first laser signal, the first laser signal comprises red shift signal and blue shifting signal;
The first laser signal is carried out to filtering, and the frequency spectrum of blue shifting signal is positioned at passband, and the frequency spectrum of red shift signal is positioned at transition band, and blue shifting signal and the first red shift signal are exported in filtering, reflection the second red shift signal;
The the second red shift signal that receives reflection, carries out delay disposal to the second red shift signal, makes the odd-multiple of the phase place phase difference of pi of the second red shift signal and the first red shift signal;
The second red shift signal after delay disposal and blue shifting signal and the first red shift signal are closed to road output, output the second laser signal.
The embodiment of the present invention also provides a kind of device of controlling Output optical power, comprising:
The first receiving element, for receiving the first laser signal, the first laser signal comprises red shift signal and blue shifting signal;
Filter unit, for the first laser signal is carried out to filtering, the frequency spectrum of blue shifting signal is positioned at passband, and the frequency spectrum of red shift signal is positioned at transition band, and blue shifting signal and the first red shift signal are exported in filtering, reflection the second red shift signal;
The second receiving element, for the second red shift signal of the unit reflection that accepts filter;
Delay cell, for the second red shift signal is carried out to delay disposal, makes the odd-multiple of the phase place phase difference of pi of the second red shift signal and the first red shift signal;
Combiner unit, for closing road output by the second red shift signal after delay disposal and blue shifting signal and the first red shift signal, output the second laser signal.
The embodiment of the present invention also provides a kind of optical communication system, comprise laser and control the device of Output optical power, laser is exported the first laser signal to the device of controlling Output optical power, the device of controlling Output optical power can comprise: the first receiving element, be used for receiving the first laser signal, the first laser signal comprises red shift signal and blue shifting signal;
Filter unit, for the first laser signal is carried out to filtering, the frequency spectrum of blue shifting signal is positioned at passband, and the frequency spectrum of red shift signal is positioned at transition band, and blue shifting signal and the first red shift signal are exported in filtering, reflection the second red shift signal;
The second receiving element, for the second red shift signal of the unit reflection that accepts filter;
Delay cell, for the second red shift signal is carried out to delay disposal, makes the odd-multiple of the phase place phase difference of pi of the second red shift signal and the first red shift signal;
Combiner unit, for closing road output by the second red shift signal after delay disposal and blue shifting signal and the first red shift signal, output the second laser signal.
Compared with prior art, the inventive method embodiment does not need to filter whole red shift signals, just by reflecting part red shift signal, and the second red shift signal to reflection postpones, make the odd-multiple of the phase place phase difference of pi of the first red shift signal and the second red shift signal, and then reduced the red shift signal in the second laser signal after output after the output of He road.Therefore, the embodiment of the present invention not only can reduce the spectrum width of output signal, improves the extinction ratio of output signal, can also make the difficulty that realizes of filter also reduce, and realizes cost and also reduces.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of the embodiment of the method for the control Output optical power that provides of the embodiment of the present invention;
Fig. 2 is the embodiment of the present invention method flow diagram of adjustment time of delay of providing;
Fig. 3 is the method flow diagram of control the first laser signal wavelength of providing of the embodiment of the present invention;
Fig. 4 is the method flow diagram of control the first laser signal power of providing of the embodiment of the present invention;
Fig. 5 is the structural representation of device first embodiment of the control Output optical power that provides of the embodiment of the present invention;
Fig. 6 is the structural representation of device second embodiment of the control Output optical power that provides of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of method and apparatus and optical communication system of controlling Output optical power.The technical scheme of embodiment for a better understanding of the present invention, is described in detail embodiment provided by the invention below in conjunction with accompanying drawing.
Referring to Fig. 1, Fig. 1 is the flow chart of the embodiment of the method for the control Output optical power that provides of the embodiment of the present invention.In embodiments of the present invention, the method for control Output optical power can comprise:
Steps A 1, reception the first laser signal, the first laser signal comprises red shift signal and blue shifting signal.
Concrete, the embodiment of the present invention can receive the first laser signal, and the first laser signal comprises the blue shifting signal of " 1 " bit and the red shift signal of " 0 " bit.
Steps A 2, the first laser signal is carried out to filtering, the frequency spectrum of blue shifting signal is positioned at passband, and the frequency spectrum of red shift signal is positioned at transition band, and blue shifting signal and the first red shift signal are exported in filtering, and reflection the first laser signal is exported the second red shift signal.
Concrete, the embodiment of the present invention can be carried out filtering to the first laser signal receiving, wherein, the frequency spectrum of the blue shifting signal in the first laser signal is positioned at passband, the frequency spectrum of the red shift signal in the first laser signal is positioned at transition band, thereby export blue shifting signal and part red shift signal, the part red shift signal of output is called the first red shift signal in embodiments of the present invention.
In addition, the embodiment of the present invention can also reflect the red shift signal in the first laser signal, and reflection obtains the second red shift signal.
The second red shift signal of steps A 3, reception reflection, carries out delay disposal to the second red shift signal, makes the odd-multiple of the phase place phase difference of pi of the second red shift signal and the first red shift signal.
Concrete, the second red shift signal that the embodiment of the present invention can receive reflection, carries out delay disposal to the second red shift signal, makes the odd-multiple of the phase place phase difference of pi of the first red shift signal and the second red shift signal.
Steps A 4, the second red shift signal after delay disposal and blue shifting signal and the first red shift signal are closed to road output, output the second laser signal.
In embodiments of the present invention, the embodiment of the present invention can be closed road output by the second red shift signal after delay disposal and blue shifting signal and the first red shift signal, output the second laser signal.In the time closing road output, the odd-multiple of the phase place phase difference of pi of the first red shift signal and the second red shift signal, thereby in the second laser signal that makes to export, there is no red shift signal or remaining less red shift signal, the embodiment of the present invention can reduce output signal spectrum width, improves the extinction ratio of output signal.
Compared with prior art, the embodiment of the present invention does not need to filter whole red shift signals, just by reflecting part red shift signal, and the second red shift signal to reflection postpones, make the odd-multiple of the phase place phase difference of pi of the first red shift signal and the second red shift signal, and then reduced the red shift signal in the second laser signal after output after the output of He road.Therefore, the embodiment of the present invention not only can reduce the spectrum width of output signal, improves the extinction ratio of output signal, and the difficulty that realizes of filter also reduces, and realizes cost and also reduces.
In embodiments of the present invention, can be according to the frequency spectrum of the first laser signal, suitable transition band is set, make the equal and opposite in direction of the second red shift signal of the first red shift signal and reflection, and then the size of the second red shift signal after carrying out delay disposal and the first red shift signal also equates, thereby in the second laser signal that makes to export, there is not red shift signal, further improved the extinction ratio of output signal, increased transmission range.
Referring to Fig. 2, Fig. 2 is the embodiment of the present invention method flow diagram of adjustment time of delay of providing.
In embodiments of the present invention, the method for above-mentioned control Output optical power can also comprise:
Step B1, the second laser signal is coupled, output the 3rd laser signal.
Concrete, the embodiment of the present invention can, after output the second laser signal, be coupled to the second laser signal, i.e. and out-coupling part the second laser signal, is called the 3rd laser signal in embodiments of the present invention.
Step B2, adjust time of delay of delay disposal according to the power of the 3rd laser signal, make the odd-multiple of the phase place phase difference of pi of the second red shift signal and the first red shift signal.
In embodiments of the present invention, the power of the 3rd laser signal that the embodiment of the present invention can obtain according to coupling is adjusted the time of delay of delay disposal in above-mentioned steps A3, makes the odd-multiple of the phase place phase difference of pi of the first red shift signal and the second red shift signal.For example, in the case of the increase of output power of the 3rd laser signal, can increase or reduce time of delay, if increase time of delay, when Output optical power also increases, reduce time of delay, until Output optical power reaches the second preset value.The power of the 3rd laser signal that when wherein, the second preset value can be set to the odd-multiple of phase place phase difference of pi of the second red shift signal and the first red shift signal, coupling obtains.
The embodiment of the present invention is by coupling the second laser signal, dynamically adjust time of delay according to the power of the 3rd laser signal, even change at operational environment of laser etc., the odd-multiple that also can guarantee the phase place phase difference of pi of the first red shift signal and the second red shift signal, can adapt to more application scenarios.
Referring to Fig. 3, Fig. 3 is the method flow diagram of control the first laser signal wavelength of providing of the embodiment of the present invention.
In embodiments of the present invention, the method for control the first laser signal wavelength can comprise:
Step C1, the second red shift signal after reflection is coupled, coupling output red shift coupled signal.
Concrete, the embodiment of the present invention can be coupled to the second red shift signal after reflection, and out-coupling part the second red shift signal, is called red shift coupled signal in embodiments of the present invention.
The power P 1 of step C2, detection red shift coupled signal.
Step C3, in the time that P1 is greater than the first preset value, control laser and reduce the wavelength of the first laser signal of output.
Concrete, if the power P detecting 1 is greater than the first preset value, the red shift signal of explanation reflection strengthens, and now the frequency of the first laser signal of output reduces, it is large that the wavelength of the first laser signal becomes, and now controls laser and reduce the wavelength of the first laser signal of output.
Step C4, in the time that P1 is less than the first preset value, control laser and increase the wavelength of the first laser signal of output.
Concrete, if the power P detecting 1 is less than the first preset value, the red shift signal of explanation reflection weakens, and now the frequency of the first laser signal of output increases, the wavelength of the first laser signal diminishes, and now controls the wavelength of the first laser signal of laser increase output.
In embodiments of the present invention, can be by the first suitable preset value be set, for example the first preset value is set to the half of the power of red shift signal, in the time that the wavelength of the first laser signal changes, can automatically adjust the wavelength that makes the first laser signal, and then make the frequency spectrum of the first laser signal and while carrying out filtering the amplitude-frequency characteristic of filter remain and match, therefore the embodiment of the present invention can adapt to more application scenarios, accommodation is wider.
Referring to Fig. 4, Fig. 4 is the method flow diagram of control the first laser signal power of providing of the embodiment of the present invention.
In embodiments of the present invention, the method for control the first laser signal power can comprise:
Step D1, the first laser signal that laser is exported are coupled, coupling output the 4th laser signal.
Concrete, can be coupled to the first laser signal of laser output, coupling output the 4th laser signal.
The power P 2 of step D2, detection the 4th laser signal.
Step D3, in the time that P2 is greater than the 3rd preset value, control laser and reduce the power of the first laser signal of output.
Concrete, if the power P detecting 2 is greater than the 3rd preset value, the power of the first laser signal of explanation output is bigger than normal, now controls laser and reduce the power of the first laser signal of output.
Step D4, in the time that P2 is less than the 3rd preset value, control laser and increase the power of the first laser signal of output.
Concrete, if the power P detecting 2 is less than the 3rd preset value, the power of the first laser signal of explanation output is bigger than normal, now controls the power of the first laser signal of laser increase output.
In embodiments of the present invention, by the 3rd suitable preset value is set, can be in the time that the power of the 4th laser signal changes, automatically adjust the power of the first laser signal of laser output, thereby the power that makes the first laser signal of laser output keeps stable, therefore the embodiment of the present invention can adapt to more application scenarios, and accommodation is wider.
In addition, the embodiment of the present invention also provides a kind of device of controlling Output optical power.Referring to Fig. 5, Fig. 5 is the structural representation of device first embodiment of the control Output optical power that provides of the embodiment of the present invention.Wherein, laser is exported the first laser signal.
In embodiments of the present invention, the device of control Output optical power mainly comprises:
The first receiving element 110, for receiving the first laser signal, the first laser signal comprises red shift signal and blue shifting signal;
Filter unit 120, for the first laser signal is carried out to filtering, the frequency spectrum of blue shifting signal is positioned at passband, and the frequency spectrum of red shift signal is positioned at transition band, and blue shifting signal and the first red shift signal are exported in filtering, reflection the second red shift signal;
The second receiving element 130, for the second red shift signal of the unit reflection that accepts filter;
Delay cell 140, for the second red shift signal is carried out to delay disposal, makes the odd-multiple of the phase place phase difference of pi of the second red shift signal and the first red shift signal;
Combiner unit 150, for closing road output by the second red shift signal after delay disposal and blue shifting signal and the first red shift signal, output the second laser signal.
The device of control Output optical power of the present invention can use in the embodiment of the method for aforementioned control Output optical power, is no longer repeated in this description at this.Compared with prior art, filter unit 120 in the embodiment of the present invention does not need to filter whole red shift signals, just by reflecting part red shift signal, and the second red shift signal to reflection postpones, make the odd-multiple of the phase place phase difference of pi of the first red shift signal and the second red shift signal, and then by the red shift signal having lacked in the second laser signal after output.Therefore, the embodiment of the present invention not only can reduce the spectrum width of output signal, improves the extinction ratio of output signal, and the difficulty that realizes of filter unit 120 also reduces, and realizes cost and also reduces.
In embodiments of the present invention, the device of control Output optical power can also comprise:
The first coupling unit 160, is coupled for the second laser signal that combiner unit 150 is exported, output the 3rd laser signal; And
Delay control unit 170, for adjusting D time of delay according to the power of the 3rd laser signal, makes the odd-multiple of the phase place phase difference of pi of the second red shift signal and the first red shift signal.
The embodiment of the present invention is by increasing the first coupling unit 160 and delay control unit 170, make the device of controlling Output optical power dynamically to adjust time of delay according to the power of the 3rd laser signal, can change at laser works environment etc., also can guarantee the odd-multiple of the phase place phase difference of pi of the first red shift signal and the second red shift signal, thereby adapt to more application scenarios.
In embodiments of the present invention, the device of control Output optical power can also comprise:
The second coupling unit 180, for the second red shift signal of filter unit reflection is coupled, output red shift coupled signal;
The first detecting unit 190, for detection of the power P 1 of red shift coupled signal;
Wavelength control unit 200, in the time that P1 is greater than the first preset value, controls laser and reduces the wavelength of the first laser signal of output, and in the time that P1 is less than the first preset value, control the wavelength of the first laser signal of laser increase output.
The embodiment of the present invention is dynamically adjusted time of delay by increasing delay control unit 170 according to the power of the 3rd laser signal, even change at operational environment of laser etc., also can guarantee the odd-multiple of the phase place phase difference of pi of the first red shift signal and the second red shift signal, thereby adapt to more application scenarios.
In embodiments of the present invention, the device of control Output optical power can also comprise:
The 3rd coupling unit 210, for the first laser signal of laser output is coupled, coupling output the 4th laser signal;
The second detecting unit 220, for detection of the power P 2 of the 4th laser signal;
Power control unit 230, when being greater than the 3rd preset value at P2, controls laser and reduces the power of the first laser signal of output; In the time that P2 is less than the 3rd preset value, control the power of the first laser signal of laser increase output.
In embodiments of the present invention, by increasing power control unit 230, can be in the time that the power of the 4th laser signal changes, automatically adjust the power of the first laser signal of laser output, thereby the power that makes the first laser signal of laser output keeps stable, therefore the embodiment of the present invention can adapt to more application scenarios, and accommodation is wider.
For understanding in more detail the embodiment of the present invention, provide the instantiation of the device of controlling Output optical power below.Referring to Fig. 6, Fig. 6 is the structural representation of device second embodiment of the control Output optical power that provides of the embodiment of the present invention.Wherein, laser is 610, output the first laser signal.
In embodiments of the present invention, the device of control Output optical power comprises: isolator 620, the first coupler 630, the first circulator 640, filter 650, the second circulator 660, the second coupler 670, the 3rd coupler 680, delayer 690, delay control unit 700, wavelength control unit 710 and power control unit 720.
In embodiments of the present invention, filter unit is filter 650, delay cell is delayer 690, combiner unit is the second circulator 660 in embodiments of the present invention, combiner unit can also replace for lens or coupler, the first receiving element and the second receiving element can be first ring shape device 640, now the first laser signal is from No. 1 port input of the first circulator 640, from No. 3 port outputs of the first circulator 640, the second red shift signal is from No. 3 port inputs of the first circulator, from No. 2 port outputs of the first circulator 640.It is pointed out that the first receiving element and the second receiving element can be also that independent mould is determined, and carry out respectively the function that receives the first laser signal and the second red shift signal.
In embodiments of the present invention, isolator 620 does not mate the normal work of the reflections affect laser of generation for preventing light path, the first coupler 630 is coupled out after a part of luminous power, gives power control unit 720 and control the Output optical power of laser, guarantees that the Output optical power of laser is stable.Wherein, power control unit 720 is controlled the process of the power of the first laser signal of laser output and is described in detail in the method for aforementioned control the first laser signal power, no longer repeats at this.
The through connect signal of the first coupler 630, i.e. the first laser signal, gives No. 1 port of the first circulator 640, export from No. 3 ports from the signal of No. 1 port input, and No. 2 ports are isolated port, do not export.The output signal of 3 ports of the first circulator 640 is given filter 650, the red shift signal of filter 650 part reflection " 0 " bits, allow the blue shifting signal of " 1 " bit in signal pass through, the blue shifting signal of its output and the first red shift signal are from No. 1 port input of the second circulator 660.The red shift signal of reflection, i.e. the second red shift signal, from No. 3 port inputs of the first circulator 640, from No. 2 port outputs of the first circulator 640, output signal is given the second coupler 670, the second coupler 670 is coupled after the second red shift signal, export red shift coupled signal to wavelength control unit 710, the temperature of laser 610 is controlled in wavelength control unit 710 according to the power of red shift coupled signal, thereby change the operation wavelength of laser 610, the wavelength of the first laser signal that assurance laser 610 is exported drops on filter 650 edges, the position of the frequency spectrum that makes the blue shifting signal in the first laser signal in filter 650 passbands, and the position of the frequency spectrum of red shift signal in transition band, thereby by blue shifting signal, reflecting part red shift signal.
The straight-through output signal of the second coupler 670 is given after delayer 690 postpones and is given the second circulator 660, the second red shift signal after postponing is inputted from No. 2 ports, the output signal of this road signal and filter 650 is in the linear stack of 1 input port of the second circulator 660, in the time of the odd-multiple of two paths of signals phase place phase difference of pi, two paths of signals subtracts each other, offset, thereby the red shift signal in output signal is 0.The second circulator 660 is connected to a straight-through port of the 3rd coupler 680, the straight-through output port of the 3rd coupler 680 is connected to external fiber, the 3rd laser signal of coupling port output outputs to delay control unit 700, the delay size of delay control unit 700 control lag devices 690, thereby guarantee that two input signals of the second circulator 660 are in the odd-multiple of the phase place phase difference of pi of No. 1 port, the bit red shift signal that then guarantees that the output signal of the second circulator 660 does not have " 0 ".Reduce output signal spectrum width, improved the extinction ratio of output signal.
In embodiments of the present invention, if the transfer rate of the first circulator 640 is T1, the transfer rate of the second coupler 670 is T2, the transfer rate of delayer 690 is T3, the transfer rate of the second circulator 660 is T4, two input signal amplitudes of the second circulator 660 are equated, require filter 650 to meet the red shift signal reflex rate in the first laser signal: h*T1*T2*T3*T4=(1-h)
Calculate h=1/ (1+T1*T2*T3*T4), if T1=T2=T3=T4=0.9, insertion loss is 0.45dB, h=0.6.Require filter 650 to suppress for 4dB outside near 0.04nm outside cut-off frequency, reduced the difficulty that realizes of filter 650, saved and realized cost.
The device of the control the Output optical power above embodiment of the present invention being provided has been described in detail, the embodiment of the present invention also provides a kind of optical communication system, optical communication system comprises the device of laser and control Output optical power, and the device of wherein controlling Output optical power mainly comprises:
The first receiving element, for receiving the first laser signal, the first laser signal comprises red shift signal and blue shifting signal;
Filter unit, for the first laser signal is carried out to filtering, the frequency spectrum of blue shifting signal is positioned at passband, and the frequency spectrum of red shift signal is positioned at transition band, and blue shifting signal and the first red shift signal are exported in filtering, reflection the second red shift signal;
The second receiving element, for the second red shift signal of the unit reflection that accepts filter;
Delay cell, for the second red shift signal is carried out to delay disposal, makes the odd-multiple of the phase place phase difference of pi of the second red shift signal and the first red shift signal;
Combiner unit, for closing road output by the second red shift signal after delay disposal and blue shifting signal and the first red shift signal, output the second laser signal.
In the optical communication system providing in the embodiment of the present invention, filter unit in the device of control Output optical power does not need to filter whole red shift signals, just by reflecting part red shift signal, and the second red shift signal to reflection postpones, make the odd-multiple of the phase place phase difference of pi of the first red shift signal and the second red shift signal, and then by the red shift signal having lacked in the second laser signal after output.Therefore, the embodiment of the present invention not only can reduce the spectrum width of output signal, improves the extinction ratio of output signal, and the difficulty that realizes of controlling the device of Output optical power also reduces, and realizes cost and also reduces.
In optical communication system embodiment of the present invention, control in the device of Output optical power and the device of above-mentioned control Output optical power identical, for example can also comprise the 3rd coupling unit, the second detecting unit and power control unit, the concrete structure of above-mentioned functions module is no longer repeated in this description at this.
It should be noted that, the content such as information interaction, implementation between said apparatus and intrasystem each unit, due to the inventive method embodiment based on same design, particular content can, referring to the narration in the inventive method embodiment, repeat no more herein.
Method, device and the optical communication system of the control the Output optical power above embodiment of the present invention being provided are described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, this description should not be construed as limitation of the present invention.
Claims (9)
1. a method of controlling Output optical power, is characterized in that, comprising:
Receive the first laser signal, described the first laser signal comprises red shift signal and blue shifting signal;
Described the first laser signal is carried out to filtering, and the frequency spectrum of described blue shifting signal is positioned at passband, and the frequency spectrum of described red shift signal is positioned at transition band, the filtering described blue shifting signal of output and the first red shift signal, reflection the second red shift signal;
The the second red shift signal that receives reflection, carries out delay disposal to described the second red shift signal, makes the odd-multiple of the phase place phase difference of pi of described the second red shift signal and described the first red shift signal;
The second red shift signal after delay disposal and described blue shifting signal and the first red shift signal are closed to road output, output the second laser signal;
Described the second laser signal is coupled, output the 3rd laser signal;
Adjust the time of delay of described delay disposal according to the power of described the 3rd laser signal, make the odd-multiple of the phase place phase difference of pi of described the second red shift signal and described the first red shift signal.
2. method according to claim 1, is characterized in that, also comprises:
The second red shift signal after described delay disposal is coupled, coupling output red shift coupled signal;
Detect the power P 1 of described red shift coupled signal;
In the time that described P1 is greater than the first preset value, control laser, so that described laser reduces the wavelength of the first laser signal of its output;
In the time that described P1 is less than the first preset value, control laser, so that described laser increases the wavelength of the first laser signal of its output.
3. method according to claim 1, is characterized in that, before described reception the first laser signal, also comprises:
The first laser signal to laser output is coupled, coupling output the 4th laser signal;
Detect the power P 2 of described the 4th laser signal;
In the time that described P2 is greater than the 3rd preset value, control laser, so that described laser reduces the power of the first laser signal of its output;
In the time that described P2 is less than the 3rd preset value, control laser, so that described laser increases the power of the first laser signal of its output.
4. a device of controlling Output optical power, is characterized in that, comprising:
The first receiving element, for receiving the first laser signal, described the first laser signal comprises red shift signal and blue shifting signal;
Filter unit, for described the first laser signal is carried out to filtering, the frequency spectrum of described blue shifting signal is positioned at passband, and the frequency spectrum of described red shift signal is positioned at transition band, the filtering described blue shifting signal of output and the first red shift signal, reflection the second red shift signal;
The second receiving element, for receiving the second red shift signal of described filter unit reflection;
Delay cell, for described the second red shift signal is carried out to delay disposal, makes the odd-multiple of the phase place phase difference of pi of described the second red shift signal and described the first red shift signal;
Combiner unit, for closing road output by the second red shift signal after delay disposal and described blue shifting signal and the first red shift signal, output the second laser signal;
The first coupling unit, for the second laser signal of described combiner unit output is coupled, output the 3rd laser signal;
Delay control unit, for adjust the time of delay of described delay disposal according to the power of described the 3rd laser signal, makes the odd-multiple of the phase place phase difference of pi of described the second red shift signal and described the first red shift signal.
5. device according to claim 4, is characterized in that, also comprises:
The second coupling unit, for the second red shift signal of described filter unit reflection is coupled, output red shift coupled signal;
The first detecting unit, for detection of the power P 1 of described red shift coupled signal;
Wavelength control unit, for in the time that described P1 is greater than the first preset value, control laser, so that described laser reduces the wavelength of the first laser signal of its output, and in the time that described P1 is less than the first preset value, control laser, so that described laser increases the wavelength of the first laser signal of its output.
6. device according to claim 4, is characterized in that,
Described the first receiving element and described the second receiving element are circulator, the first laser signal is from the first port input of described circulator, from the second port output of circulator, the second red shift signal is from the second port input of described circulator, from the 3rd port output of circulator.
7. device according to claim 4, is characterized in that,
Described combiner unit is lens or coupler or circulator.
8. device according to claim 4, is characterized in that, also comprises:
The 3rd coupling unit, for the first laser signal of laser output is coupled, coupling output the 4th laser signal;
The second detecting unit, for detection of the power P 2 of described the 4th laser signal;
Power control unit, for in the time that described P2 is greater than the 3rd preset value, control laser, so that described laser reduces the power of the first laser signal of its output, and in the time that described P2 is less than the 3rd preset value, control laser, so that described laser increases the power of the first laser signal of its output.
9. an optical communication system, comprises laser, it is characterized in that, also comprises:
The device of the control Output optical power as described in claim 4 to 8 any one;
Described laser is exported the first laser signal to the device of described control Output optical power.
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| CN1136246A (en) * | 1995-03-28 | 1996-11-20 | 皮雷利·卡维有限公司 | Optical telecommunication method providing transmitting and receiving service channel |
| CN101013921A (en) * | 2007-01-12 | 2007-08-08 | 东南大学 | Optical path double-in multi-out splitter of plane light wave with redundant channel |
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| CN1136246A (en) * | 1995-03-28 | 1996-11-20 | 皮雷利·卡维有限公司 | Optical telecommunication method providing transmitting and receiving service channel |
| CN101013921A (en) * | 2007-01-12 | 2007-08-08 | 东南大学 | Optical path double-in multi-out splitter of plane light wave with redundant channel |
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