CN104125019B - A kind of method and apparatus of Differential Quadriphase Shift Keying demodulator locks - Google Patents
A kind of method and apparatus of Differential Quadriphase Shift Keying demodulator locks Download PDFInfo
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- CN104125019B CN104125019B CN201310157425.9A CN201310157425A CN104125019B CN 104125019 B CN104125019 B CN 104125019B CN 201310157425 A CN201310157425 A CN 201310157425A CN 104125019 B CN104125019 B CN 104125019B
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Abstract
The present invention is applicable to optical communication field, it is provided that the method and apparatus of a kind of Differential Quadriphase Shift Keying demodulator locks, and described method includes: obtains light Differential Quadriphase Shift Keying signal, and obtains the described smooth Differential Quadriphase Shift Keying signal frequency when undisturbed signal；According to the described smooth Differential Quadriphase Shift Keying signal frequency when undisturbed signal, it is judged that whether described smooth Differential Quadriphase Shift Keying signal comprises polarization interference signal；If comprised, then obtain the frequency of described polarization interference signal；It is the frequency different from the frequency of described polarization interference signal by the frequency configuration of described disturbing signal；The described disturbing signal through arranging is loaded into described smooth Differential Quadriphase Shift Keying signal.The embodiment of the present invention, obtains the light DPQSK frequency when undisturbed signal, is different from the frequency of polarization interference signal by the frequency configuration of disturbing signal so that the frequency of disturbing signal avoids the frequency of polarization interference signal, it is achieved the locking of light DPQSK wavelength.
Description
Technical field
The invention belongs to optical communication field, a kind of method particularly relating to Differential Quadriphase Shift Keying demodulator locks
And device.
Background technology
DQPSK(Diffential Quad Phase Shifting Key is called for short Differential Quadriphase Shift Keying) it is a kind of
The modulation format of optical signal, the optical signal modulated by DQPSK form can realize the quick biography of optical signal
Broadcast.When using DQPSK to modulate optical signal, it is necessary to the wavelength of locking optical signal, just can realize light
The DQPSK modulation of signal.
Prior art can realize the wavelength locking of optical DQPSK signal by disturbing signal, but when light is believed
Number the frequency of frequency and disturbing signal of polarization interference signal same or like time, polarization interference signal will
Wavelength locking to light Differential Quadriphase Shift Keying signal causes strong influence, even makes described smooth difference four phase
The wavelength of shift keyed signals cannot lock.
Summary of the invention
The purpose of the embodiment of the present invention is to provide method and the dress of a kind of Differential Quadriphase Shift Keying demodulator locks
Put, with solve prior art because of the frequency of frequency and the disturbing signal of the polarization interference signal of light close time, nothing
The problem that Vinculum iuris determines the wavelength of optical DQPSK signal.
The embodiment of the present invention is achieved in that first aspect, embodiments provides a kind of difference four
The method of phase shift keying demodulator locking, said method comprising the steps of:
Obtain light Differential Quadriphase Shift Keying signal, and obtain described smooth Differential Quadriphase Shift Keying signal at undisturbed
Frequency during signal, described smooth Differential Quadriphase Shift Keying signal is the light after Differential Quadriphase Shift Keying is modulated
Signal；
According to the described smooth Differential Quadriphase Shift Keying signal frequency when undisturbed signal, it is judged that described smooth difference
Whether quadriphase PSK signal comprises polarization interference signal；
If comprised, then obtain the frequency of described polarization interference signal；
It is the frequency different from the frequency of described polarization interference signal by the frequency configuration of described disturbing signal；
The described disturbing signal through arranging is loaded into described smooth Differential Quadriphase Shift Keying signal, with according to institute
State the disturbing signal through arranging and lock the wavelength of described smooth Differential Quadriphase Shift Keying signal.
In the first optional embodiment of first aspect, at described acquisition light Differential Quadriphase Shift Keying signal,
And before obtaining the step of the described smooth Differential Quadriphase Shift Keying signal frequency when undisturbed signal, described side
Method also includes:
Close described disturbing signal.
In the optional embodiment of the second of first aspect, at the described frequency configuration by described disturbing signal
After step for the frequency different from the frequency of described polarization interference signal, described method also includes:
It is fixed frequency by the frequency configuration of the described disturbing signal through arranging, so that in follow-up difference four
In phase shift keying demodulator locking, all use described fixed frequency as the frequency of disturbing signal.
In the third optional embodiment of the first invention, described by the described disturbing signal through arranging
After being loaded into the step of described smooth Differential Quadriphase Shift Keying signal, described method also includes:
Locking time is set, so that when exceeding described locking time, resetting the frequency of described disturbing signal
Rate.
Second aspect, embodiments provides the device of a kind of Differential Quadriphase Shift Keying demodulator locks,
Described device includes:
Acquiring unit, is used for obtaining light Differential Quadriphase Shift Keying signal, and obtains described smooth difference four phase shift key
The control signal frequency when undisturbed signal, described smooth Differential Quadriphase Shift Keying signal is through difference four phase shift
Optical signal after keying modulation；
Judging unit, for the light Differential Quadriphase Shift Keying signal that obtains according to described acquiring unit at undisturbed
Frequency during signal, it is judged that whether described smooth Differential Quadriphase Shift Keying signal comprises polarization interference signal；
Polarization interference signal frequency acquiring unit, for when described judging unit comprises, obtains described polarization
The frequency of interference signal；
Unit is set, is used for the frequency configuration of described disturbing signal as obtaining with described polarization interference signal frequency
Take the frequency that the frequency of the polarization interference signal that unit obtains is different；
Loading unit, for being loaded into described smooth difference four through the described disturbing signal arranging unit setting
Phase shift keyed signal, to lock described smooth Differential Quadriphase Shift Keying letter according to the described disturbing signal through arranging
Number wavelength.
In the first possible embodiment of second aspect, before described acquiring unit obtains, described
Device also includes:
Disturbing signal closing unit, is used for closing described disturbing signal.
In the embodiment that the second of second aspect is possible, described arrange unit arrange after, described
Device also includes:
Fixed frequency arranges unit, for the frequency configuration by passing through the described disturbing signal arranged for fixing frequency
Rate, so that in follow-up light Differential Quadriphase Shift Keying demodulator locks, all using described fixed frequency conduct
The frequency of disturbing signal.
In the third possible embodiment of second aspect, after described loading unit loads, described
Device also includes:
Locking time arranges unit, is used for arranging locking time, so that when exceeding described locking time, weight
The frequency of described disturbing signal is newly set.
The embodiment of the present invention, obtains the light DPQSK frequency when undisturbed signal, it is judged that light DPQSK is
The no polarization interference signal that comprises, and obtain the frequency of polarization interference signal, by the frequency configuration of disturbing signal it is
Different from the frequency of polarization interference signal, disturbing signal is loaded into light DPQSK so that light DPQSK locks
Determine system get polarization interference signal frequency after, the frequency of disturbing signal avoid polarization interference signal
Frequency, it is achieved the locking of light DPQSK wavelength.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below will be to embodiment or existing skill
In art description, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only
It is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying creative labor
On the premise of dynamic property, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The schematic diagram of the Differential Quadriphase Shift Keying demodulator locks method that Fig. 1 provides for the embodiment of the present invention；
The flow chart of the Differential Quadriphase Shift Keying demodulator locks device that Fig. 2 provides for the embodiment of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only should be appreciated that specific embodiment described herein
Only in order to explain the present invention, it is not intended to limit the present invention.
The embodiment of the present invention, obtains the light DPQSK frequency when undisturbed signal, it is judged that light DPQSK is
The no polarization interference signal that comprises, and obtain the frequency of polarization interference signal, by the frequency configuration of disturbing signal it is
Different from the frequency of polarization interference signal, disturbing signal is loaded into light DPQSK so that light DPQSK locks
Determine system get polarization interference signal frequency after, the frequency of disturbing signal avoid polarization interference signal
Frequency, it is achieved the locking of light DPQSK wavelength.
In order to technical solutions according to the invention are described, illustrate below by specific embodiment.
Embodiment one
It is illustrated in figure 1 the flow process of the Differential Quadriphase Shift Keying demodulator locks method that the embodiment of the present invention provides
Figure, said method comprising the steps of:
In step S101, obtain light Differential Quadriphase Shift Keying signal, and obtain described smooth difference four phase shift key
The control signal frequency when undisturbed signal, described smooth Differential Quadriphase Shift Keying signal is through difference four phase shift
Optical signal after keying modulation.
In embodiments of the present invention, DQPSK(Diffential Quad Phase Shifting Key is called for short difference
Quadriphase PSK) it is the modulation format of a kind of optical signal.Disturbing signal is locked out in system for locking light letter
Number the auxiliary signal of wavelength, must use this disturbing signal just can be with locking optical signal in existing technology
Wavelength, disturbing signal can by manually modifying, add, the operation such as removal.Locking system is first
Obtain light Differential Quadriphase Shift Keying signal, and obtain described smooth Differential Quadriphase Shift Keying signal at undisturbed signal
Time frequency, described smooth Differential Quadriphase Shift Keying signal be through Differential Quadriphase Shift Keying modulate after optical signal.
In step s 102, according to the described smooth Differential Quadriphase Shift Keying signal frequency when undisturbed signal,
Judge whether described smooth Differential Quadriphase Shift Keying signal comprises polarization interference signal.
In embodiments of the present invention, locking system is after getting light Differential Quadriphase Shift Keying signal, it is judged that
Whether described smooth Differential Quadriphase Shift Keying signal comprises polarization interference signal.Polarization is a kind of characteristic of optical signal,
The polarization interference signal caused due to polarization, can affect the wavelength locking of light Differential Quadriphase Shift Keying signal.As
Fruit does not comprises, then terminate；If comprised, then enter step S103.
In step s 103, if comprised, then obtain the frequency of described polarization interference signal.
In embodiments of the present invention, if locking system judges that described smooth Differential Quadriphase Shift Keying signal packet is containing partially
Shake interference signal, then obtain the frequency of described polarization interference signal.
In step S104, by the frequency configuration of described disturbing signal it is and the frequency of described polarization interference signal
Different frequencies.
In embodiments of the present invention, same or like when the frequency of disturbing signal and the frequency of polarization interference signal
Time, the wavelength locking of light Differential Quadriphase Shift Keying signal will be caused strong influence by polarization interference signal,
The wavelength even making described smooth Differential Quadriphase Shift Keying signal cannot lock.Therefore get described polarization do
When disturbing the frequency of signal, it is different from the frequency of described polarization interference signal by the frequency configuration of disturbing signal
Frequency.
In step S105, the described disturbing signal through arranging is loaded into described smooth Differential Quadriphase Shift Keying
Signal, to lock the wavelength of described smooth Differential Quadriphase Shift Keying signal according to the described disturbing signal through arranging.
In embodiments of the present invention, will be loaded in locking system, due to disturbance through the disturbing signal arranged
Signal is through arranging so that the frequency of described disturbing signal is different from the frequency of described polarization interference signal, because of
This can realize by the disturbing signal locking to the wavelength of light Differential Quadriphase Shift Keying signal.
The embodiment of the present invention, obtains the light DPQSK frequency when undisturbed signal, it is judged that light DPQSK is
The no polarization interference signal that comprises, and obtain the frequency of polarization interference signal, by the frequency configuration of disturbing signal it is
Different from the frequency of polarization interference signal, disturbing signal is loaded into light DPQSK so that light DPQSK locks
Determine system get polarization interference signal frequency after, the frequency of disturbing signal avoid polarization interference signal
Frequency, it is achieved the locking of light DPQSK wavelength.
As an alternative embodiment of the present invention, at described acquisition light Differential Quadriphase Shift Keying signal, and obtain
Before taking the step of the described smooth Differential Quadriphase Shift Keying signal frequency when undisturbed signal, described method is also
Including:
Close described disturbing signal.
In embodiments of the present invention, locking system is by the method closing disturbing signal, it is achieved obtain described light
The step of the Differential Quadriphase Shift Keying signal frequency when undisturbed signal.
As another alternative embodiment of the invention, the described frequency configuration by described disturbing signal be with
After the step of the different frequency of frequency of described polarization interference signal, described method also includes:
It is fixed frequency by the frequency configuration of the described disturbing signal through arranging, so that in follow-up light difference
In quadriphase PSK demodulator locks, all use described fixed frequency as the frequency of disturbing signal.
In embodiments of the present invention, the frequency configuration of the disturbing signal through arranging can be solid by locking system
Determine frequency, and in follow-up light Differential Quadriphase Shift Keying demodulator locks, the frequency of disturbing signal is all provided with
It is set to described fixed frequency.
As another alternative embodiment of the invention, described, the described disturbing signal through arranging is loaded
After the step of described smooth Differential Quadriphase Shift Keying signal, described method also includes:
Locking time is set, so that when exceeding described locking time, resetting the frequency of described disturbing signal
Rate.
In embodiments of the present invention, in order to avoid locking system is because obtaining the frequency of polarization interference signal,
And the wavelength of light Differential Quadriphase Shift Keying signal cannot be locked for a long time, locking system can set locking time,
When exceeding described locking time, locking system resets the frequency of described disturbing signal.
Embodiment two
It is illustrated in figure 2 the structure of the Differential Quadriphase Shift Keying demodulator locks device that the embodiment of the present invention provides
Figure, for convenience of description, only illustrates the part relevant to the embodiment of the present invention, including:
Acquiring unit 201, is used for obtaining light Differential Quadriphase Shift Keying signal, and obtains described smooth difference four phase
The shift keyed signals frequency when undisturbed signal, described smooth Differential Quadriphase Shift Keying signal is through difference four
Optical signal after phase-shift keying (PSK) modulation.
In embodiments of the present invention, DQPSK(Diffential Quad Phase Shifting Key is called for short difference
Quadriphase PSK) it is the modulation format of a kind of optical signal.Disturbing signal is locked out in system for locking light letter
Number the auxiliary signal of wavelength, must use this disturbing signal just can be with locking optical signal in existing technology
Wavelength, disturbing signal can by manually modifying, add, the operation such as removal.Acquiring unit 201
First obtain light Differential Quadriphase Shift Keying signal, and obtain described smooth Differential Quadriphase Shift Keying signal at undisturbed
Frequency during signal, described smooth Differential Quadriphase Shift Keying signal is the light after Differential Quadriphase Shift Keying is modulated
Signal.
Judging unit 202, for the light Differential Quadriphase Shift Keying signal obtained according to described acquiring unit 201
Frequency when undisturbed signal, it is judged that whether described smooth Differential Quadriphase Shift Keying signal comprises polarization interference letter
Number.
In embodiments of the present invention, locking system is after getting light Differential Quadriphase Shift Keying signal, it is judged that
Unit 202 judges whether described smooth Differential Quadriphase Shift Keying signal comprises polarization interference signal.Polarization is light letter
Number a kind of characteristic, due to polarization cause polarization interference signal, light Differential Quadriphase Shift Keying signal can be affected
Wavelength locking.If do not comprised, then terminate；If comprised, then enter polarization interference signal frequency and obtain
Unit 203 processes.
Polarization interference signal frequency acquiring unit 203, for when described judging unit 202 comprises, obtains
The frequency of described polarization interference signal.
In embodiments of the present invention, if locking system judges that described smooth Differential Quadriphase Shift Keying signal packet is containing partially
Shake interference signal, and polarization interference signal frequency acquiring unit 203 then obtains the frequency of described polarization interference signal.
Unit 204 is set, for by the frequency configuration of described disturbing signal being and described polarization interference signal frequency
The different frequency of frequency of the polarization interference signal that rate acquiring unit 203 obtains.
In embodiments of the present invention, same or like when the frequency of disturbing signal and the frequency of polarization interference signal
Time, the wavelength locking of light Differential Quadriphase Shift Keying signal will be caused strong influence by polarization interference signal,
The wavelength even making described smooth Differential Quadriphase Shift Keying signal cannot lock.Therefore get described polarization do
When disturbing the frequency of signal, unit 204 is set by the frequency configuration of disturbing signal for believing with described polarization interference
Number the different frequency of frequency.
Loading unit 205, for will arrange the disturbing signal that unit 204 arranges be loaded into described through described
Light Differential Quadriphase Shift Keying signal, to lock described smooth difference four phase according to the described disturbing signal through arranging
The wavelength of shift keyed signals.
In embodiments of the present invention, loading unit 205 will be loaded into locking system through the disturbing signal arranged
In, owing to disturbing signal is through arranging so that the frequency of described disturbing signal and described polarization interference signal
Frequency is different, therefore can realize by the disturbing signal locking to the wavelength of light Differential Quadriphase Shift Keying signal.
The embodiment of the present invention, obtains the light DPQSK frequency when undisturbed signal, it is judged that light DPQSK is
The no polarization interference signal that comprises, and obtain the frequency of polarization interference signal, by the frequency configuration of disturbing signal it is
Different from the frequency of polarization interference signal, disturbing signal is loaded into light DPQSK so that light DPQSK locks
Determine system get polarization interference signal frequency after, the frequency of disturbing signal avoid polarization interference signal
Frequency, it is achieved the locking of light DPQSK wavelength.
As an alternative embodiment of the present invention, before described acquiring unit 201 obtains, described device
Also include:
Disturbing signal closing unit, is used for closing described disturbing signal.
In embodiments of the present invention, disturbing signal closing unit closes disturbing signal, to realize obtaining described light
The step of the Differential Quadriphase Shift Keying signal frequency when undisturbed signal.
As another alternative embodiment of the invention, arrange after unit 204 arranges described, described dress
Put and also include:
Fixed frequency arranges unit, for the frequency configuration by passing through the described disturbing signal arranged for fixing frequency
Rate, so that in follow-up light Differential Quadriphase Shift Keying demodulator locks, all using described fixed frequency conduct
The frequency of disturbing signal.
In embodiments of the present invention, fixed frequency arranges unit and can will pass through the frequency of the disturbing signal arranged
It is set to fixed frequency, and in follow-up light Differential Quadriphase Shift Keying demodulator locks, by disturbing signal
Frequency is disposed as described fixed frequency.
As another alternative embodiment of the invention, after described loading unit 205 loads, described dress
Put and also include:
Locking time arranges unit, is used for arranging locking time, so that when exceeding described locking time, weight
The frequency of described disturbing signal is newly set.
In embodiments of the present invention, in order to avoid locking system is because obtaining the frequency of polarization interference signal,
And the wavelength of light Differential Quadriphase Shift Keying signal cannot be locked for a long time, arranging unit locking time can set
Locking time, when exceeding described locking time, locking system resets the frequency of described disturbing signal.
One of ordinary skill in the art will appreciate that the unit included by above-described embodiment is according to merit
Logic can carry out dividing, but be not limited to above-mentioned division, as long as being capable of corresponding function；
It addition, the specific name of each functional unit is also only to facilitate mutually distinguish, it is not limited to the present invention
Protection domain.
Those of ordinary skill in the art it is also understood that, it is achieved all or part of step in above-described embodiment method
Suddenly the program that can be by completes to instruct relevant hardware, and described program can be stored in a calculating
In machine read/write memory medium, described storage medium, including ROM/RAM, disk, CD etc..
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Any amendment, equivalent and the improvement etc. made within bright spirit and principle, should be included in the present invention
Protection domain within.
Claims (8)
1. the method for a Differential Quadriphase Shift Keying demodulator locks, it is characterised in that described method include with
Lower step:
Obtain light Differential Quadriphase Shift Keying signal, and obtain described smooth Differential Quadriphase Shift Keying signal at undisturbed
Frequency during signal, described smooth Differential Quadriphase Shift Keying signal is the light after Differential Quadriphase Shift Keying is modulated
Signal；
According to the described smooth Differential Quadriphase Shift Keying signal frequency when undisturbed signal, it is judged that described smooth difference
Whether quadriphase PSK signal comprises polarization interference signal；
If comprised, then obtain the frequency of described polarization interference signal；
It is the frequency different from the frequency of described polarization interference signal by the frequency configuration of described disturbing signal；
The described disturbing signal through arranging is loaded into described smooth Differential Quadriphase Shift Keying signal, with according to institute
State the disturbing signal through arranging and lock the wavelength of described smooth Differential Quadriphase Shift Keying signal.
2. the method for claim 1, it is characterised in that at described acquisition light Differential Quadriphase Shift Keying
Signal, and before obtaining the step of the described smooth Differential Quadriphase Shift Keying signal frequency when undisturbed signal,
Described method also includes:
Close described disturbing signal.
3. the method for claim 1, it is characterised in that in the described frequency by described disturbing signal
After being set to the step of the frequency different from the frequency of described polarization interference signal, described method also includes:
It is fixed frequency by the frequency configuration of the described disturbing signal through arranging, so that in follow-up difference four
In phase shift keying demodulator locking, all use described fixed frequency as the frequency of disturbing signal.
4. the method for claim 1, it is characterised in that described by the described disturbance through arranging
Signal loading is to after the step of described smooth Differential Quadriphase Shift Keying signal, and described method also includes:
Locking time is set, so that when exceeding described locking time, resetting the frequency of described disturbing signal
Rate.
5. the device of a Differential Quadriphase Shift Keying demodulator locks, it is characterised in that described device includes:
Acquiring unit, is used for obtaining light Differential Quadriphase Shift Keying signal, and obtains described smooth difference four phase shift key
The control signal frequency when undisturbed signal, described smooth Differential Quadriphase Shift Keying signal is through difference four phase shift
Optical signal after keying modulation；
Judging unit, for the light Differential Quadriphase Shift Keying signal that obtains according to described acquiring unit at undisturbed
Frequency during signal, it is judged that whether described smooth Differential Quadriphase Shift Keying signal comprises polarization interference signal；
Polarization interference signal frequency acquiring unit, is used for when the judged result of described judging unit is for comprising,
Obtain the frequency of described polarization interference signal；
Unit is set, is used for the frequency configuration of described disturbing signal as obtaining with described polarization interference signal frequency
Take the frequency that the frequency of the polarization interference signal that unit obtains is different；
Loading unit, for being loaded into described smooth difference four through the described disturbing signal arranging unit setting
Phase shift keyed signal, to lock described smooth Differential Quadriphase Shift Keying letter according to the described disturbing signal through arranging
Number wavelength.
6. device as claimed in claim 5, it is characterised in that before described acquiring unit obtains, institute
State device also to include:
Disturbing signal closing unit, is used for closing described disturbing signal.
7. device as claimed in claim 5, it is characterised in that arrange after unit arranges described, institute
State device also to include:
Fixed frequency arranges unit, for the frequency configuration by passing through the described disturbing signal arranged for fixing frequency
Rate, so that in follow-up light Differential Quadriphase Shift Keying demodulator locks, all using described fixed frequency conduct
The frequency of disturbing signal.
8. device as claimed in claim 5, it is characterised in that after described loading unit loads, institute
State device also to include:
Locking time arranges unit, is used for arranging locking time, so that when exceeding described locking time, weight
The frequency of described disturbing signal is newly set.
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| CN201310157425.9A CN104125019B (en) | 2013-04-28 | 2013-04-28 | A kind of method and apparatus of Differential Quadriphase Shift Keying demodulator locks |
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| CN104125019B true CN104125019B (en) | 2016-09-28 |
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| CN104125019A (en) | 2014-10-29 |
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