CN108809435A - Transmission system is examined in a kind of transmitting terminal of single sideband singal, production method and straight straightening - Google Patents
Transmission system is examined in a kind of transmitting terminal of single sideband singal, production method and straight straightening Download PDFInfo
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- CN108809435A CN108809435A CN201810542242.1A CN201810542242A CN108809435A CN 108809435 A CN108809435 A CN 108809435A CN 201810542242 A CN201810542242 A CN 201810542242A CN 108809435 A CN108809435 A CN 108809435A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
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Abstract
The invention discloses a kind of transmitting terminal of single sideband singal, production method and straight straightening to examine Transmission system, is related to optical fiber telecommunications system field.The transmitting terminal includes dual-polarization I/Q modulator and the polarizer.In the I/Q modulator of some polarization state of the dual-polarization I/Q modulator, the roads I, the roads Q analog signal and the light signal of single-side belt are loaded, and bias point is adjusted at zero；In the I/Q modulator of another polarization state, load light signal, and its road I, the roads Q port on be not loaded with any electric signal, and the power of the polarization state optical signal is adjusted by adjusting the position of bias point.The polarizer for the optical signal of two polarization states to be mapped to a polarization state, and realizes the adjusting of carrier wave and optical signal power ratio.The present invention can effectively utilize the power of transmitting signal, and energy loss is small, and system transmission performance is good.
Description
Technical field
The present invention relates to optical fiber telecommunications system fields, are specifically a kind of transmitting terminal of single sideband singal, production method
And Transmission system is examined in straight straightening.
Background technology
With the increase of transmission capacity in optical fiber telecommunications system, the bottleneck in current optical-fiber network has been transferred into data
In the heart in light network and Metropolitan Area Network (MAN) optical transport network, need to realize at least 100Gb/ using the scheme of low cost in this kind of network
The transmission rate of s, transmission range are at least up to 100 kilometers.Therefore, the mode directly detected is directly modulated in this case
It is to be now subjected to one of the mode at most paid close attention to.However, in order to realize 100 kilometers or more of transmission, since low noise optical fiber is put
The operation wavelength of the needs of big device, optical fiber telecommunications system is needed in 1550nm or so, this also means that use directly receives
In the case of, performance can be influenced by power damage caused by dispersion, this can seriously limit the transmission range of straight straightening check system.
The influence that fibre-optical dispersion is brought can effectively be overcome although with dispersion compensating fiber, but this can also influence the flexible of optical-fiber network
Property, while increasing the cost of fiber transmission link.
To solve the above-mentioned problems, scientific research personnel proposes many methods.Scheme commonplace at present is using unilateral
Mode with modulation：Receiving terminal using carrier wave and signal directly in photodetector by the way of beat frequency, restore electricity after transmission
The electric field of signal is so as to compensating effect caused by dispersion.However, the method that current single sideband singal generates, all
The position that modulator is biased to Linear Points is needed, because to there is light carrier at direct current.Such mode leads to the big of signal
Most power, which all add, to be applied on direct current, to reduce the power utilization and signal-to-noise ratio of signal, there is larger damage to energy consumption
It loses.Therefore, such technical solution has significant limitation in practical applications.
Invention content
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of transmitting terminal of single sideband singal,
Transmission system is examined in production method and straight straightening, can effectively utilize the power of transmitting signal, energy loss is small, system transporting
It can be good.
To achieve the above objectives, the technical solution adopted by the present invention is that：A kind of transmitting terminal of single sideband singal is provided, including
The light output end of one dual-polarization I/Q modulator, the dual-polarization I/Q modulator connects a polarizer；The dual-polarization IQ tune
The I/Q modulator of each polarization state of device processed all has three electrical interfaces, corresponds to the roads I, the roads Q and bias point respectively and adjusts；Some
In the I/Q modulator of polarization state, the roads I, the roads Q analog signal and the light signal of single-side belt are loaded, and bias point is adjusted to zero
Place；In the I/Q modulator of another polarization state, load light signal, and its road I, the roads Q port on be not loaded with any electric signal,
And the power of the polarization state optical signal is adjusted by adjusting the position of bias point；The polarizer is used for two polarization states
Optical signal be mapped in a polarization state, and realize the adjusting of carrier wave and optical signal power ratio.
Based on the above technical solution, the transmitting terminal further includes：
One laser for generating light signal, and is input in dual-polarization I/Q modulator；One single sideband modulation mould
Block, the roads I, Q railway digital signals for raw bit stream data to be formed to single-side belt after pretreatment；One digital-to-analogue conversion
Device for the roads I of the single-side belt of formation, Q railway digital signals to be converted to the roads I of single-side belt, the roads Q analog signal, and is input to
In dual-polarization I/Q modulator.
Based on the above technical solution, the sideband difference of the left and right when the single sideband modulation module at fundamental frequency two
When realizing single sideband modulation, and so that two sidebands in left and right are misaligned by keeping guard band here at fundamental frequency, the transmitting terminal
Form the transmitting terminal of Double SSB signal.
Based on the above technical solution, the roads I of the I/Q modulator of another polarization state, on the port on the roads Q, lead to
The resistance for crossing 50 ohm of access, realizes and is not loaded with any electric signal on the port on its road I, the roads Q.
The present invention also provides a kind of production methods of single sideband singal, include the following steps：
The roads I of single-side belt, the roads Q analog signal and light signal are loaded into some polarization of dual-polarization I/Q modulator
In the I/Q modulator of state, and bias point is adjusted at zero, maximizes optical signal power；
Light signal is loaded into the I/Q modulator of another polarization state of dual-polarization I/Q modulator, and in its roads I, Q
Any electric signal is not loaded on the port on road；Position by adjusting bias point adjusts the power of the polarization optical signal；
The optical signal of two polarization states is mapped in a polarization state using the polarizer, and realizes carrier wave and optical signal work(
Rate than adjusting, generate single sideband signals.
Based on the above technical solution, the roads I of the single-side belt, the roads Q analog signal producing method be：Pass through one
Raw bit stream data is formed the roads I, the Q railway digital signals of single-side belt by a single sideband modulation module after pretreatment；Lead to again
A digital analog converter is crossed, the roads I of the single-side belt of formation, Q railway digital signals are converted into the roads I of single-side belt, the roads Q simulation letter
Number, and be input in dual-polarization I/Q modulator.
Based on the above technical solution, the light signal is generated by a laser.
Examine Transmission system the present invention also provides a kind of straight straightening, including the transmitting terminal of single sideband singal as described above and
Receiving terminal；
The receiving terminal includes：First photodetector, for the single sideband signals of reception to be converted to unilateral electrification
Signal；First analog-digital converter, for unilateral charged signal to be converted to corresponding digital signal；Digital signal processing unit is used
Restore raw bit stream data in being demodulated to digital signal.
The present invention also provides another straight straightening to examine Transmission system, includes the transmitting terminal of Double SSB signal as described above
And receiving terminal；The receiving terminal includes：Circulator, fiber grating filter, the first photodetector, the first analog-to-digital conversion
Device, the second photodetector, the second analog-digital converter and digital signal processing unit；
The circulator is used for：The Double SSB optical signal of reception is input in fiber grating filter；And by optical fiber
The reflected left single sideband signals of grating filter are input in the second photodetector；The fiber grating filter is used
In：Partial carrier wave, right single sideband signals in Double SSB optical signal are penetrated, and are input in the first photodetector；
Meanwhile remaining carrier wave, left single sideband signals are reflected back circulator；First photodetector is used for：By right single-side belt
Optical signal is converted to right unilateral charged signal；First analog-digital converter is used for：Right unilateral charged signal is converted to accordingly
Digital signal, and be input in digital signal processing unit；Second photodetector is used for：Left single sideband signals are turned
It is changed to left unilateral charged signal；Second analog-digital converter is used for：Left unilateral charged signal is converted into corresponding digital signal,
And it is input in digital signal processing unit；The digital signal processing unit restores for demodulating digital signal
Raw bit stream data.
The beneficial effects of the present invention are：
The present invention uses dual-polarization I/Q modulator in transmitting terminal, and passes through a polarization state in the dual-polarization I/Q modulator
Upper modulated signal, and modulated signal does not only load carrier wave in another polarization state, to realize the generation of single sideband signals；
Meanwhile in order to realize that the signal of two different polarizations can realize beat frequency in photodetector, in dual-polarization I/Q modulator
Light output end is gone to the signal that two polarize in one polarization state by the way of a polarizer, straight so as to realize
It receives.The power of transmitting signal can be effectively utilized through the above way so that energy loss is small, to effectively promote system
System transmission performance.
Description of the drawings
Fig. 1 is the structural schematic diagram of the transmitting terminal of single sideband singal in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the transmitting terminal of Double SSB signal in another embodiment of the present invention；
Fig. 3 is the structural schematic diagram that Transmission system is examined in straight straightening in the embodiment of the present invention；
Fig. 4 is the structural schematic diagram that Transmission system is examined in straight straightening in another embodiment of the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment invention is further described in detail.
The present invention causes most of power of signal to add to be applied to for single sideband singal producing method in the prior art
On direct current, to reduce the power utilization and signal-to-noise ratio of signal, there is the problem of greater loss to energy consumption.Now provide one kind
Transmission system is examined in transmitting terminal, production method and the straight straightening of single sideband singal, can effectively be utilized the power of transmitting signal, be made
It is small to obtain energy loss, to effective lifting system transmission performance.
The present invention mentality of designing be：Dual-polarization I/Q modulator is used in transmitting terminal, this modulator is current 100Gb/s
The modulator that coherent optical communication system mainly uses, with big, the at low cost feature of shipment amount.The present invention at one by polarizing
Modulated signal in state, and modulated signal does not only load carrier wave on another polarization, to realize the life of single sideband signals
At；Meanwhile in order to realize that the signal of two different polarizations can realize beat frequency in photodetector, in the output end of modulator
By the way of a polarizer, the signal that two polarize is gone in a polarization state, so as to realize direct reception.This
Kind mode can effectively utilize the power of transmitting signal so that energy loss is small, to effective lifting system transmission performance.
It is attached below in conjunction with specification to keep the technical problem to be solved in the present invention, technical solution and advantage clearer
Technical scheme of the present invention is described in detail in figure and specific embodiment.It should be appreciated that described below is preferred
Embodiment only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention, and in the absence of conflict, in the present invention
Embodiment and embodiment in feature can be combined with each other.
Embodiment one
It is shown in Figure 1, present embodiments provide a kind of transmitting terminal of single sideband singal, including a dual-polarization IQ modulation
Device, there are one the polarizers for the light output end connection of the dual-polarization I/Q modulator.
Wherein, the I/Q modulator of each polarization state (X polarization states and Y polarization states) of the dual-polarization I/Q modulator all has
Three electrical interfaces correspond to the roads I, the roads Q and bias point and adjust respectively；In the I/Q modulator of some polarization state, the I of single-side belt is loaded
Road, the roads Q analog signal and light signal, and bias point is adjusted at zero, maximizes optical signal power；Another polarization state
I/Q modulator on, load light signal, and its road I, the roads Q port on be not loaded with any electric signal, and pass through and adjust biasing
The position of point adjusts the power of the polarization optical signal；The polarizer, for the optical signal of two polarization states to be mapped to one
In a polarization state, and realize the adjusting of carrier wave and optical signal power ratio.
For example, in a kind of optional embodiment, in the I/Q modulator of X polarization states, the roads I, the roads Q of single-side belt are loaded
Analog signal and light signal, and bias point is adjusted at zero, to maximize optical signal power；And in Y polarization states
I/Q modulator on load light signal, and its road I, the roads Q port on the resistance of 50 ohm of access indicate no modulated signal,
And by adjusting bias point to linear work point, to control the size of carrier power in Y polarization states.Meanwhile it being set to double inclined
Optical signal in two polarization states of X and Y can be mapped in a polarization state, pass through by the polarizer of I/Q modulator of shaking output end
The bias point in the angle of the polarizer and the I/Q modulator of Y polarization states is modulated, carrier wave may be implemented and the arbitrary of signal power can
It adjusts.The spectrum of the transmitting terminal optical signal, as shown in fig. 1.
Further, shown in Figure 1, the transmitting terminal further includes：One laser, for generating light signal, and
It is input in dual-polarization I/Q modulator；One single sideband modulation module, for by raw bit stream data after pretreatment shape
At the roads I of single-side belt, Q railway digital signals；One digital analog converter, the roads I of the single-side belt for that will be formed, Q railway digital signals
The roads I, the roads the Q analog signal of single-side belt are converted to, and is input in dual-polarization I/Q modulator.
Further, on the basis of the transmitting terminal of above-mentioned single sideband singal, the embodiment of the present invention can also realize one kind
The transmitting terminal of bis- (left and right) single sideband singals.It is similar with the transmitting terminal of single sideband singal, here with dual-polarization I/Q modulator
One of polarization state I/Q modulator realize left and right two sidebands on realize single sideband modulation respectively.Single sideband modulation mould
For block by the pretreated mode of digital signal, the sideband of left and right two at fundamental frequency realizes single sideband modulation, while fundamental frequency respectively
Place keeps certain guard band here and two sidebands in left and right will not be overlapped, and generates crosstalk.Single sideband modulation module then may be used as a result,
The roads I, the Q railway digital signals of two single-side belts in left and right are generated, and is converted to the roads I, the Q of two single-side belts in left and right through digital analog converter
Road analog signal, corresponding transmitting signal electricity frequency spectrum can be found in shown in Fig. 2.The roads I of the single-side belt of the left and right two, the simulation of the roads Q
Signal is input in dual-polarization I/Q modulator, and is realized using the I/Q modulator of one of dual-polarization I/Q modulator polarization state
Single sideband modulation is realized respectively on two sidebands in left and right, so as to generate Double SSB optical signal, corresponding transmitting signal
Spectrum can be found in shown in Fig. 2.
Embodiment two
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of single sideband singal based on above-mentioned transmitting terminal
Production method, the production method include the following steps：
The roads I of single-side belt, the roads Q analog signal and light signal are loaded into some polarization of dual-polarization I/Q modulator
In the I/Q modulator of state, and bias point is adjusted at zero, maximizes optical signal power；
Light signal is loaded into the I/Q modulator of another polarization state of dual-polarization I/Q modulator, and in its roads I, Q
Any electric signal is not loaded on the port on road；Position by adjusting bias point adjusts the power of the polarization optical signal；
The optical signal of two polarization states is mapped in a polarization state using the polarizer, and realizes carrier wave and optical signal work(
Rate than adjusting, generate single sideband signals, that is, emit optical signal.
Further, in a kind of optional embodiment, the roads I of the single-side belt, the producing method of the roads Q analog signal
For：By a single sideband modulation module, raw bit stream data is formed to the roads I, the Q railway digitals of single-side belt after pretreatment
Signal；Again by a digital analog converter, the roads I of the single-side belt of formation, Q railway digital signals are converted into the roads I of single-side belt, Q
Road analog signal, and be input in dual-polarization I/Q modulator.In addition, the light signal is generated by a laser.
Embodiment three
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of straight straightening inspection transmission with above-mentioned transmitting terminal
System.Shown in Figure 3, which includes the transmitting terminal and receiving terminal as described in embodiment one；The receiving terminal includes：The
One photodetector realizes opto-electronic conversion for the single sideband signals of reception to be converted to unilateral charged signal；First mould
Number converter, for unilateral charged signal to be converted to corresponding digital signal；Digital signal processing unit, for digital signal
It is demodulated to restore raw bit stream data.
Further, in a kind of optional embodiment, as shown in figure 4, when the transmitting terminal is that bis- (left and rights) are single
When the transmitting terminal of sideband signals, the receiving terminal of the straight straightening inspection Transmission system further includes：Circulator, fiber grating filter,
Second photodetector and the second analog-digital converter.
Wherein, the circulator is used for：The Double SSB optical signal of reception is input in fiber grating filter, it is right
Shown in the spectrogram answered is as shown in Figure 4；And the reflected left single sideband signals of fiber grating filter are input to
In two photodetectors.The fiber grating filter is used for：By partial carrier wave, the right single-side belt light in Double SSB optical signal
Signal penetrates, and is input in the first photodetector, shown in corresponding spectrogram is as shown in Figure 4；Meanwhile residue being carried
Wave, left single sideband signals are reflected back circulator, shown in corresponding spectrogram is as shown in Figure 4.Second photodetector is used
In：Left single sideband signals are converted into left unilateral charged signal, that is, realize opto-electronic conversion.Second analog-digital converter is used for：It will
Left unilateral charged signal is converted to corresponding digital signal, and is input in digital signal processing unit and is handled.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.
The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (9)
1. a kind of transmitting terminal of single sideband singal, it is characterised in that：The transmitting terminal includes a dual-polarization I/Q modulator, described double
The light output end for polarizing I/Q modulator connects a polarizer；
The I/Q modulator of each polarization state of the dual-polarization I/Q modulator all has three electrical interfaces, corresponds to the roads I, the roads Q respectively
It is adjusted with bias point；In the I/Q modulator of some polarization state, the roads I, the roads Q analog signal and the light source letter of single-side belt are loaded
Number, and bias point is adjusted at zero；In the I/Q modulator of another polarization state, light signal, and the end on its road I, the roads Q are loaded
It is not loaded with any electric signal on mouthful, and adjusts the power of the polarization state optical signal by adjusting the position of bias point；
The polarizer for the optical signal of two polarization states to be mapped to a polarization state, and realizes carrier wave and optical signal
The adjusting of power ratio.
2. the transmitting terminal of single sideband singal as described in claim 1, which is characterized in that the transmitting terminal further includes：
One laser for generating light signal, and is input in dual-polarization I/Q modulator；
One single sideband modulation module, the roads I, Q ways for raw bit stream data to be formed to single-side belt after pretreatment
Word signal；
One digital analog converter, for the roads I of the single-side belt of formation, Q railway digital signals to be converted to the roads I of single-side belt, the roads Q mould
Quasi- signal, and be input in dual-polarization I/Q modulator.
3. the transmitting terminal of single sideband singal as claimed in claim 2, it is characterised in that：When the single sideband modulation module is in base
The sideband of left and right two at frequency realizes single sideband modulation respectively, and makes two sides in left and right by keeping guard band here at fundamental frequency
With it is misaligned when, the transmitting terminal forms the transmitting terminal of Double SSB signal.
4. the transmitting terminal of single sideband singal as claimed any one in claims 1 to 3, it is characterised in that：It is described another partially
On the roads I of the I/Q modulator of polarization state, the port on the roads Q, by accessing 50 ohm of resistance, realize on the port on its road I, the roads Q not
Load any electric signal.
5. a kind of production method of the single sideband singal based on transmitting terminal described in claim 1, which is characterized in that the production method
Include the following steps：
The roads I of single-side belt, the roads Q analog signal and light signal are loaded into some polarization state of dual-polarization I/Q modulator
In I/Q modulator, and bias point is adjusted at zero, maximizes optical signal power；
Light signal is loaded into the I/Q modulator of another polarization state of dual-polarization I/Q modulator, and on its road I, the roads Q
Any electric signal is not loaded on port；Position by adjusting bias point adjusts the power of the polarization optical signal；
The optical signal of two polarization states is mapped in a polarization state using the polarizer, and realizes carrier wave and optical signal power ratio
Adjusting, generate single sideband signals.
6. the production method of single sideband singal as claimed in claim 5, it is characterised in that：The roads I of the single-side belt, the roads Q mould
The producing method of quasi- signal is：By a single sideband modulation module, raw bit stream data is formed to list after pretreatment
The roads I of sideband, Q railway digital signals；Again by a digital analog converter, the roads I of the single-side belt of formation, Q railway digital signals are turned
It is changed to the roads I, the roads the Q analog signal of single-side belt, and is input in dual-polarization I/Q modulator.
7. the production method of single sideband singal as claimed in claim 5, it is characterised in that：The light signal is swashed by one
Light device generates.
8. Transmission system is examined in a kind of straight straightening, it is characterised in that：The system includes transmitting terminal as described in claim 1 and connects
Receiving end；
The receiving terminal includes：First photodetector, for the single sideband signals of reception to be converted to unilateral charged signal；
First analog-digital converter, for unilateral charged signal to be converted to corresponding digital signal；Digital signal processing unit is used for logarithm
Word signal is demodulated to restore raw bit stream data.
9. Transmission system is examined in a kind of straight straightening, it is characterised in that：The system includes transmitting terminal as claimed in claim 3 and connects
Receiving end；The receiving terminal includes：Circulator, fiber grating filter, the first photodetector, the first analog-digital converter, second
Photodetector, the second analog-digital converter and digital signal processing unit；
The circulator is used for：The Double SSB optical signal of reception is input in fiber grating filter；And by fiber grating
The left single sideband signals that filter reflection is returned are input in the second photodetector；
The fiber grating filter is used for：Partial carrier wave, right single sideband signals in Double SSB optical signal are penetrated, and
It is input in the first photodetector；Meanwhile remaining carrier wave, left single sideband signals are reflected back circulator；
First photodetector is used for：Right single sideband signals are converted into right unilateral charged signal；
First analog-digital converter is used for：Right unilateral charged signal is converted into corresponding digital signal, and is input to digital letter
In number processing unit；
Second photodetector is used for：Left single sideband signals are converted into left unilateral charged signal；
Second analog-digital converter is used for：Left unilateral charged signal is converted into corresponding digital signal, and is input to digital letter
In number processing unit；
The digital signal processing unit restores raw bit stream data for being demodulated digital signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810542242.1A CN108809435A (en) | 2018-05-30 | 2018-05-30 | Transmission system is examined in a kind of transmitting terminal of single sideband singal, production method and straight straightening |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810542242.1A CN108809435A (en) | 2018-05-30 | 2018-05-30 | Transmission system is examined in a kind of transmitting terminal of single sideband singal, production method and straight straightening |
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| CN116232471A (en) * | 2023-02-27 | 2023-06-06 | 鹏城实验室 | Polarization multiplexing direct alignment light detection transmission system and method |
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| CN107683572A (en) * | 2015-03-24 | 2018-02-09 | 菲尼萨公司 | Dual-polarization is stable with the automatic bias mutually with orthogonal optical modulator |
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| EP3029512A1 (en) * | 2014-12-02 | 2016-06-08 | Xieon Networks S.à r.l. | Spectral inversion detection for polarization-division multiplexed optical transmission |
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| CN116232471B (en) * | 2023-02-27 | 2024-05-14 | 鹏城实验室 | Polarization multiplexing direct alignment light detection transmission system and method |
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Application publication date: 20181113 |