CN104717166A - FSK modulating system based on smoothing modulator - Google Patents
FSK modulating system based on smoothing modulator Download PDFInfo
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- CN104717166A CN104717166A CN201510109492.2A CN201510109492A CN104717166A CN 104717166 A CN104717166 A CN 104717166A CN 201510109492 A CN201510109492 A CN 201510109492A CN 104717166 A CN104717166 A CN 104717166A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/12—Modulator circuits; Transmitter circuits
Abstract
The invention discloses a FSK modulating system based on a smoothing modulator. By means of the system, continuous FSK optical signals can be generated to serve as optical labels or optical payload. The FSK modulating system comprises a laser, a LiNbO3 modulator, a random signal generator, a sinusoidal signal generator, two inverters and the smoothing modulator. The laser generates continuous laser, the laser enters the LiNbO3 modulator, and carrier-fictitious subcarriers are output under the drive of sinusoidal signals; the carrier-fictitious subcarriers enter a smoothing modulator module, modulation is conducted under the drive action of data signals, signal light of different frequencies and with intensity being coupled and symmetrical is obtained, and thus required FSK signals are obtained through coupling. According to the system, the FSK signals are obtained through the LiNbO3 modulator and the smoothing modulator module, and compared with an existing FSK modulation mode, the system has the advantages that signal modulation is stable, the influence of external factors is small, and the component amplitude difference of all frequencies is small, accordingly the signal transmission chromatic dispersion influence is small, and the integration level is high.
Description
Technical field
The invention belongs to photoelectron, optical communication field, more specifically, relate to a kind of FSK modulating system based on filtering modulator.
Background technology
Primary modulation form in optical communication comprises: based on amplitude-modulated ASK (Amplitude ShiftKeying, amplitude-shift keying) modulation, based on PSK (the Phase Shift keying of phase-modulation, phase keying) modulation, based on warbled FSK (Frequency Shift keying, frequency keying) modulation, and based on the Polarization Modulation of polarization.Wherein FSK is as a kind of modulating mode proposed recently, owing to having very high transmission tolerance in transmitting procedure; The advantages such as the demodulation mode for fsk signal only needs optical filter, and demodulation is convenient, more and more cause the concern of people.
Existing FSK modulation mode has: (1) output frequency by regulating the control electric current of laser to change laser, to reach the object that different frequency exports, but this kind of mode, owing to controlling the conversion not reaching high speed of electric current, and the restriction of signal response speed, fsk signal speed, lower than 10Gb/s, cannot produce high speed fsk signal.(2) utilize the Mach increasing Dare modulator control that 3 integrated, the pattern of modulating lower sideband respectively produces, but this device is limited to the level of production technology, is difficult to produce this kind of device.(3) two lasers or CSRZ (Carrier SuppressedRetune to Zero is utilized, carrier wave is drawn up NRZ) pattern, produce two subcarriers, by sub-carrier modulation DPSK (Differential Phase Shift Keying, differential phase keying (DPSK)) signal, then signal is sent into time delay interferometer to DPSK demodulation effect, two subcarriers are corresponded respectively to MZDI (Mach-Zehnder Delay Interferometer, Mach increases Dare delay interferometer) output maximum and minimum value, and then produce fsk signal.But this method complicated structure, through repeatedly modulation and demodulation process.
Summary of the invention
For the defect of prior art, the object of the present invention is to provide a kind of FSK modulating system based on filtering modulator, be intended to solve in prior art that in fsk signal, carrier frequency amplitude is unequal, modulation rate is low, the error rate is high and the problem of system complex.
The invention provides a kind of FSK modulating system based on filtering modulator, comprise sinusoidal signal generator, laser, the first inverter, LiNbO
3modulator, data signal generator, the second inverter and filtering modulator; The input of described first inverter is connected to the output of described sinusoidal signal generator, and the output of described first inverter is connected to described LiNbO
3the upper arm control port of modulator; Described LiNbO
3the input of modulator is connected to the output of described laser, described LiNbO
3the underarm control port of modulator is connected to the output of described sinusoidal signal generator; The input of described second inverter is connected to the output of described data signal generator, and the output of described second inverter is connected to the upper arm control end of described filtering modulator, and the input of described filtering modulator is connected to described LiNbO
3the output of modulator, the underarm control port of described filtering modulator is connected to the output of described data signal generator, and the output of described filtering modulator is as the output of FSK modulating system.
Wherein, during work, the drive singal that described sinusoidal signal generator exports is divided into two-way, and a road is directly carried in described LiNbO
3the underarm control end of modulator, another road reloads described LiNbO after back-modulation
3the upper arm control end of modulator, described LiNbO
3modulator is modulated the continuous laser signal that laser exports, and produce carrier wave and to draw up subcarrier signal, this signal comprises two subcarrier components, and carrier component is drawn up, after this, subcarrier signal enters filtering modulator, this modulator has the function of filtering and modulation, first the subcarrier signal entering modulator divides the two paths up and down of two-way respectively by being made up of FBG, complete the effect that carrier wave is separated, intensity modulated is carried out by under the effect of external signal subsequently in the intensity modulator of upper and lower two-arm, light signal is made to be called strength mis-matching, the light signal that frequency is different, after the coupling of filtering modulator output, be fsk signal, the signal driving filtering modulator is data-signal, data-signal is produced by data signal generator, one tunnel is directly loaded into filtering modulator and modulates light wave, one tunnel second inverter is loaded into filtering modulator and modulates light wave, therefore the light carrier through the two-arm up and down of two paths of data modulation is amplitude coupling, the flashlight that frequency is different.
Wherein, described LiNbO
3modulator is modulated the continuous laser that laser exports, and its transfer function is:
Wherein, L is insertion loss, and r is LiNbO
3the splitting ratio of the upper and lower two-arm of modulator (4),
be respectively the phase place of upper and lower arm, V
1(t), V
2t () is respectively the driving voltage of upper and lower two-arm, V
π RF, V
π DCfor LiNbO
3the half-wave voltage of modulator, V
b1, V
b2be respectively the bias voltage of upper and lower two-arm.
Wherein, described filtering modulator comprises the first coupler, the first Bragg grating optical fiber, the first intensity modulator, the second Bragg grating optical fiber, the second intensity modulator and the second coupler; The input of described first coupler is connected to described LiNbO
3the output of modulator, one end of described first Bragg grating optical fiber is connected with the first output of described first coupler, and one end of described second Bragg grating optical fiber is connected with the second output of described first coupler; The input of described first intensity modulator is connected to the other end of described first Bragg grating optical fiber, and the control end of described first intensity modulator is connected with the output of described second inverter as the upper arm control end of described filtering modulator; The input of described second intensity modulator is connected to the other end of described second Bragg grating optical fiber, and the control end of described second intensity modulator is connected with the output of described data generator as the underarm control end of described filtering modulator; The first input end of described second coupler is connected to the output of described first intensity modulator, second input of described second coupler is connected to the output of described second intensity modulator, and the output of described second coupler is as the output of described filtering modulator.
Wherein, the center filter wavelength of described first Bragg grating optical fiber and LiNbO
3subcarrier Wavelength matched that modulator exports, bandwidth is equal.
Compared with prior art, the present invention adopts a laser, utilizes LiNbO
3the modulating action of modulator produces the frequency of two subcarrier components as carrying signal, reduces the difference in size of the amplitude of different frequency component, improves the stability of signal, and the dispersion improving Signal transmissions, on the impact of fsk signal, reduces the error rate.Simultaneously, the present invention proposes a kind of new type of modulation device---i.e. filtering modulator, input waveguide is FBG optical fiber, the effect of partial wave, filtering can be completed, the constant amplitude of better guarantee frequency component, reduce external factors to modulating frequency and amplitude impact, the stability of further guarantee signal and dispersion are on the impact of signal.In addition, the present invention also utilizes filtering strength modulator to carry out the loading of signal message and the generation of fsk signal, and modulation system is simple, features simple structure.
Accompanying drawing explanation
The theory diagram of the FSK modulating system that Fig. 1 provides for the embodiment of the present invention;
The structural representation of the laser that Fig. 2 provides for the embodiment of the present invention and LiNbO3 modulator operational module;
The structural representation of the filtering strength modulator operational module that Fig. 3 provides for the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of FSK modulated structure.This kind of structure can produce fsk signal at a high speed, and structure is simple.
In embodiments of the present invention, the continuous light of laser is come from through LiNbO
3the modulating action of modulator produces carrier wave and to draw up signal, this signal comprises two subcarriers, subcarrier signal enters filtering modulator, FBG optical fiber is adopted at the input interface of this device, not only can play the effect of filtering, also can to guarantee input light wave on entering, amplitude when lower two-arm is modulated is equal, input light wave is under FBG filter action, on, lower two-arm produces unifrequency subcarrier frequency signals, amplitude is equal, enter respectively, the intensity modulator of lower two-arm, intensity modulator is modulated two frequency components respectively under the signal function of outside drive singal, produce the flashlight of complementary intensity, it is exactly fsk signal after coupling.
As shown in Figure 1, FSK modulating system comprises the structure of the FSK modulating system that the embodiment of the present invention provides: sinusoidal signal generator 1, laser 2, first inverter 3, LiNbO
3modulator 4, data signal generator 5, second inverter 6 and filtering modulator 7; The output of laser 2 and LiNbO
3the input of modulator 4 is connected; The output of sinusoidal signal generator 1 is after shunt, and a road is connected with the input of the first inverter 3, another road and LiNbO
3the underarm control port of modulator 4 connects; The output of the first inverter 3 and LiNbO
3the underarm control port of modulator 4 connects; The output of data signal generator 5 divides two paths of data signal, and a road is connected with the input of the second inverter 6, and another road is connected with the underarm control port of filtering modulator 7; The output of the second inverter 6 is connected with the upper arm control port of filtering modulator 7, the input of filtering modulator 7 and LiNbO
3the output of modulator 4 connects, and the output of filtering modulator 7 is as the output of FSK modulating system.
Wherein, LiNbO
3modulator 4 has 4 interfaces, be respectively 1 input interface, 2 control interfaces, 1 output interface, input interface exports with laser 2 and is connected, output interface is connected with the input interface of filtering modulator 7, and upper arm control interface is connected with the output interface of the first inverter 3, and underarm control interface is connected with sinusoidal signal generator 1.
Filtering modulator 7 has 4 interfaces, is respectively 1 input interface, 1 output interface, 2 control interfaces, input interface and LiNbO
3the output interface of modulator 4 connects, and upper arm control interface is connected with the output interface of the second inverter 6, and underarm control interface is connected with data signal generator 5 output port, and output port is the output of total system.
In embodiments of the present invention, sinusoidal signal generator 1 produces sine wave signal, frequency-adjustable, and this sine wave signal can be modulated light wave, makes frequency of light wave produce subcarrier, for the carrier frequency of FSK modulation; Laser 2 can be continuous light laser, produces system arrowband light wave used, as the carrier signal of modulation and carry data signals; First inverter 3 is to allow the positive negative level of sinusoidal signal reverse, producing conjugated signal, for modulating LiNbO
3modulator 4, makes LiNbO
3modulator 4 is operated in the state of recommending, from LiNbO
3the light wave exported in modulator 4 is CSRZ light wave, only containing subcarrier component; LiNbO
3modulator 4 is the main devices producing CSRZ signal, this device completes input light wave modulation under the modulation of external control signal, produce carrier wave to draw up subcarrier, for future use, because two of fsk signal frequency signal device generations completely thus, export the system of two frequencies as FSK carrier frequency compared to two lasers, this system can the stability of strict guarantee two-way FSK frequency signal and two-way laser frequency, phase place, amplitude matching; Data signal generator 5 is the signal generator of signal transmission, as modulation signal; Second inverter 6 is as the inverter of data signal generator 5, utilize this inverter the level of data-signal can be reversed, be about to ' 0 ', ' 1 ' signal reversion, therefore the signal of two paths of signals after the second inverter 6 is loaded into filtering modulator 7 of data signal generator 5 is ' 0 ', ' 1 ' coupled signal; Filtering modulator 7 is the main devices of this system, this device can complete the generation of fsk signal, this device directly can complete the effect of filtering and modulation, because the full symmetric of upper and lower two-arm, the amplitude difference of two-way frequency signal can be made, ensure the amplitude stabilization of fsk signal, reduce the factor impacts such as the dispersion of fsk signal transmission.
In embodiments of the present invention, as shown in Figure 3, filtering modulator 7 comprises the first coupler 71, first Bragg grating optical fiber 72, first intensity modulator 73, second Bragg grating optical fiber 74, second intensity modulator 75 and the second coupler 76 to the internal structure of filtering modulator 7; First coupler 71 has an input two outputs, and an input port is external input port, and two output ports connect the input port of the first Bragg grating optical fiber 72 and the second Bragg grating optical fiber 74 respectively; First Bragg grating optical fiber 72 output interface is connected with the input interface of the first intensity modulator 73; The output interface of the second Bragg grating optical fiber 74 is connected with the input interface of the second intensity modulator 75; First intensity modulator 73 is connected with the input interface of the second coupler 76 with the output interface of the second intensity modulator 75; The output interface of the second coupler 76 is the output interface of filtering modulator 7.First coupler 71 act as partial wave, light wave 1:1 entered two Bragg grating optical fibers; Bragg grating optical fiber completes the filter effect of the subcarrier to input, the center filter wavelength of Bragg grating optical fiber and the Wavelength matched of subcarrier, bandwidth is equal, the light carrier of output can be made except different in centre frequency, other optical information is identical, therefore can ensure matching, the identity property of two frequency components of FSK, namely ensure the good of the stable of fsk signal and transmission performance; First intensity modulator 73 and the second intensity modulator 75 are modulation of settling signal, are loaded into by data-signal on light wave; Second coupler 76 has been light waves being coupled as a permanent power of two-way light carrier, and this light wave ensures constant completely in amplitude, and then improves the transmission performance of fsk signal, improves the ability of dispersion of drawing up.
Filtering modulator 7 is compared to other intensity modulators, this modulator have employed Bragg grating optical fiber on input waveguide, due to the good welding performance of grating fibers, can as the input waveguide of input intensity modulator, not only complete the effect of light path, and complete the effect of filtering, a key factor because of FSK modulation is exactly the constancy of two the carrying Frequency and Amplitude ensureing fsk signal, therefore compared to the device of filtered external, in this filtering modulator, transmission waveguide adopts Bragg grating optical fiber, so can ensure that the constant of the light path in light wave transmissions is with stable, ensure that the device in two paths of signals ensures consistent, therefore fine ensure that the impact of external factors on signal light-wave, and up and down in two-way light signal to becoming second nature, and make the consistent of the amplitude of two optical carrier frequency, the amplitude of the fsk signal therefore produced is more stable, reduce the impact of dispersion in optical fiber in optical signal transmission process, improve the transmission quality of signal.
Come from the continuous light of laser 2 through LiNbO
3the modulating action of modulator 4 produces carrier wave and to draw up signal, and this signal comprises two subcarrier signals, and carrier component is subject to very large effect of drawing up; This signal is sent into filtering modulator 7, the input port of this intensity modulator adopts Bragg grating optical fiber as input optical fibre, therefore light signal is by 1:1 partial wave, Bragg grating optical fiber filtering, produce the light signal of two independent frequency components, the information matches such as the amplitude of these two signals is equal, phase place; Filtering modulator about 7 two-arm is two intensity modulators, this pattern can strict guarantee signal synchronous, filtering modulator 7 is modulated two frequency components respectively under the effect of outside drive singal, factor data signal is complementary signal, therefore light wave produces the flashlight of complementary intensity under the modulation of data-signal, be exactly fsk signal after coupling, in this signal, the amplitude of FSK component can ensure to stablize, unanimously, therefore can improve transmission quality in signals transmission.
In order to the FSK modulating system that the further description embodiment of the present invention provides, carry out the operation principle that piecemeal illustrates every part below:
(1) laser and LiNbO
3modulator
Laser 2 as shown in Figure 2 and LiNbO
3the fundamental diagram of modulator 4.Laser 2 is continuous light wave laser, and the continuous laser of generation can ensure the stability of luminous power.LiNbO
3modulator 4 is directly connected with laser 1, and continuous light wave enters LiNbO
3modulator is modulated, and produces carrier wave and to draw up light carrier.
LiNbO
3the modulation principle of modulator 4 is as follows:
Modulator is modulated continuous laser under bias voltage and driving voltage, and its transfer function is:
Wherein, L is insertion loss, and r is the splitting ratio of upper and lower two-arm,
for the phase place of upper and lower arm, V
1(t), V
2t () is the driving voltage of upper and lower two-arm, V
π RF, V
π DCfor radio frequency, direct current half-wave voltage, V
b1, V
b2for the bias voltage of upper and lower two-arm.In this example, make r=1/2, V
b1=V
b2=V
π.Therefore, transfer function becomes:
h(t)＝10
-L/20[1/2{exp[jπ(V
1(t)+V
B1)/V
π]}
+{1/2{exp[jπ(V
2(t)+V
B2)/V
π]
Make V
b1-V
b2=V
π, V
1(t)+V
2(t)=2V
π, then can obtain carrier wave and to draw up signal, be i.e. the carrier wave subcarrier signal of drawing up.
In the present invention, offset signal DC voltage control, drive singal sinusoidal signal generator produces; Sinusoidal signal generator produces the f that frequency is
msinusoidal signal is divided into two-way, and a road is directly loaded into modulator; Back-modulation is carried out on another road, namely forms cosine signal and reloads on modulator; Two kinds of signal loading are to LiNbO
3modulator, modulates lightwave signal.The lightwave signal produced is drawn up to carrier wave, on frequency spectrum, therefore only have two subcarrier frequency (f
0-f
m, f
0+ f
m), two frequency ranges now produced, the factor such as amplitude, stability ensure consistent, are convenient to the stability of later stage fsk signal, and this FSK modulates and adopts a laser to pass through LiNbO completely
3modulators modulate produces the light carrier of two carry informations, therefore these two carrier waves are except light frequency difference, other optical information is identical, therefore will reduce the impact of other factors (as the optical information such as phase place, polarization) for fsk signal transmission quality.
(2) filtering modulator
The fundamental diagram of filtering modulator 7 as shown in Figure 3.This device is formed just like lower part: the first coupler 71, first Bragg grating optical fiber 72, first intensity modulator 73, second Bragg grating optical fiber 74, second intensity modulator 75, second coupler 76.Two intensity modulators lay respectively at the upper and lower two-arm place of modulator and Striking symmetry, and ensure the coupling of signal, input port adopts Bragg grating optical fiber, completes the effect of 1:1 partial wave and filtering.Come from LiNbO
3the carrier wave of modulator 4 signal of drawing up enters filtering strength modulator, and light wave is separated into the light wave that oscillator intensity is 1:1 by input port, completes the separation of frequency component in two sections of Bragg grating optical fibers.These two sections of Bragg grating optical fibers two subcarrier frequencies are divided into two completely equivalent, the light carrier that frequency is different, i.e. f
0-f
msubcarrier and f
0+ f
msubcarrier, so that use in the later stage.
The operation principle of Bragg grating is: λ
b=2n
effΛ; Wherein, λ
bfor reflection wavelength, n
efffor the effective refractive index of fiber core, Λ is the cycle of Bragg grating.Regulate the effective refractive index of fiber core and the cycle of Bragg grating, make the reflection wavelength of Bragg grating equal the wavelength (f of optical sub-carrier
0-f
m, f
0+ f
m).
Because bragg grating can be formed at an optical fiber upper set completely by optical fiber completely, therefore there is the good weldability with optical fiber; And manufacture craft is ripe, with low cost; Therefore Bragg grating optical fiber can be integrated in as input optical fibre in intensity modulator well, and adds live level on its substrate, can control the fiber core refractive index of Bragg grating, and then regulates its operation wavelength.
This modulator is formed by two intensity modulators are parallel, intensity modulator is subject to the modulation of external data signal, external data signal is divided into two-way, one tunnel is directly loaded into a road intensity modulator, one tunnel was entered inverter and was loaded into another road intensity modulator, the amplitude exported because of the light intensity of intensity modulator is subject to the modulation of external data information, owing to there being the effect of inverter, two ways of optical signals then can produce frequency difference, the light signal of complementary intensity, at coupler place, because the frequency of two ways of optical signals is not identical, therefore interference effect can not be produced, only play light signal and merge into a road.
The operation principle of intensity modulator is:
Suppose that light signal is: the subcarrier signal that frequency of setting out on a journey is higher is: e
upper(t)=A
mcos (ω
uppert+ φ
upper); The subcarrier signal that lower road frequency is lower is: e
down(t)=A
mcos (ω
downt+ φ
down).
Data-signal is rectangular pulse signal, is assumed to be h (t), and its value is 1 or 0; Data-signal of then setting out on a journey is h ' (t), and its value is then 0 or 1.
Light signal then after modulation is:
e
upper(t)＝A
mh(t)cos(ω
uppert+φ
upper)
e
down(t)＝A
mh′(t)cos(ω
downt+φ
down)
Because the frequency of two ways of optical signals is different, when after coupling, light wave does not produce interference effect, is:
e
c(t)＝A
m{h(t)cos(ω
uppert+φ
upper)+h′(t)cos(ω
downt+φ
down)}
Light signal produces with the modulation of data-signal the lightwave signal be interrupted, due to complementation during two paths of data signal, so the signal entrained by two-way subcarrier frequency is also complementary, when two-way subcarrier signal closes ripple, frequency will be produced constantly change, but the fsk signal that intensity is identical.
The fiber waveguide in two paths of data input channel is changed into bragg grating in filtering modulator, therefore the impact of various external factors during filtered external can not only be reduced, and to two-way light wave amplitude influences during filtered external, now will reduce the impact of fsk signal dispersion in transmitting procedure that FSK causes because of the amplitude difference of two frequency components greatly, and due to the Striking symmetry of the upper and lower two-way of this device, also ensure that the stable of signal and coupling, improve the quality of fsk signal, improve the transmission performance of fsk signal.
Below in conjunction with accompanying drawing and instantiation, the present invention is further described.Herein the payload signal taking data rate as 40G/s is described in detail to the present invention.
The operation wavelength of laser is 1552.5nm (i.e. 193.1THz), and bandwidth is 10MHz, and first continuous laser enters LiNbO
3modulator is modulated, and produces carrier wave and to draw up signal, and namely carrier wave is drawn up light wave, now will export the light wave only containing two subcarrier signals.LiNbO
3modulator be Dual Drive modulator, drive singal is the sine wave signal of 40G/s, the sine wave signal produced by signal generator, and a road is directly loaded into LiNbO
3a drive end of modulator, another road is loaded into LiNbO through reverser
3the other end of modulator; LiNbO
3the half-wave voltage of modulator is 4V, then modulate LiNbO
3the bias voltage of modulator may be controlled to upper arm and is biased to 0, and underarm bias voltage is 4V, driving voltage: upper underarm is respectively 4V and-4V; Then now LiNbO
3it is that the carrier wave of 193.14THz and 193.06THz is drawn up light signal that modulator exports two subcarrier frequencies.
By LiNbO
3the subcarrier light wave that modulator produces enters filtering modulator, and filtering modulator can complete the function of partial wave, filtering, intensity modulated.First subcarrier light wave carries out partial wave and produces amplitude ratio 1:1 two light waves, two paths of signals enters Bragg grating optical fiber, this Bragg grating optical fiber is fused to intensity modulator input port respectively, and the center filter wavelength of two Bragg grating optical fibers is respectively the wavelength of two subcarriers.Come from LiNbO
3the output light-wave of modulator, enter the FBG that center frequency filtering is 193.06THz and 193.14THz respectively, now be respectively 193.06THz and 193.14THz by the light wave frequency of two after Bragg grating optical fiber, then the light wave of these two independent frequency components directly entered follow-up intensity modulator.
The two bundle subcarrier optical signals coming from Bragg grating optical fiber enter two intensity modulators respectively, and intensity modulator by the modulation of drive singal, then under the effect of additional driving, makes the fluctuation of the amplitude external signal of light signal and changes.Drive singal is the data-signal of 40G/s, and this signal represents the payload in communication network.PRBS is adopted to produce the random signal of 40G/s in this example, then two-way is divided into, one tunnel enters the intensity modulator of setting out on a journey, one tunnel enters another road intensity modulator through inverter, this two paths of signals wants strict guarantee to enter the clock synchronous of two intensity modulators, guarantee two ways of optical signals is subject to the luminous intensity complementation that this two paths of data signal madulation produces, and ensures alternately occurring of two frequencies when producing FSK.
From the modulated light signal that two intensity modulators produce, modulated the data-signal of complementary intensity respectively in two light frequencies, therefore, when road light frequency data are " 1 ", another information entrained by light frequency of road is " 0 "; When one tunnel light frequency data are " 0 ", another road light frequency data are then " 1 ".When two-way information is coupled at coupler, then two frequencies can be made along with the form alternately appearance of data-signal, i.e. said fsk signal.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. based on a FSK modulating system for filtering modulator, it is characterized in that, comprise sinusoidal signal generator (1), laser (2), the first inverter (3), LiNbO
3modulator (4), data signal generator (5), the second inverter (6) and filtering modulator (7);
The input of described first inverter (3) is connected to the output of described sinusoidal signal generator (1), and the output of described first inverter (3) is connected to described LiNbO
3the upper arm control port of modulator (4);
Described LiNbO
3the input of modulator (4) is connected to the output of described laser (2), described LiNbO
3the underarm control port of modulator (4) is connected to the output of described sinusoidal signal generator (1);
The input of described second inverter (6) is connected to the output of described data signal generator (5), and the output of described second inverter (6) is connected to the upper arm control end of described filtering modulator (7),
The input of described filtering modulator (7) is connected to described LiNbO
3the output of modulator (4), the underarm control port of described filtering modulator (7) is connected to the output of described data signal generator (5), and the output of described filtering modulator (7) is as the output of FSK modulating system.
2. FSK modulating system as claimed in claim 1, is characterized in that, during work, laser produces continuous wave laser and enters LiNbO
3modulator (4), LiNbO
3modulator (4) is modulated laser signal under the control of sinusoidal signal, produce carrier wave to draw up subcarrier signal, subcarrier signal enters filtering modulator (7), in filtering modulator, subcarrier signal divides two-way to complete the effect of carrier wave separation by the upper and lower passage be made up of FBG, and intensity modulated is carried out by under the effect of data-signal in the intensity modulator in upper and lower two-arm, make the different light signal of strength mis-matching, frequency export fsk signal after the coupling of filtering modulator (7) output; Described sinusoidal signal is produced by sinusoidal signal generator (1), and sinusoidal signal is divided into two-way, and a road is directly carried in described LiNbO
3the underarm control end of modulator (4), another road reloads described LiNbO after back-modulation
3the upper arm control end of modulator (4); Data-signal is produced by data signal generator (5), data-signal is divided into two-way, one tunnel is directly loaded on filtering modulator (7) and modulates light wave, and another road reloads on filtering modulator (7) and adjusts light wave after the second inverter (6) is reverse.
3. FSK modulating system as claimed in claim 1, is characterized in that, described LiNbO
3modulator (4) is modulated the continuous laser that described laser (2) exports, and its transfer function is:
Wherein, L is insertion loss, and r is LiNbO
3the splitting ratio of the upper and lower two-arm of modulator (4),
be respectively the phase place of upper and lower arm, V
1(t), V
2t () is respectively the driving voltage of upper and lower two-arm, V
π RF, V
π DCfor LiNbO
3the half-wave voltage of modulator, V
b1, V
b2be respectively the bias voltage of upper and lower two-arm.
4. FSK modulating system as claimed in claim 1, it is characterized in that, described filtering modulator (7) comprises the first coupler (71), the first Bragg grating optical fiber (72), the first intensity modulator (73), the second Bragg grating optical fiber (74), the second intensity modulator (75) and the second coupler (76);
The input of described first coupler (71) is connected to described LiNbO
3the output of modulator (4), one end of described first Bragg grating optical fiber (72) is connected with the first output of described first coupler (71), and one end of described second Bragg grating optical fiber (74) is connected with the second output of described first coupler (71);
The input of described first intensity modulator (73) is connected to the other end of described first Bragg grating optical fiber (72), and the control end of described first intensity modulator (73) is connected with the output of described second inverter (6) as the upper arm control end of described filtering modulator (7);
The input of described second intensity modulator (75) is connected to the other end of described second Bragg grating optical fiber (74), and the control end of described second intensity modulator (75) is connected with the output of described data generator (5) as the underarm control end of described filtering modulator (7);
The first input end of described second coupler (76) is connected to the output of described first intensity modulator (73), second input of described second coupler (76) is connected to the output of described second intensity modulator (75), and the output of described second coupler (76) is as the output of described filtering modulator (7).
5. FSK modulating system as claimed in claim 4, is characterized in that, the center filter wavelength of described first Bragg grating optical fiber (72) and LiNbO
3the subcarrier that modulator (4) exports Wavelength matched, bandwidth is equal.
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| CN116865866A (en) * | 2023-09-04 | 2023-10-10 | 湖北经济学院 | Carrier-suppressed zero-return alternating polarization/frequency shift keying quadrature modulation optical communication system |
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