CN114978330B - Feedforward post-compensation linearization radio frequency optical transmitter and improvement method thereof - Google Patents
Feedforward post-compensation linearization radio frequency optical transmitter and improvement method thereof Download PDFInfo
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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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
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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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5059—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input
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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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5059—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input
- H04B10/50593—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input to control the modulating signal amplitude including amplitude distortion
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- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5059—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input
- H04B10/50597—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input to control the phase of the modulating signal
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Abstract
The invention discloses a feedforward post-compensation linearization radio frequency optical transmitter and an improvement method thereof, comprising a beam splitter, a modulator, a detector and an amplifying circuit, wherein a compound modulator is utilized to complete the feedforward optical path post-compensation function, the feedforward is that light emitted by a laser is divided into two parts, one part enters a modulator chip, the other part enters an optical detector and the amplifying circuit to carry out reverse phase treatment and then enters the modulator, and second-order distortion signals in the two paths of signals have the same delay, the same amplitude and opposite phases so as to realize mutual offset, thereby realizing the second-order nonlinear post-compensation of the light in the laser, effectively improving the linearity of the optical transmitter and the SFDR spurious-free dynamic range of the optical transmitter.
Description
Technical Field
The invention relates to the technical field of photoelectric communication, in particular to a feedforward post-compensation linearization radio frequency optical transmitter and an improvement method thereof.
Background
With the rapid development of the demand of high-capacity information technology, the drawbacks of microwave communication are more remarkable, mainly because the microwave transmission medium has great loss when transmitting high-frequency microwaves for a long distance, thereby leading to limited high-frequency expansion of the use frequency. The radio frequency optical fiber transmission has the advantages of high bandwidth, high sensitivity, strong anti-interference performance, long transmission distance and high confidentiality, and can be widely applied to the fields of backbone network communication, television broadcast signal transmission and the like.
The radio frequency signal optical fiber transmission comprises three parts, namely an electric/optical conversion device (optical transmitter), a transmission medium (optical fiber) and an optical/electric conversion device (optical receiver). At the transmitting end, the radio frequency optical transmitter modulates the radio frequency signal onto an optical carrier wave and outputs an optical wave through an optical fiber; at the receiving end, the optical signal carrying the radio frequency signal enters the detector, the radio frequency signal is demodulated, and the optical signal is finally output through a series of signal processing, so that the electric/optical-optical/electric conversion is realized.
Radio frequency optical fiber transmission has also attracted considerable attention in antenna array networking systems due to its significant advantages. The radio frequency signal optical fiber transmission technology is realized by an analog modulation mode, is an analog communication technology, has strict requirements on parameters such as linearity, dynamic range and the like of a transmitter, otherwise, serious distortion of microwave radio frequency signals is caused, so that a nonlinear line of a laser at an optical transmitting end greatly influences radio frequency signals demodulated by a receiving end, and therefore, the strict requirements of a radio frequency optical fiber transmission system applied to the fields such as an antenna array system and the like on indexes such as harmonic waves and spurious suppression of the radio frequency signals become key factors for restricting the application of radio frequency optical fiber transmission.
In the prior art, US5132639a discloses a predistorter for linearizing electronic and optical signals, and the predistorter adopts a predistortion circuit to improve indexes, but compensates second-order distortion of an optical path through a diode device circuit, and the corresponding indexes cannot be completely matched, so that the problems of complex structure, difficult adjustment, non-ideal compensation effect and the like exist. Along with the continuous improvement of application requirements, the index requirement on second-order distortion compensation is higher, and the existing predistortion circuit compensation scheme cannot meet the requirements of the professional application field. In order to solve this problem, a linearization circuit that is simple and reliable, convenient to adjust, and good in compensation effect is required.
Disclosure of Invention
Aiming at the technical problems, the invention provides a feedforward post-compensation linearization radio frequency optical transmitter and an improvement method thereof, which meet the practical requirements of high linearity and high dynamic range.
In order to achieve the above object, the present invention provides the following technical solutions:
a feedforward post-compensation linearization radio frequency optical transmitter comprises a laser unit, a composite modulator unit, a predistortion compensation unit, an SBS suppression unit, a bias control unit and a beam splitter; the laser unit comprises a temperature controller and a laser; the composite modulator unit comprises a beam splitter, a light detector, an amplifying and equalizing circuit and a modulator chip, wherein the composite modulator unit and the laser form a back compensation light path, the nonlinearity of a cosine modulation curve of the modulator is utilized to compensate the second-order nonlinearity of the laser, an optical carrier signal from the laser is divided into two parts by the beam splitter, one part enters the modulator chip, the other part enters the amplifying and equalizing circuit by the light detector, the other part enters the modulator after being subjected to phase inversion treatment, the two parts of light entering the modulator chip have the same amplitude and opposite phases, and the amplitude end of the modulator chip is connected with the bias control unit and is used for adjusting the second-order MAX point of the modulator; the drive amplifying circuit unit consists of a pre-amplifying circuit, a second-order predistortion compensating circuit, a third-order predistortion compensating circuit and a drive amplifying circuit, wherein a part of optical carrier signals entering the amplifying and equalizing circuit are processed in an inverting way and then enter the drive amplifying circuit.
Wherein, the temperature controller includes temperature detector, controller and refrigerator. The modulator chip is integrated with a phase modulator and is connected with the SBS suppression unit for SBS suppression of the optical link.
The invention also provides a method for improving the feedforward post-compensation linearization radio frequency light, which adopts the feedforward post-compensation linearization radio frequency light transmitter and comprises the following steps:
radio frequency input signal U 301 The signal is input from the port and is led to generate a second-order intermodulation signal U through a predistortion compensation unit and a laser unit 101 Signal U entering the complex modulator unit 101 After beam splitting by the beam splitter, the first branch signal U 201 Modulated by a complex modulator, and the modulated signal generates a second-order phase signal U 24 The other part of signals enter an amplifying and equalizing circuit through a light detector to output a second branch signal U 202 After being processed by phase inversion, the two parts of light entering the modulator have the same amplitude and opposite phases, and the modulator obtains an output signal U 203 。
Wherein the radio frequency input signal U 301 Expressed as:
U 301 ＝Acosω 1 t+Bcosω 2 t
second order intermodulation signal U 101 Expressed as:
U 101 ＝a(Acosω 1 t+Bcosω 2 t)+b(A 2 cos 2 ω 1 t+B 2 cos 2 ω 2 t+2ABcosω 1 tcosω 2 t)
the first branch signal is expressed as:
U 201 ＝C[a(Acosω 1 t+Bcosω 2 t)+b(A 2 cos 2 ω 1 t+B 2 cos 2 ω 2 t+2ABcosω 1 tcosω 2 t)]
second-order phase signal U 24 Expressed as:
U 24 ＝cC[a(Acosω 1 t+Bcosω 2 t)+b(A 2 cos 2 ω 1 t+B2cos 2 ω 2 t+2ABcosω 1 tcosω 2 t)]-D(A 2 cos 2 ω 1 t+B 2 cos 2 ω 2 t+2ABcosω 1 tcosω 2 t)
second branch signal U 202 Expressed as: u (U) 202 ＝(1-C)[a(Acosω 1 t+Bcosω 2 t)+b(A 2 cos 2 ω 1 t+B 2 cos 2 ω 2 t+2ABcosω 1 tcosω 2 t)]
Output signal U 203 Expressed as:
U 203 ＝U 24 +U 202 。
compared with the prior art, the invention has the beneficial effects that:
the invention relates to a feedforward post-compensation linearization radio frequency optical transmitter, which comprises a beam splitter, a modulator, a detector and an amplifying circuit, wherein a compound modulator is utilized to complete the feedforward optical path post-compensation function, the feedforward is that light emitted by a laser is divided into two parts, one part enters a modulator chip, the other part enters an optical detector and an amplifying circuit to carry out reverse phase processing, and then enters the modulator, second-order distortion signals in the two signals have the same time delay, the same amplitude and opposite phases so as to realize mutual cancellation, thereby realizing the second-order nonlinear post-compensation of the light in the laser, effectively improving the linearity of the optical transmitter and improving the SFDR spurious-free dynamic range of the optical transmitter.
The feedforward post-compensation linearization radio frequency light improvement method of the invention compensates the second-order distortion and the third-order distortion first, and adopts the composite modulator to complete the feedforward post-compensation function of the laser, and the second-order distortion compensation effect is obvious. Compared with the method for compensating the nonlinearity of the laser by only adopting the predistortion circuit, the scheme for compensating the laser by using the optical modulator has the advantages of better index matching degree, obvious linearization effect and wider application value.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
Fig. 1 is a schematic diagram of a mechanism of a feedforward post-compensation linearization rf optical transmitter according to an embodiment of the invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention provides a large dynamic low distortion and high linearity feedforward post-compensation linearization radio frequency optical transmitter, which comprises a laser unit 1, a composite modulator unit 2, a predistortion compensation unit 3, an SBS (stimulated Brillouin scattering) suppression unit 4, a bias control unit 5 and a beam splitter 6.
The laser unit 1 comprises a temperature controller 11 and a laser 12, wherein the temperature controller 11 comprises a temperature detector, a controller and a refrigerator, so that the laser luminous power is stable under the full-temperature environment and long-time use.
The complex modulator unit 2 comprises a beam splitter 21, a light detector 22, an amplifying equalization circuit 23, a modulator chip 24. The nonlinear optical characteristic of the modulator itself can be used to form a post-compensation optical path with the laser 12, and the nonlinearity of the cosine modulation curve of the modulator is used to compensate the second-order nonlinearity of the laser 12. A phase modulator is integrated on the modulator 24, connected to the SBS suppression unit 4, for SBS suppression of the optical link.
The optical carrier signal from the laser 12 is divided into two parts by the beam splitter 21, one part enters the modulator chip 24, the other part enters the amplifying and equalizing circuit 23 by the optical detector 22, and enters the modulator 24 after being processed in an inverted mode, and the two parts of light entering the modulator chip 24 have the same amplitude and opposite phases, so that the second order can be completely counteracted under the condition that the two parts enter the modulator chip 24 at the same time, and even the delay error is met, the second order index can be reduced by more than 15-20 dB. The amplitude terminal of the modulator chip 24 is connected to the bias control unit 5 for adjusting the second order MAX point (maximum value) of the modulator 24. In conclusion, the feedforward and post-compensation function of the transmitter system is completed, the influence of second-order indexes is effectively reduced, and the linearity and the dynamic range of the transmitter system are improved.
The driving amplification circuit unit 3 is composed of a pre-amplification circuit 31, second and third order predistortion compensation circuits 32, and a driving amplification circuit 33. The optical carrier signal having entered the amplification and equalization circuit 23 is partially entered into the drive amplification circuit 33 after being subjected to the inversion processing.
Nonlinear distortion of the laser is mainly second-order intermodulation products, which is also a problem mainly solved by the scheme.
Second order term: k (K) 2 (Acosω 1 t+Bcosω 2 t) 2 This was developed as:
＝K 2 [A 2 /2+B 2 /2+A 2 /2cos 2 ω 1 t+B 2 /2cos 2 ω 2 t+ABcos(ω 1 ±ω 2 )t]
in which A 2 /2、B 2 And/2 is a direct current term (low-frequency term) which can be filtered through a capacitor, the third term and the fourth term are second harmonic terms (called second harmonic products), and the fifth term and the sixth term are beat terms (called beat products). In summary, the latter four terms are newly generated frequency terms that form intermodulation interference as long as they fall within the normal signal frequency range. These frequency components are called second order intermodulation products, and the sum of the products is commonly referred to as combined second order distortion, abbreviated IMD2.
On the other hand, the invention also provides a method for improving the feedforward post-compensation linearization radio frequency light by adopting the radio frequency optical transmitter, in the scheme, the radio frequency input signal U 301 By U-shaped 301 ＝Acosω 1 t+Bcosω 2 t is input from the port 301, and the signal is subjected to the predistortion compensation unit 3 and the laser unit 1 to generate a second-order intermodulation signal U 101 The signal 101 entering the complex modulator unit 2 can be expressed as:
U 101 ＝a(Acosω 1 t+Bcosω 2 t)+b(A 2 cos 2 ω 1 t+B 2 cos 2 ω 2 t+2ABcosω 1 tcosω 2 t)；
after splitting by the splitter 21, the signal at the first branch signal 201 can be expressed as:
U 201 ＝C[a(Acosω 1 t+Bcosω 2 t)+b(A 2 cos 2 ω 1 t+B 2 cos 2 ω 2 t+2ABcosω 1 tcosω 2 t)]；
the first branch signal U201 is modulated by the complex modulator 24, and the modulated signal generates a second-order phase signal with opposite phases:
U 24 ＝cC[a(Acosω 1 t+Bcosω 2 t)+b(A 2 cos 2 ω 1 t+B2cos 2 ω 2 t+2ABcosω 1 tcosω 2 t)]-D(A 2 cos 2 ω 1 t+B 2 cos 2 ω 2 t+2ABcosω 1 tcosω 2 t)；
the other part of the signals enter an amplifying and equalizing circuit 23 through a light detector 22 to output a second branch signal U 202 ，U 202 The signal is expressed as: u (U) 202 ＝(1-C)[a(Acosω 1 t+Bcosω 2 t)+b(A 2 cos 2 ω 1 t+B 2 cos 2 ω 2 t+2ABcosω 1 tcosω 2 t)]；
Let the signal at 202 have a sum U 24 The signals have the same amplitude but 180 degrees out of phase.
The output signal at 203 may be represented as:
U 203 ＝U 24 +U 202 。
since the value of C is generally small, U 24 Middle cCb (A) 2 cos 2 ω 1 t+B 2 cos 2 ω 2 t+2ABcosω 1 tcosω 2 t) this second order term has little effect on the signal and can be ignored. I.e. when d=b (1-C), the signal U is output 203 The second order term of (c) can be eliminated to achieve the purpose of modulator post-compensation.
When the invention is actually tested, the DFB laser is used, the IMD2 index of the DFB laser is-43.3 dBm, and after the DFB laser is compensated by the compensation circuit of the modulator, the IMD2 index of the system reaches-62.6 dBm, so that the excellent correction effect is achieved.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The feedforward post-compensation linearization radio frequency optical transmitter is characterized by comprising a laser unit (1), a composite modulator unit (2), a predistortion compensation unit (3), an SBS suppression unit (4), a bias control unit (5) and a beam splitter (6); the laser unit (1) comprises a temperature controller (11) and a laser (12); the composite modulator unit (2) comprises a beam splitter (21), a light detector (22), an amplifying and equalizing circuit (23) and a modulator chip (24), wherein the composite modulator unit (2) and the laser (12) form a back compensation light path, the nonlinearity of a cosine modulation curve of the modulator is utilized to compensate the second-order nonlinearity of the laser (12), an optical carrier signal from the laser (12) is divided into two parts through the beam splitter (21), one part enters the modulator chip (24), the other part enters the amplifying and equalizing circuit (23) through the light detector (22), the optical carrier signal enters the modulator chip (24) after being subjected to phase inversion treatment, the two parts of light entering the modulator chip (24) have the same amplitude and opposite phases, and the amplitude end of the modulator chip (24) is connected with the bias control unit (5) and is used for adjusting the second-order MAX point of the modulator chip (24); the predistortion compensation unit (3) consists of a pre-amplification circuit (31), a second-order predistortion compensation circuit (32) and a third-order predistortion compensation circuit (33), and an optical carrier signal entering the amplification equalization circuit (23) is processed in an inverting mode and then part of the optical carrier signal enters the drive amplification circuit (33).
2. The feed-forward post-compensation linearization radio frequency optical transmitter in accordance with claim 1, wherein the temperature controller (11) comprises a temperature detector, a controller, and a refrigerator.
3. The feed-forward post-compensation linearization radio frequency optical transmitter in accordance with claim 1, characterized in that the modulator chip (24) is integrated with a phase modulator connected to the SBS suppression unit (4) for SBS suppression of the optical link.
4. A method for improving feedforward post-compensation linearization radio frequency light, characterized in that the feedforward post-compensation linearization radio frequency light transmitter as claimed in any one of claims 1 to 3 is adopted, and the following steps are adopted:
radio frequency input signal U 301 Is input from a port (301) and is subjected to a predistortion compensation unit (3) and a laser unit (1) to generate a second-order intermodulation signal U 101 A signal U entering the complex modulator unit (2) and entering the complex modulator unit (2) 101 After beam splitting by a beam splitter (21), a first branch signal U 201 Modulated by a modulator chip (24), the modulated signal generates a second-order phase signal U 24 The other part of the signals enter an amplifying and equalizing circuit (23) through a light detector (22) to output a second branch signal U 202 Is processed in reverse phase and then enters into a modulator chip (24), two parts of light entering into the modulator chip (24) have the same amplitude and opposite phases, and the modulator chip (24) obtains an output signal U 203 。
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| US7426350B1 (en) * | 2001-10-26 | 2008-09-16 | Cisco Technology, Inc. | Hybrid optical and electrical fiber optic link linearizer |
| CN202268889U (en) * | 2011-10-22 | 2012-06-06 | 杭州通兴电子有限公司 | 1550nm high-power external modulation optical transmitter |
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