CN111371500B - PDM-MZM-based high-linearity radio-over-optical link device and method - Google Patents

PDM-MZM-based high-linearity radio-over-optical link device and method Download PDF

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CN111371500B
CN111371500B CN202010172729.2A CN202010172729A CN111371500B CN 111371500 B CN111371500 B CN 111371500B CN 202010172729 A CN202010172729 A CN 202010172729A CN 111371500 B CN111371500 B CN 111371500B
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CN111371500A (en
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高永胜
王瑞琼
郝润林
谭庆贵
张君昌
樊养余
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Northwestern Polytechnical University
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Abstract

The invention provides a high-linearity optical carrier radio frequency link device and a method based on a PDM-MZM.A output port of an LD is connected with an optical signal input end of the PDM-MZM; the PDM-MZM optical signal output end is connected to the common input end of the EDFA after being transmitted by the single-mode fiber; the output end of the EDFA is connected with the PD, the output end of the PD outputs an RF signal after IMD3 suppression, the RF signal is connected with the common end of the electric power divider, one output end of the electric power divider is connected with any electrode of the MZM1, the other output port of the electric power divider is connected with the input end of the electric attenuator, and the output end of the electric attenuator is connected with any electrode of the MZM 2. The invention has simple structure and strong operability, directly adopts the integrated PDM-MZM, greatly reduces the structure complexity and the system volume, reduces the cost, adopts single-electrode input for the neutron modulator, avoids using a phase inverter, reduces the link loss and has simple experimental operation.

Description

PDM-MZM-based high-linearity radio-over-optical link device and method
Technical Field
The present invention relates to the field of microwave technology and the field of optical communication technology, and in particular, to a Radio Over Fiber (ROF) link apparatus and method.
Background
The optical carrier radio frequency technology is considered as one of the key technologies of future high-frequency, broadband and high-speed wireless broadband communication, taking advantage of the characteristics of low loss, large capacity, long distance and no electromagnetic interference of optical fiber transmission and people's uninterrupted exploration in the field of microwave photonics.
The ROF communication technology has a plurality of advantages and good development prospect. However, due to inherent nonlinearity of devices such as an electro-optical modulator and a photodetector in the ROF system, a Radio Frequency (RF) signal may generate a nonlinear effect after being transmitted through the ROF link, and introduce various-order Distortion, especially Third-order Intermodulation Distortion (IMD 3). These non-linear distortions not only reduce the power of the RF signal, but also limit the Spurious Free Dynamic Range (SFDR) of the ROF system to some extent, severely affecting the system performance, and greatly reducing the application Range of the ROF communication technology.
Existing optical domain linearity optimization schemes are mostly implemented by generating a complementary IMD3 term to cancel the existing IMD3 term. Such methods include parallel modulators, series modulators, sagnac loop based, fiber bragg grating based, and the like. Not only are complex modulators required, but also the exact matching of the parallel links is difficult to achieve, greatly increasing the experimental complexity and link cost when compensated with additional optics.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a high-linearity radio frequency link device and a method for an optical carrier based on a Polarization Multiplexing Ma Zeng Modulator (PDM-MZM). By adjusting the modulation index and the bias angle of an RF signal in a PDM-MZM sub-Modulator, an inverse distortion signal is constructed to offset IMD3 of a link, so that the link linearity is improved, and the SFDR is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a high-linearity light-carrying radio frequency link device based on PDM-MZM comprises a Laser Diode (LD), a PDM-MZM, an electric power divider, an electric attenuator, an Erbium Doped Fiber Amplifier (EDFA), and a Photodetector (PD); the output port of the LD is connected with the optical signal input end of the PDM-MZM; the PDM-MZM optical signal output end is connected to the common input end of the EDFA after being transmitted by Single Mode Fiber (SMF); the output end of the EDFA is connected with the PD, and the PD output end outputs the RF signal after IMD3 suppression;
the PDM-MZM comprises a Y-type optical Beam splitter, two sub-modulators connected in parallel up and down and a Polarization Beam Combiner (PBC), wherein the two sub-modulators are MZM1 and MZM2 respectively, two arms of the Y-type optical Beam splitter are connected with the two sub-modulators respectively, output optical signals of the two sub-modulators are subjected to polarization multiplexing by using the polarization Beam Combiner, the MZM1 and the MZM2 are both double-electrode modulators, and the MZM1 and the MZM2 respectively comprise two radio-frequency electrodes;
the RF signal is connected with the common end of the electric power divider, one output end of the electric power divider is connected with any electrode of the MZM1, the other output port of the electric power divider is connected with the input end of the electric attenuator, and the output end of the electric attenuator is connected with any electrode of the MZM 2.
The invention also provides a method for relating to a high-linearity optical carrier radio frequency link device based on the PDM-MZM, which specifically comprises the following steps:
step 1: injecting the continuous optical carrier output from the LD into the PDM-MZM;
the LD output light signal is represented as
Figure BDA0002409751670000021
Wherein E c Is the electric field amplitude, omega, of the optical signal c Is the angular frequency of the optical signal, the radio frequency signal (RF 1) input to MZM1 being denoted V 1 s (t), the radio frequency signal (RF 2) input to MZM2 is denoted as V 2 s(t)，V 1 ，V 2 Respectively, the amplitude of the radio frequency signal, s (t) = cos omega 1 t+cosω 2 t is a diphone signal, ω 1 And omega 2 For the two angular frequencies of the two-tone signal,
Figure BDA0002409751670000022
is the modulation index of two sub-modulators, where V π Is a half-wave voltage;
step 2: the RF signal is divided into two paths through the electric power divider, one path is directly input into the MZM1, and the other path is connected with the MZM2 after passing through the electric attenuator;
the output optical field of MZM1 is represented as:
Figure BDA0002409751670000023
similarly, the optical field output by MZM2 is represented as:
Figure BDA0002409751670000024
and step 3: the direct current bias angles of MZM1 and MZM2 are respectively alpha 1 、α 2 The direct current voltages of the two sub-modulators MZM1 and MZM2 are respectively controlled;
and 4, step 4: optical signals output by the two sub-modulators are subjected to PBC polarization multiplexing and then output to a PDM-MZM, then enter an EDFA for power compensation, and then enter a PD for photoelectric detection to obtain a recovered RF signal;
the current obtained after PD is expressed as:
Figure BDA0002409751670000031
taylor expansion is carried out on the formula (3), and a two-tone signal s (t) = cos omega 1 t+cosω 2 Substituting t to obtain a third-order intermodulation coefficient of the output RF signal as follows:
Figure BDA0002409751670000032
the fundamental term coefficients of the output RF signal are:
Figure BDA0002409751670000033
adjusting attenuator and bias point alpha 1 、α 2 So that it satisfies the following conditions: :
Figure BDA0002409751670000034
by the constraint condition of the formula (6), the suppression of the third-order intermodulation can be realized under the condition that the fundamental wave term of the output RF signal is not zero, and the linearity and SFDR of the link are improved.
The invention has the advantages that through adjusting the modulation index and the bias angle of the RF signal in the two sub-modulators, the inverse distortion signal is constructed to counteract the nonlinearity of the link, finally the suppression of the IMD3 of the system is realized, and the linearity is further improved. The invention has simple structure and strong operability, can directly adopt the integrated PDM-MZM, greatly reduces the structure complexity and the system volume, and reduces the cost.
Drawings
FIG. 1 is a diagram of a PDM-MZM-based high-linearity RF-over-optical link apparatus according to the present invention;
fig. 2 is a graph comparing spectra of output RF signals, fig. 2 (a) is an RF signal output by a single MZM link, and fig. 2 (b) is an RF signal output by a PDM-MZM-based high-linearity optical radio frequency link apparatus according to the present invention.
FIG. 3 is the SFDR achievable by a single MZM link;
FIG. 4 is a diagram illustrating the SFDR that can be achieved by the PDM-MZM-based high-linearity RF-over-fiber link apparatus of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The technical scheme adopted by the invention is as follows:
a high-linearity light-carrying radio frequency link device based on PDM-MZM comprises a Laser Diode (LD), a PDM-MZM, an electric power divider, an electric attenuator, an Erbium Doped Fiber Amplifier (EDFA), and a Photodetector (PD); the output port of the LD is connected with the optical signal input end of the PDM-MZM; the PDM-MZM optical signal output end is connected to the public input end of the EDFA after being transmitted by a Single Mode Fiber (SMF); the output end of the EDFA is connected with the PD, and the PD output end outputs the RF signal after IMD3 inhibition;
the PDM-MZM comprises a Y-type optical Beam splitter, two sub-modulators connected in parallel up and down and a Polarization Beam Combiner (PBC), wherein the two sub-modulators are respectively MZM1 and MZM2, two arms of the Y-type optical Beam splitter are respectively connected with the two sub-modulators, output optical signals of the two sub-modulators are subjected to polarization multiplexing by using the polarization Beam Combiner, the MZM1 and the MZM2 are respectively dual-electrode modulators, and the MZM1 and the MZM2 respectively comprise two radio-frequency electrodes;
the RF signal is connected with the common end of the electric power divider, one output end of the electric power divider is connected with any electrode of the MZM1, the other output port of the electric power divider is connected with the input end of the electric attenuator, and the output end of the electric attenuator is connected with any electrode of the MZM 2.
A method for realizing a PDM-MZM-based high-linearity radio-over-optical link device comprises the following steps:
step 1: injecting the continuous optical carrier output from the LD into the PDM-MZM;
the LD output light signal is expressed as
Figure BDA0002409751670000041
Wherein E c Is the electric field amplitude, omega, of the optical signal c Is the angular frequency of the optical signal, the radio frequency signal (RF 1) input to MZM1 being denoted V 1 s (t), the radio frequency signal (RF 2) input to MZM2 being denoted as V 2 s(t)，V 1 ，V 2 Respectively, the amplitude of the radio frequency signal, s (t) = cos omega 1 t+cosω 2 t is a diphone signal, ω 1 And ω 2 For the two angular frequencies of the two-tone signal,
Figure BDA0002409751670000042
is the modulation index of two sub-modulators, where V π Is a half-wave voltage;
and 2, step: the RF signal is divided into two paths through the electric power divider, one path is directly input into the MZM1, and the other path is connected with the MZM2 after passing through the electric attenuator;
the output optical field of MZM1 is represented as:
Figure BDA0002409751670000043
similarly, the optical field output by MZM2 is represented as:
Figure BDA0002409751670000051
and step 3: the direct current bias angles of MZM1 and MZM2 are respectively alpha 1 、α 2 The direct current voltages of the two sub-modulators MZM1 and MZM2 are respectively controlled;
and 4, step 4: optical signals output by the two sub-modulators are subjected to PBC polarization multiplexing and then output to a PDM-MZM, then enter an EDFA for power compensation, and then enter a PD for photoelectric detection to obtain a recovered RF signal;
the current obtained after PD is expressed as:
Figure BDA0002409751670000052
taylor expansion is carried out on the formula (3), and a two-tone signal s (t) = cos omega 1 t+cosω 2 Substituting t to obtain a third-order intermodulation coefficient of the output RF signal as follows:
Figure BDA0002409751670000053
the fundamental term coefficients of the output RF signal are:
Figure BDA0002409751670000054
adjusting attenuator and bias point alpha 1 、α 2 So that it satisfies the following conditions: :
Figure BDA0002409751670000055
by the constraint condition of the formula (6), the suppression of the third-order intermodulation can be realized under the condition that the fundamental wave term of the output RF signal is not zero, and the linearity and SFDR of the link are improved.
In this embodiment, the apparatus includes: LD, PDM-MZM, EDFA, PD, RF signal source, electric power divider, adjustable electric attenuator, spectrum analyzer. The output port of the LD is connected with the optical signal input end of the PDM-MZM through a polarization maintaining optical fiber; the PDM-MZM output port is connected with the input end of the EDFA; the output end of the EDFA is connected with the optical signal input end of the PD, and the electrical output end of the PD is connected with the spectrum analyzer. The RF signal source is connected with the common end of the electric power divider, one output end of the electric power divider is connected with one radio frequency port of the MZM1, the other output end of the electric power divider is connected with the input end of the electric attenuator, and the output end of the electric attenuator is connected with one radio frequency port of the MZM 2.
In the embodiment, the method comprises the following specific implementation steps:
the method comprises the following steps: the output wavelength of the continuous optical carrier generated by the LD is 1551nm, and the power is 40mw; the frequency of the double-tone radio frequency signal generated by the RF signal source is 20GHz and 20.1GHz, and the adjustable range of power is-20 dBm to +20dBm; the PDM-MZM half-wave voltage is 3.5V, the insertion loss is 6dB, and the extinction ratio is 20dB; the PD bandwidth is 43GHz, the responsivity is 0.45A/W, and the output power of the EDFA is 20dBm.
Step two: setting the attenuation value of the adjustable electric attenuator to be 6dB and arbitrarily fixing the MZM1 direct-current bias angle alpha 1 Adjusting the DC bias angle alpha of MZM2 2 So that it satisfies condition (6) to minimize the third order intermodulation distortion observed in the spectrum analyzer.
Step three: replace PDM-MZM with single MZM as a comparison link. The spectrum of the RF signal output by the single MZM link is shown in fig. 2 (a), and it can be seen that there is a significant IMD3, and the rejection ratio of the fundamental to IMD3 is only 33.9dB. The spectrum of the RF signal output by the apparatus of the present invention is shown in fig. 2 (b), and the suppression ratio of the fundamental wave to IMD3 reaches 64.4dB. It can be concluded that the device of the present invention has a significant inhibitory effect on IMD 3.
Step four: and changing the power of the RF signal of the input link, measuring the fundamental power, IMD3 and noise of the output RF signal respectively, and measuring and calculating the SFDR of the link. The SFDR of the single MZM link is shown in FIG. 3 as 93.8dBz2/3. As shown in FIG. 4, the SFDR of the device of the present invention reaches 109.5dBHz2/3, and the SFDR of the device of the present invention is significantly improved.
In conclusion, the PDM-MZM-based high-linearity optical radio-frequency link device and the method are simple and easy to implement, can effectively inhibit IMD3, and improve SFDR.
In conclusion, the above-described embodiments are only examples of the present invention and are not intended to limit the scope of the present invention, it should be noted that several equivalent modifications and substitutions can be made by those skilled in the art in the light of the present disclosure, and the laser wavelength and power, RF signal frequency and power, RF power dividing ratio, bias angle of two sub-modulators, etc. can be changed. Such equivalent modifications and substitutions, as well as adjustments to the frequency range, should also be considered to be within the scope of the present invention.

Claims (2)

1. A method for realizing a PDM-MZM-based high-linearity radio-over-optical link device is characterized by comprising the following steps:
step 1: injecting the continuous optical carrier output from the LD into the PDM-MZM;
the LD output light signal is expressed as
Figure FDA0003934379990000011
Wherein E c Is the electric field amplitude, omega, of the optical signal c Is the angular frequency of the optical signal, the radio frequency signal RF1 input to MZM1 being denoted V 1 s (t), the radio frequency signal RF2 input to MZM2 being denoted as V 2 s(t)，V 1 ,V 2 Amplitude of the radio frequency signals RF1 and RF2, respectively, s (t) = cos ω 1 t+cosω 2 t is a diphone signal, ω 1 And ω 2 For the two angular frequencies of the two-tone signal,
Figure FDA0003934379990000012
being the modulation index of the sub-modulator MZM1,
Figure FDA0003934379990000013
is the modulation index of the sub-modulator MZM2, where V π Is a half-wave voltage;
step 2: the RF signal is divided into two paths through the electric power divider, one path is directly input into the MZM1, and the other path is connected with the MZM2 after passing through the electric attenuator;
the output optical field of MZM1 is represented as:
Figure FDA0003934379990000014
similarly, the optical field output by MZM2 is represented as:
Figure FDA0003934379990000015
and 3, step 3: the direct current bias angles of MZM1 and MZM2 are respectively alpha 1 、α 2 The direct current voltages of the two sub-modulators MZM1 and MZM2 are respectively controlled;
and 4, step 4: the optical signals output by the two sub-modulators are subjected to polarization multiplexing by a polarization beam combiner and then output to a PDM-MZM, then enter an EDFA for power compensation, and then enter a PD for photoelectric detection to obtain a recovered RF signal;
the current obtained after PD is expressed as:
Figure FDA0003934379990000016
taylor expansion is carried out on the formula (3), and a two-tone signal s (t) = cos omega 1 t+cosω 2 Substituting t to obtain a third-order intermodulation coefficient of the output RF signal as follows:
Figure FDA0003934379990000017
the fundamental term coefficients of the output RF signal are:
Figure FDA0003934379990000021
adjusting attenuator and bias point alpha 1 、α 2 So that it satisfies the following conditions: :
Figure FDA0003934379990000022
through the constraint condition of the formula (6), the suppression of the third-order intermodulation can be realized under the condition that the fundamental wave term of the output RF signal is not zero, and the linearity and the spurious-free dynamic range of the link are improved.
2. A high linearity radio-over-optical link apparatus of a PDM-MZM using the method of claim 1, wherein:
the PDM-MZM-based high-linearity optical carrier radio frequency link device comprises a laser diode, a PDM-MZM, an electric power divider, an electric attenuator, an erbium-doped fiber amplifier and a photoelectric detector; the output port of the LD is connected with the optical signal input end of the PDM-MZM; the PDM-MZM optical signal output end is connected to the public input end of the EDFA after being transmitted by the single-mode fiber; the output end of the EDFA is connected with the PD, and the PD output end outputs the RF signal after IMD3 inhibition;
the PDM-MZM comprises a Y-type optical beam splitter, two sub-modulators and a polarization beam combiner, wherein the two sub-modulators are respectively MZM1 and MZM2, two arms of the Y-type optical beam splitter are respectively connected with the two sub-modulators, output optical signals of the two sub-modulators are subjected to polarization multiplexing by using the polarization beam combiner, the MZM1 and the MZM2 are both double-electrode modulators, and the MZM1 and the MZM2 respectively comprise two radio-frequency electrodes;
the RF signal is connected with the common end of the electric power divider, one output end of the electric power divider is connected with any electrode of the MZM1, the other output port of the electric power divider is connected with the input end of the electric attenuator, and the output end of the electric attenuator is connected with any electrode of the MZM 2.
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