CN113098619A - Single sideband modulation device capable of adjusting carrier sideband suppression ratio - Google Patents

Single sideband modulation device capable of adjusting carrier sideband suppression ratio Download PDF

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CN113098619A
CN113098619A CN202010020683.2A CN202010020683A CN113098619A CN 113098619 A CN113098619 A CN 113098619A CN 202010020683 A CN202010020683 A CN 202010020683A CN 113098619 A CN113098619 A CN 113098619A
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modulator
polarization controller
radio frequency
dual
electric bridge
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王创业
宁提纲
李晶
裴丽
郑晶晶
王均宏
李雨键
艾渤
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Beijing Jiaotong University
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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
    • 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
    • H04B10/504—Laser transmitters using direct modulation
    • 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
    • H04B10/548—Phase or frequency modulation
    • H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]

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Abstract

The invention relates to a single sideband modulation device capable of tuning a carrier sideband suppression ratio. The device includes: the continuous wave laser device comprises a continuous wave laser 1, a polarization controller 2, a signal generator 3, a 90-degree electric bridge 4, a DP-BPSK modulator 5, a polarization controller 6 and a linear polarizer 7. The OCSR-tunable single sideband modulation signal can be generated by adjusting the angle of the polarization controller 6. The device has simple structure and simple operation, and has no limit on the bandwidth of radio frequency signals.

Description

Single sideband modulation device capable of adjusting carrier sideband suppression ratio
Technical Field
The invention relates to a single sideband modulator with tunable carrier sideband suppression ratio, and relates to the technical field of photoelectronic devices and microwave photonics.
Background
Single sideband modulation is an important research direction in the field of microwave photonics, and has a plurality of important applications, such as photonic filters, power attenuation elimination of ROF systems caused by chromatic dispersion, photon frequency down-conversion, optical vector network analyzers, optical fiber sensors and the like. In recent years researchers have proposed a number of approaches to achieving single sideband modulation. In 2011, Bouchaib Hraimel et al proposed a Single Sideband Modulation method using an I/Q modulator to achieve adjustable Carrier-to-Sideband suppression Ratio (OCSR) (b.hraimel, x.zhang, y.pei, k.wu, t.liu, t.xu, q.nie, Optical Single-band Modulation With adjustable Optical Carrier to channel Ratio in Radio Over Fiber Systems, Journal of light Technology 29(5) (2011) (775) -. In 2013, Lijing et al implemented OCSR tunable single sideband modulation (J.Li, T.Ning, L.Pei, S.Gao, H.you, H.Chen, N.Jia, Performance analysis of an optical single band modulation with a tunable optical carrier-to-side band ratio, Optics & Laser Technology 48(2013) 210-. In 2014, Yamei Zhang et al implemented OCSR Tunable Single Sideband Modulation using two cascaded polarization modulators (PolM) and a linear polarizer, and the OCSR ranged from-26 dB to 46dB (Y.Zhang, F.Zhang, S.Pan, Optical Single side band Modulation With Tunable Optical Carrier-to-silicon Ratio, IEEE Photonics Technology Letters 26(7) (2014) 653-. In 2017, Beilei Wu et al put a dual parallel mach-zehnder modulator into the Sagnac loop, implementing OCSR tunable single sideband modulation (b.wu, m.wang, y.tang, j.sun, j.zhang, f.yan, s.jian, Optical single band modulation with a tunable Optical carrier-to-side band ratio using a modulator in a Sagnac loop, Optics & Laser Technology 91(2017) 98-102.). In the same year, ZHENGXue Peng et al realized OCSR tunable single sideband modulation using a dual polarization modulator (Z.Peng, A.Wen, Y.Gao, Z.Tu, W.Chen, W.J.M.Zhang, O.T.letters, A novel method to a real optical fiber band modulation with a thin optical carrier to a single band ratio,59(7) (2017) 1740-.
Disclosure of Invention
The invention provides a single sideband modulation device with a simple structure and a tunable carrier sideband suppression ratio.
The purpose of the invention is realized by the following technical scheme:
a single sideband modulation device capable of adjusting carrier sideband suppression ratio is characterized in that: the device comprises a continuous wave laser 1, a polarization controller 2, a signal generator 3, a 90-degree electric bridge 4, a DP-BPSK modulator 5, a polarization controller 6 and a linear polarizer 7, wherein the specific connection mode is as follows:
an output port of the continuous wave laser 1 is connected with an optical input port of a DP-BPSK modulator 5 through a polarization controller 2, an output port of a signal generator 3 is connected with an input port of a 90-degree electric bridge 4, two output ports of the 90-degree electric bridge 4 are connected with two radio frequency input ports of a dual-drive Mach-Zehnder modulator (52) in the DP-BPSK modulator 5, and the dual-drive Mach-Zehnder modulator (53) does not perform radio frequency modulation. The output port of the DP-BPSK modulator 5 is connected to the input port of the linear polarizer 7 via the polarization controller 6.
The continuous wave laser 1 and the polarization controller 2, the polarization controller 2 and the DP-BPSK modulator 5, the DP-BPSK modulator 5 and the polarization modulator 6, and the polarization modulator 6 and the linear polarizer 7 are all connected by optical fibers. The signal generator 3 and the 90-degree electric bridge, and the 90-degree electric bridge and the DP-BPSK modulator 5 are connected by radio frequency connecting wires.
The continuous wave laser 1 generates an optical signal of a fixed wavelength, providing a carrier wave.
The signal generator 3 generates a radio frequency signal.
The DP-BPSK modulator 5 modulates an optical carrier by a radio frequency signal.
The polarization controller 6 changes the polarization state of the optical signal by the rotation angle.
The linear polarizer 7 combines the light of each polarization state into light of one polarization state.
An optical signal emitted by the continuous wave laser 1 passes through the polarization controller 2 and then is input into the DP-BPSK modulator 5 for modulation, radio frequency generated by the signal generator 3 passes through the 90-degree electric bridge 4 and then is divided into two paths of orthogonal radio frequency signals, the two paths of orthogonal radio frequency signals are loaded on two radio frequency input ports of a dual-drive Mach-Zehnder modulator 52 of the DP-BPSK modulator, and the dual-drive Mach-Zehnder modulator 52 is set to be in an orthogonal bias state. The other dual drive mach-zehnder modulator 53 does not perform rf modulation and does not apply a dc bias (corresponding to being at the maximum transmission point). Ignoring the high-order sidebands, and considering only the carrier and the first-order sidebands, the dual-drive mach-zehnder modulator 52 generates the carrier and a first-order sideband signal, the mach-zehnder modulator 53 generates only the carrier signal, and the two signals are output from the DP-BPSK modulator 5 in an orthogonal state. The rear signal passes through a polarization controller 6 and a linear polarizer 7, and an OCSR tunable single sideband modulation signal can be generated by adjusting the angle of the polarization controller 6.
An optical signal sent by the continuous wave laser 1 enters the DP-BPSK modulator 5 after passing through the polarization controller 2, and an optical field expression of the optical signal sent by the continuous wave laser 1 is set as follows: ein＝E0exp(jω0t), the electric field expression of the radio frequency signal emitted by the signal generator 3 is expressed as: vRFsin(ωRFt)。
The DP-BPSK modulator 5 outputs the light field expression as:
Figure BDA0002360656790000041
wherein
Figure BDA0002360656790000042
anRepresenting the amplitude of the carrier and sidebands in the X-direction.
The output optical field of the optical signal output from the DP-BPSK modulator 5 after passing through the polarization controller 6 and the linear polarizer 7 is:
Figure BDA0002360656790000043
wherein
Figure BDA0002360656790000044
b0,b1Representing the amplitude of the carrier and first order sidebands, respectively. θ represents the angle of the polarization controller 6.
The expression of OCSR is:
Figure BDA0002360656790000051
with a fixed modulation factor, the OCSR can be tuned by adjusting the angle of the polarization controller 6.
The invention has the beneficial effects that:
the OCSR tunable range is as follows: 20dB to 38dB, and no limitation is placed on the bandwidth of the radio frequency signal.
Drawings
Fig. 1 is a schematic structural diagram of a single sideband modulation device with tunable carrier sideband suppression ratio.
FIG. 2 is a spectrum diagram of the output signal of the device according to the first embodiment.
FIG. 3 is a spectrum diagram of the output signal of the device in the second embodiment.
FIG. 4 is a spectrum diagram of the output signal of the device in the third embodiment.
FIG. 5 is a spectrum diagram of the output signal of the device in the fourth embodiment.
Wherein each icon is: the continuous wave laser device comprises a continuous wave laser 1, a polarization controller 2, a signal generator 3, a 90-degree electric bridge 4, a DP-BPSK modulator 5, a polarization controller 6 and a linear polarizer 7.
Detailed Description
The invention is further described below with reference to the figures and examples.
The first embodiment is as follows:
a single sideband modulation device capable of adjusting carrier sideband suppression ratio is characterized in that: the device comprises a continuous wave laser 1, a polarization controller 2, a signal generator 3, a 90-degree electric bridge 4, a DP-BPSK modulator 5, a polarization controller 6 and a linear polarizer 7, wherein the specific connection mode is as follows:
an output port of the continuous wave laser 1 is connected with an optical input port of a DP-BPSK modulator 5 through a polarization controller 2, an output port of a signal generator 3 is connected with an input port of a 90-degree electric bridge 4, two output ports of the 90-degree electric bridge 4 are connected with two radio frequency input ports of a dual-drive Mach-Zehnder modulator (52) in the DP-BPSK modulator 5, and the dual-drive Mach-Zehnder modulator (53) does not perform radio frequency modulation. The output port of the DP-BPSK modulator 5 is connected to the input port of the linear polarizer 7 via the polarization controller 6.
The continuous wave laser 1 and the polarization controller 2, the polarization controller 2 and the DP-BPSK modulator 5, the DP-BPSK modulator 5 and the polarization modulator 6, and the polarization modulator 6 and the linear polarizer 7 are all connected by optical fibers. The signal generator 3 and the 90-degree electric bridge, and the 90-degree electric bridge and the DP-BPSK modulator 5 are connected by radio frequency connecting wires.
The continuous wave laser 1 generates an optical signal of a fixed wavelength, providing a carrier wave.
The signal generator 3 generates a radio frequency signal.
The DP-BPSK modulator 5 modulates an optical carrier by a radio frequency signal.
The polarization controller 6 changes the polarization state of the optical signal by the rotation angle.
The linear polarizer 7 combines the light of each polarization state into light of one polarization state.
The dual drive mach-zehnder modulator 52 is biased at the quadrature transmission point and the dual drive mach-zehnder modulator 53 is biased at the maximum transmission point. The modulation factor is set to 0.5 and the extinction ratio of the mach-zehnder modulators (52 and 53) is set to 30 dB. The wavelength and power of the output optical signal of the continuous wave laser were set to 1550.12nm and 0dBm, respectively. The frequency of the radio frequency signal output by the signal generator is set to 10 GHz.
The angle of the polarization controller 6 was adjusted to 34 °, and the output spectrum of the device is shown in fig. 2.
Example two:
a single sideband modulation device capable of adjusting carrier sideband suppression ratio is characterized in that: the device comprises a continuous wave laser 1, a polarization controller 2, a signal generator 3, a 90-degree electric bridge 4, a DP-BPSK modulator 5, a polarization controller 6 and a linear polarizer 7, wherein the specific connection mode is as follows:
an output port of the continuous wave laser 1 is connected with an optical input port of a DP-BPSK modulator 5 through a polarization controller 2, an output port of a signal generator 3 is connected with an input port of a 90-degree electric bridge 4, two output ports of the 90-degree electric bridge 4 are connected with two radio frequency input ports of a dual-drive Mach-Zehnder modulator (52) in the DP-BPSK modulator 5, and the dual-drive Mach-Zehnder modulator (53) does not perform radio frequency modulation. The output port of the DP-BPSK modulator 5 is connected to the input port of the linear polarizer 7 via the polarization controller 6.
The continuous wave laser 1 and the polarization controller 2, the polarization controller 2 and the DP-BPSK modulator 5, the DP-BPSK modulator 5 and the polarization modulator 6, and the polarization modulator 6 and the linear polarizer 7 are all connected by optical fibers. The signal generator 3 and the 90-degree electric bridge, and the 90-degree electric bridge and the DP-BPSK modulator 5 are connected by radio frequency connecting wires.
The continuous wave laser 1 generates an optical signal of a fixed wavelength, providing a carrier wave.
The signal generator 3 generates a radio frequency signal.
The DP-BPSK modulator 5 modulates an optical carrier by a radio frequency signal.
The polarization controller 6 changes the polarization state of the optical signal by the rotation angle.
The linear polarizer 7 combines the light of each polarization state into light of one polarization state.
The dual drive mach-zehnder modulator 52 is biased at the quadrature transmission point and the dual drive mach-zehnder modulator 53 is biased at the maximum transmission point. The modulation factor is set to 0.5 and the extinction ratio of the mach-zehnder modulators (52 and 53) is set to 30 dB. The wavelength and power of the output optical signal of the continuous wave laser were set to 1550.12nm and 0dBm, respectively. The frequency of the radio frequency signal output by the signal generator is set to 10 GHz.
The angle of the polarization controller 6 was adjusted to 42 °, and the output spectrum of the device is shown in fig. 3.
Example three:
a single sideband modulation device capable of adjusting carrier sideband suppression ratio is characterized in that: the device comprises a continuous wave laser 1, a polarization controller 2, a signal generator 3, a 90-degree electric bridge 4, a DP-BPSK modulator 5, a polarization controller 6 and a linear polarizer 7, wherein the specific connection mode is as follows:
an output port of the continuous wave laser 1 is connected with an optical input port of a DP-BPSK modulator 5 through a polarization controller 2, an output port of a signal generator 3 is connected with an input port of a 90-degree electric bridge 4, two output ports of the 90-degree electric bridge 4 are connected with two radio frequency input ports of a dual-drive Mach-Zehnder modulator (52) in the DP-BPSK modulator 5, and the dual-drive Mach-Zehnder modulator (53) does not perform radio frequency modulation. The output port of the DP-BPSK modulator 5 is connected to the input port of the linear polarizer 7 via the polarization controller 6.
The continuous wave laser 1 and the polarization controller 2, the polarization controller 2 and the DP-BPSK modulator 5, the DP-BPSK modulator 5 and the polarization modulator 6, and the polarization modulator 6 and the linear polarizer 7 are all connected by optical fibers. The signal generator 3 and the 90-degree electric bridge, and the 90-degree electric bridge and the DP-BPSK modulator 5 are connected by radio frequency connecting wires.
The continuous wave laser 1 generates an optical signal of a fixed wavelength, providing a carrier wave.
The signal generator 3 generates a radio frequency signal.
The DP-BPSK modulator 5 modulates an optical carrier by a radio frequency signal.
The polarization controller 6 changes the polarization state of the optical signal by the rotation angle.
The linear polarizer 7 combines the light of each polarization state into light of one polarization state.
The dual drive mach-zehnder modulator 52 is biased at the quadrature transmission point and the dual drive mach-zehnder modulator 53 is biased at the maximum transmission point. The modulation factor is set to 0.5 and the extinction ratio of the mach-zehnder modulators (52 and 53) is set to 30 dB. The wavelength and power of the output optical signal of the continuous wave laser were set to 1550.12nm and 0dBm, respectively. The frequency of the radio frequency signal output by the signal generator is set to 10 GHz.
The angle of the polarization controller 6 was adjusted to 53.5 deg., and the output spectrum of the device was as shown in fig. 4.
Example four:
a single sideband modulation device capable of adjusting carrier sideband suppression ratio is characterized in that: the device comprises a continuous wave laser 1, a polarization controller 2, a signal generator 3, a 90-degree electric bridge 4, a DP-BPSK modulator 5, a polarization controller 6 and a linear polarizer 7, wherein the specific connection mode is as follows:
an output port of the continuous wave laser 1 is connected with an optical input port of a DP-BPSK modulator 5 through a polarization controller 2, an output port of a signal generator 3 is connected with an input port of a 90-degree electric bridge 4, two output ports of the 90-degree electric bridge 4 are connected with two radio frequency input ports of a dual-drive Mach-Zehnder modulator (52) in the DP-BPSK modulator 5, and the dual-drive Mach-Zehnder modulator (53) does not perform radio frequency modulation. The output port of the DP-BPSK modulator 5 is connected to the input port of the linear polarizer 7 via the polarization controller 6.
The continuous wave laser 1 and the polarization controller 2, the polarization controller 2 and the DP-BPSK modulator 5, the DP-BPSK modulator 5 and the polarization modulator 6, and the polarization modulator 6 and the linear polarizer 7 are all connected by optical fibers. The signal generator 3 and the 90-degree electric bridge, and the 90-degree electric bridge and the DP-BPSK modulator 5 are connected by radio frequency connecting wires.
The continuous wave laser 1 generates an optical signal of a fixed wavelength, providing a carrier wave.
The signal generator 3 generates a radio frequency signal.
The DP-BPSK modulator 5 modulates an optical carrier by a radio frequency signal.
The polarization controller 6 changes the polarization state of the optical signal by the rotation angle.
The linear polarizer 7 combines the light of each polarization state into light of one polarization state.
The dual drive mach-zehnder modulator 52 is biased at the quadrature transmission point and the dual drive mach-zehnder modulator 53 is biased at the maximum transmission point. The modulation factor is set to 0.5 and the extinction ratio of the mach-zehnder modulators (52 and 53) is set to 30 dB. The wavelength and power of the output optical signal of the continuous wave laser were set to 1550.12nm and 0dBm, respectively. The frequency of the radio frequency signal output by the signal generator is set to 10 GHz.
The angle of the polarization controller 6 was adjusted to 87 °, and the output spectrum of the device is shown in fig. 5.

Claims (4)

1. A single sideband modulation device capable of adjusting carrier sideband suppression ratio is characterized in that: the device comprises a continuous wave laser (1), a polarization controller (2), a signal generator (3), a 90-degree electric bridge (4), a DP-BPSK modulator (5), a polarization controller (6) and a linear polarizer (7), wherein the specific connection mode is as follows:
an output port of the continuous wave laser 1 is connected with an optical input port of a DP-BPSK modulator 5 through a polarization controller 2, an output port of a signal generator 3 is connected with an input port of a 90-degree electric bridge 4, two output ports of the 90-degree electric bridge 4 are connected with two radio frequency input ports of a dual-drive Mach-Zehnder modulator (52) in the DP-BPSK modulator 5, the dual-drive Mach-Zehnder modulator (53) does not perform radio frequency modulation, and an output port of the DP-BPSK modulator 5 is connected with an input port of a linear polarizer 7 through a polarization controller 6.
2. A single sideband modulation device capable of adjusting carrier sideband suppression ratio according to claim 1, characterized in that: two radio frequency output ports of the 90-degree electric bridge 4 are connected with two radio frequency input ports of the dual-drive Mach-Zehnder modulator 51, and the dual-drive Mach-Zehnder modulator (53) does not perform radio frequency modulation.
3. A single sideband modulation device capable of adjusting carrier sideband suppression ratio according to claim 1, characterized in that: the dual drive mach-zehnder modulator (52) is biased at a quadrature bias point and the dual drive mach-zehnder modulator (53) is biased at a maximum transmission point.
4. A single sideband modulation device capable of adjusting carrier sideband suppression ratio according to claim 1, characterized in that: by adjusting the angle of the polarization controller 6 from 34 ° to 89 °, the OCSR tunable range of the single sideband modulated signal can reach-20 dB to 38 dB.
CN202010020683.2A 2020-01-09 2020-01-09 Single sideband modulation device capable of adjusting carrier sideband suppression ratio Pending CN113098619A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6262834B1 (en) * 2000-02-23 2001-07-17 The United States Of America As Represented By The Secretary Of The Navy Wideband single sideband modulation of optical carriers
CN106468834A (en) * 2016-09-19 2017-03-01 西安电子科技大学 Micro-wave light quantum phase shifter based on dual-polarization manipulator
CN107846254A (en) * 2017-10-12 2018-03-27 北京工业大学 The photonic methodologies and system of microwave down coversion and phase shift are realized using integrated device
CN107947866A (en) * 2017-12-20 2018-04-20 西安电子科技大学 Based on dual-polarization modulator carrier wave sideband optical SSB modulation method more adjustable than dynamic
CN110278035A (en) * 2019-05-31 2019-09-24 华东师范大学 A kind of high spectrum efficiency microwave homogenous frequency signal interference rejection unit and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6262834B1 (en) * 2000-02-23 2001-07-17 The United States Of America As Represented By The Secretary Of The Navy Wideband single sideband modulation of optical carriers
CN106468834A (en) * 2016-09-19 2017-03-01 西安电子科技大学 Micro-wave light quantum phase shifter based on dual-polarization manipulator
CN107846254A (en) * 2017-10-12 2018-03-27 北京工业大学 The photonic methodologies and system of microwave down coversion and phase shift are realized using integrated device
CN107947866A (en) * 2017-12-20 2018-04-20 西安电子科技大学 Based on dual-polarization modulator carrier wave sideband optical SSB modulation method more adjustable than dynamic
CN110278035A (en) * 2019-05-31 2019-09-24 华东师范大学 A kind of high spectrum efficiency microwave homogenous frequency signal interference rejection unit and method

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