CN114070409B - Triangular waveform generator with adjustable symmetry factor based on dual polarization modulator - Google Patents
Triangular waveform generator with adjustable symmetry factor based on dual polarization modulator Download PDFInfo
- Publication number
- CN114070409B CN114070409B CN202010757339.1A CN202010757339A CN114070409B CN 114070409 B CN114070409 B CN 114070409B CN 202010757339 A CN202010757339 A CN 202010757339A CN 114070409 B CN114070409 B CN 114070409B
- Authority
- CN
- China
- Prior art keywords
- electric
- phase shifter
- modulator
- input end
- output end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229940125730 polarisation modulator Drugs 0.000 title claims abstract description 63
- 230000009977 dual effect Effects 0.000 title claims abstract description 27
- 230000010287 polarization Effects 0.000 claims abstract description 61
- 230000003287 optical effect Effects 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims description 20
- 230000010363 phase shift Effects 0.000 claims description 14
- 230000000630 rising effect Effects 0.000 claims description 3
- 230000010365 information processing Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 230000008033 biological extinction Effects 0.000 description 8
- 238000003780 insertion Methods 0.000 description 8
- 230000037431 insertion Effects 0.000 description 8
- 230000014509 gene expression Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000035559 beat frequency Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 108010046685 Rho Factor Proteins 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000010076 replication Effects 0.000 description 1
Classifications
-
- 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
- H04B10/5053—Laser transmitters using external modulation using a parallel, i.e. shunt, combination of modulators
-
- 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
- H04B10/532—Polarisation modulation
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
A triangular waveform generator with adjustable symmetry factor based on dual polarization modulator. Relates to the fields of photoelectronic devices, microwave photonics, information processing and the like. The device comprises a continuous wave laser (1), a polarization controller (2), a radio frequency signal source (3), an electric power divider (4), an electric amplifier (5), an electric amplifier (6), an electric phase shifter (7), an electric phase shifter (8), a dual polarization modulator (9), a photoelectric detector (10) and an electric phase shifter (11); the dual-polarization modulator (9) consists of an optical power divider (91), a single-drive Mach-Zehnder modulator (92), a single-drive Mach-Zehnder modulator (93), a 90-degree polarization rotator (94) and a polarization beam combiner (95).
Description
Technical Field
The invention discloses a triangular waveform generator with adjustable symmetry factors based on a dual-polarization modulator, and relates to the fields of optoelectronic devices, microwave photonics, information processing and the like.
Background
Arbitrary waveform generation is an important research direction in the field of microwave photonics, and triangular waveform generation is an important point of research. The triangular waveform can be applied to the fields of radar systems, communication systems, signal processing (pulse compression, signal conversion, signal replication, optical signal frequency multiplication) and the like. The traditional method for generating the triangular waveform based on electronics has the problems of small bandwidth, low repetition rate of the generated triangular waveform and the like. Researchers in recent years have proposed methods based on photonics to triangulate waveforms, overcoming these shortcomings. One approach is to generate a triangular waveform using spectral shaping in combination with frequency-time mapping, first using a spectral shaper to cut the spectrum emitted by the light source into a triangular shaped envelope, which is then mapped from the frequency domain to the time domain to generate the triangular waveform. However, the method utilizes a spectrum shaping technology, the system is complex, and the duty ratio of the generated triangular wave is smaller than 1. More common and largely studied are methods based on external modulation: the light intensity of the output signal is approximately equal to the Fourier expansion of an ideal triangular wave after the radio frequency signal is modulated by the modulator, so that the generation of the triangular wave is realized. There are many ways to implement this approach, such as generating triangular waveforms with modulators in combination with dispersive fibers (J.Li, X.Zhang, B.Hraimel, T.Ning, L.Pei, and k.wu, "Performance Analysis of a Photonic-Assisted Periodic Triangular-Shaped Pulses Generator," j.lightwave technology.30, 1617-1624 (2012)); generating a triangular waveform by means of a modulator in combination with a filter (Y.Gao, A.Wen, W.Liu, H.Zhang, and s.xiang, "Photonic Generation of Triangular Pulses Based on Phase Modulation and Spectrum Manipulation," IEEE Photonics Journal 8,1-9 (2016)); generating triangular waveforms with a modulator in combination with some polarization devices (J.Li, T.Ning, L.Pei, W.Jian, H.You, H.Chen, and c.zhang, "Photonic-Assisted Periodic Triangular-Shaped Pulses Generation With Tunable Repetition Rate," IEEE Photonics Technology Letters 25,952-954 (2013)); triangular waveforms may also be generated based on a modulator alone or multiple modulators, for example: based on dual parallel Mach-Zehnder modulators (F.Zhang, X.Ge, S.Pan, triangular pulse generation using a dual-parallel Mach-Zehnder modulator driven by a single-Frequency radio Frequency signal, opt. Lett.38 (21) (2013) 4491-4493), based on quadrature phase shift keying modulators (Z.Zhu, S.Zhao, X.Li, K.Qu, T.Lin, frequency-doubled microwave waveforms generation using a dual-polarization quadrature phase shift keying modulator driven by a single Frequency radio Frequency signal, optics & Laser Technology 98 (2018) 397-403); however, the triangular waveforms generated by these schemes are symmetrical triangular waveforms (the symmetry factor is 50%), the symmetry factor is defined as the ratio of the time elapsed by the rising edge of the triangular waveform to the period of the triangular waveform, and the symmetry factor of the triangular waveforms generated by these schemes is not tunable, which limits the application range of the triangular waveforms. Researchers have also proposed many schemes for generating sawtooth waveforms based on external modulation methods (sawtooth waveforms can be considered triangular waveforms with a symmetry factor of 0%), such as generation of sawtooth waveforms achieved with two single drive Mach-zehnder modulators (Y.He, Y.Jiang, Y.Zi, G.Bai, J.Tian, Y.Xia, X.Zhang, R.Dong, and h.luo, "Photonic microwave waveforms generation based on two cascaded single-drive Mach-Zehnder modulators," opt.express 26,7829-7841 (2018)); the generation of sawtooth waveforms is achieved with a single drive Mach-Zehnder modulator in combination with some polarization devices (C.Wei, Y.Jiang, H.Luo, R.Dong, J.Tian, Y.Zi, H.Liu, and R.Wang, "Tunable microwave sawtooth waveform generation based on one single-drive Mach-Zehnder modulator," Opt.express 28,8098-8107 (2020)); however, the symmetry factor of the sawtooth waveform generated by these schemes is also not tunable, which limits the scope of application of the triangle waveform. The invention provides a triangular waveform generator with adjustable symmetry factors, which can generate triangular waveforms with symmetry factors from 0% to 100% by properly adjusting an electric amplifier 5, an electric amplifier 6, an electric phase shifter 7, an electric phase shifter 8 and an electric phase shifter 11.
Disclosure of Invention
The invention provides a triangular waveform generator with adjustable symmetry factors based on a dual-polarization modulator.
The invention is realized by the following technical scheme:
a dual polarization modulator-based triangular waveform generator with adjustable symmetry factors, characterized in that: the triangular waveform generator comprises a continuous wave laser 1, a polarization controller 2, a radio frequency signal source 3, an electric power divider 4, an electric amplifier 5, an electric amplifier 6, an electric phase shifter 7, an electric phase shifter 8, a double polarization modulator 9, a photoelectric detector 10 and an electric phase shifter 11; wherein the dual polarization modulator 9 is composed of an optical power splitter 91, a single drive Mach-Zehnder modulator 92, a single drive Mach-Zehnder modulator 93, a 90 degree polarization rotator 94 and a polarization beam combiner 95; the concrete connection mode is as follows:
the output end of the continuous wave laser 1 is connected with the input end of the polarization controller 2, the output end of the polarization controller 2 is connected with the optical input end of the dual-polarization modulator 9, the output end of the radio frequency signal source 3 is connected with the input end of the electric power divider 4, the output end of the electric power divider 4 is respectively connected with the input end of the electric amplifier 5 and the input end of the electric amplifier 6, the output end of the electric amplifier 5 is connected with the input end of the electric phase shifter 7, the output end of the electric phase shifter 7 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 92, the output end of the electric phase shifter 8 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 93, the output end of the dual-polarization modulator 9 is connected with the input end of the photoelectric detector 10, the output end of the photoelectric detector 10 is connected with the input end of the electric phase shifter 11, and the output end of the electric phase shifter 11 is connected with the oscilloscope.
The continuous wave laser 1 and the polarization controller 2, the polarization controller 2 and the dual-polarization modulator 9, and the dual-polarization modulator 9 and the photoelectric detector 10 are all connected by adopting optical fibers. The radio frequency signal source 3 and the electric power divider 4, the electric power divider 4 and the electric amplifier 5, the electric power divider 4 and the electric amplifier 6, the electric amplifier 5 and the electric phase shifter 7, the electric amplifier 6 and the electric phase shifter 8, the electric phase shifter 7 and the single-drive Mach-Zehnder modulator 92, the electric phase shifter 8 and the single-drive Mach-Zehnder modulator 93, the photoelectric detector 10 and the electric phase shifter 11, and the electric phase shifter 11 and the oscilloscope are all connected by radio frequency wires.
The specific working principle of the invention is as follows:
the optical signal emitted by the continuous wave laser 1 enters the dual-polarization modulator 9 after passing through the polarization controller 2, and the polarization controller 2 is used for calibrating the polarization state of the optical signal, so that the polarization loss of the optical signal is reduced, and the modulation efficiency of the modulator is maximized. Let the optical field expression of the optical signal emitted by the continuous wave laser 1 be: e (E) in (t)＝E o exp(jω o t)，E o And omega o Representing the amplitude and angular frequency, respectively, of the optical signal. The electric field expression of the radio frequency signal sent by the radio frequency signal source 3 is：V RF (t)＝V RF sin(ωt),V RF And ω represents the amplitude and angular frequency, respectively, of the electrical signal. The single drive mach-zehnder modulator 92 is biased at the quadrature transmission point and the single drive mach-zehnder modulator 93 is biased at the minimum transmission point.
The optical field expressions of the optical signals output by the single-drive mach-zehnder modulator 92 and the single-drive mach-zehnder modulator 93 are respectively:
wherein m is 1 ＝ρ 1 πV RF /(2V π )and m 2 ＝ρ 2 πV RF /(2V π ) Representing the modulation factor of the single-drive mach-zehnder modulator 92 and the modulation factor of the single-drive mach-zehnder modulator 93, respectively. V (V) π Representing the half-wave voltage of the modulator. ρ 1 Representing the gain factor, ρ, of the electrical amplifier 5 2 Representing the gain factor of the electrical amplifier 6.θ 1 ，θ 2 ，θ 3 Representing the phase shift caused by the electric phase shifter 7, the electric phase shifter 8 and the electric phase shifter 11, respectively.
Since the optical signals output by the single-drive Mach-Zehnder modulator 92 and the single-drive Mach-Zehnder modulator 93 are input to the photodetector 10 in a manner orthogonal to each other, the beat frequency processes do not affect each other, and the expression of the electrical signals generated by each beat frequency in the photodetector 10 is
Wherein the method comprises the steps ofRepresenting the responsivity of the photodetector 10.
Consider small signal modulation:
the electrical signal output by the photodetector 10 can be expressed as
The expression of the electric signal output by the electric phase shifter 11 is
The fourier series expansion of a triangle waveform for an ideal different symmetry factor δ (symmetry factor being defined as the ratio of the time that the rising edge of the triangle waveform has elapsed to the period of the triangle waveform) can be expressed as:
T(t)＝DC+b n sin(nωt) (6)
DC represents a direct current term, and n is a positive integer.
B corresponding to different symmetry factors delta 1 ,b 2 ,b 3 The values are shown in the following table.
1. When theta is as 1 ＝0,θ 3 When=0
To generate a triangular waveform with a symmetry factor δ of 0%, the following needs to be satisfied:
from equation (8): m is m 1 ＝1.15，m 2 ＝0.83。
Triangular waveforms with symmetry factors of 10%,20% and 30% can also be generated under this condition, and m can be calculated similarly when δ=10% 1 ＝1.1，m 2 =0.81; when δ=20%, m 1 ＝0.92，m 2 =0.76; when δ=30%, m 1 ＝0.49，m 2 ＝0.53。
2. When (when)Time of day
Under the condition, triangular waveforms with symmetry factors of 40% can be generated, and the same calculation can be obtained: m is m 1 ＝0.61，m 2 ＝0.41。
3. When (when)θ 2 ＝0,m 2 When=0
A triangular waveform (symmetrical triangular waveform) with a symmetry factor of 50% can be generated under this condition. To generate a triangular waveform (symmetrical triangular waveform) with a nominal factor of 50%, the method needs to satisfy
The method can be characterized by comprising the following steps: when δ=50%, m 1 ＝0.76。
4. When (when)θ 2 ＝0,Time of day
A triangular waveform with a symmetry factor of 60% can be generated under this condition, and m can be calculated similarly when δ=60% 1 ＝0.61，m 2 ＝0.41。
5. When theta is as 1 ＝0,θ 3 When=0
Triangular waveforms with symmetry factors of 70%,80%,90% and 100% can be generated under this condition, and m can be calculated similarly when δ=70% 1 ＝0.49，m 2 =0.53; when δ=80%, m 1 ＝0.92，m 2 =0.76; when δ=90%, m 1 ＝1.1，m 2 =0.81; when δ=100%, m 1 ＝1.15，m 2 ＝0.83；
The invention has the beneficial effects that:
the invention realizes the generation of the triangular waveform with adjustable symmetric factors by using the dual-polarization modulator, and solves the problem that the symmetric factors of the scheme for generating the triangular waveform are not adjustable.
Drawings
Fig. 1 is a schematic diagram of a triangular waveform generator with adjustable symmetry factor based on a dual polarization modulator.
Fig. 2 is a time domain diagram of a triangular waveform with a symmetry factor of 0% output by the triangular waveform generator in the first embodiment.
Fig. 3 is a time domain diagram of a triangular waveform with a symmetry factor of 10% output by the triangular waveform generator in the second embodiment.
Fig. 4 is a time domain diagram of a triangular waveform with a symmetry factor of 20% output by the triangular waveform generator in the third embodiment.
Fig. 5 is a time domain diagram of a triangular waveform with a symmetry factor of 30% output from the triangular waveform generator in the fourth embodiment.
Fig. 6 is a time domain diagram of a triangular waveform with a symmetry factor of 40% output from the triangular waveform generator in the fifth embodiment.
Fig. 7 is a time domain diagram of a triangular waveform with a symmetry factor of 50% output from the triangular waveform generator in the sixth embodiment.
Fig. 8 is a time domain diagram of a triangular waveform with a symmetry factor of 80% output from the triangular waveform generator in the seventh embodiment.
Fig. 9 is a time domain diagram of a triangular waveform with 100% symmetry factor output by the triangular waveform generator in the eighth embodiment.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Embodiment one:
a dual polarization modulator-based triangular waveform generator with adjustable symmetry factors, characterized in that: the triangular waveform generator comprises a continuous wave laser 1, a polarization controller 2, a radio frequency signal source 3, an electric power divider 4, an electric amplifier 5, an electric amplifier 6, an electric phase shifter 7, an electric phase shifter 8, a double polarization modulator 9, a photoelectric detector 10 and an electric phase shifter 11; wherein the dual polarization modulator 9 is composed of an optical power splitter 91, a single drive Mach-Zehnder modulator 92, a single drive Mach-Zehnder modulator 93, a 90 degree polarization rotator 94 and a polarization beam combiner 95; the concrete connection mode is as follows:
the output end of the continuous wave laser 1 is connected with the input end of the polarization controller 2, the output end of the polarization controller 2 is connected with the optical input end of the dual-polarization modulator 9, the output end of the radio frequency signal source 3 is connected with the input end of the electric power divider 4, the output end of the electric power divider 4 is respectively connected with the input end of the electric amplifier 5 and the input end of the electric amplifier 6, the output end of the electric amplifier 5 is connected with the input end of the electric phase shifter 7, the output end of the electric phase shifter 7 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 92, the output end of the electric phase shifter 8 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 93, the output end of the dual-polarization modulator 9 is connected with the input end of the photoelectric detector 10, the output end of the photoelectric detector 10 is connected with the input end of the electric phase shifter 11, and the output end of the electric phase shifter 11 is connected with the oscilloscope.
The single drive mach-zehnder modulator 92 is biased at the quadrature transmission point and the single drive mach-zehnder modulator 93 is biased at the minimum transmission point.
The insertion loss, half-wave voltage and extinction ratio of the modulators (92 and 93) were 5dB,4v and 30dB, respectively. The power, wavelength and linewidth of the continuous wave laser 1 were 15dbm,1550.12nm and 10MHz, respectively. The responsivity, dark current and thermal power density of the photodetector 10 were 1A/W,10nA and 10 respectively -21 W/Hz. By adjusting the electrical amplifier 5 such that the modulation factor of the single drive mach-zehnder modulator 92 is 1.15,the electric amplifier 6 is adjusted so that the modulation factor of the single drive mach-zehnder modulator 93 is 0.83. The phase shifts of the electric phase shifter 7, the electric phase shifter 8 and the electric phase shifter 11 are adjusted to 0,0. the frequency of the radio frequency signal source 3 is 5GHz. A time domain plot of the output signal of the electrical phase shifter 11 is shown in fig. 2.
Embodiment two:
a dual polarization modulator-based triangular waveform generator with adjustable symmetry factors, characterized in that: the triangular waveform generator comprises a continuous wave laser 1, a polarization controller 2, a radio frequency signal source 3, an electric power divider 4, an electric amplifier 5, an electric amplifier 6, an electric phase shifter 7, an electric phase shifter 8, a double polarization modulator 9, a photoelectric detector 10 and an electric phase shifter 11; wherein the dual polarization modulator 9 is composed of an optical power splitter 91, a single drive Mach-Zehnder modulator 92, a single drive Mach-Zehnder modulator 93, a 90 degree polarization rotator 94 and a polarization beam combiner 95; the concrete connection mode is as follows:
the output end of the continuous wave laser 1 is connected with the input end of the polarization controller 2, the output end of the polarization controller 2 is connected with the optical input end of the dual-polarization modulator 9, the output end of the radio frequency signal source 3 is connected with the input end of the electric power divider 4, the output end of the electric power divider 4 is respectively connected with the input end of the electric amplifier 5 and the input end of the electric amplifier 6, the output end of the electric amplifier 5 is connected with the input end of the electric phase shifter 7, the output end of the electric phase shifter 7 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 92, the output end of the electric phase shifter 8 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 93, the output end of the dual-polarization modulator 9 is connected with the input end of the photoelectric detector 10, the output end of the photoelectric detector 10 is connected with the input end of the electric phase shifter 11, and the output end of the electric phase shifter 11 is connected with the oscilloscope.
The single drive mach-zehnder modulator 92 is biased at the quadrature transmission point and the single drive mach-zehnder modulator 93 is biased at the minimum transmission point.
The insertion loss, half-wave voltage and extinction ratio of the modulators (92 and 93) were 5dB,4v and 30dB, respectively. Continuous and continuousThe power, wavelength and linewidth of the wave laser 1 were 15dbm,1550.12nm and 10MHz, respectively. The responsivity, dark current and thermal power density of the photodetector 10 were 1A/W,10nA and 10 respectively -21 W/Hz. The electric amplifier 6 is adjusted so that the modulation factor of the single-drive mach-zehnder modulator 93 is 0.81 by adjusting the electric amplifier 5 so that the modulation factor of the single-drive mach-zehnder modulator 92 is 1.1. The phase shifts of the electric phase shifter 7, the electric phase shifter 8 and the electric phase shifter 11 are adjusted to 0,0. the frequency of the radio frequency signal source 3 is 5GHz. A time domain plot of the output signal of the electrical phase shifter 11 is shown in fig. 3.
Embodiment III:
a dual polarization modulator-based triangular waveform generator with adjustable symmetry factors, characterized in that: the triangular waveform generator comprises a continuous wave laser 1, a polarization controller 2, a radio frequency signal source 3, an electric power divider 4, an electric amplifier 5, an electric amplifier 6, an electric phase shifter 7, an electric phase shifter 8, a double polarization modulator 9, a photoelectric detector 10 and an electric phase shifter 11; wherein the dual polarization modulator 9 is composed of an optical power splitter 91, a single drive Mach-Zehnder modulator 92, a single drive Mach-Zehnder modulator 93, a 90 degree polarization rotator 94 and a polarization beam combiner 95; the concrete connection mode is as follows:
the output end of the continuous wave laser 1 is connected with the input end of the polarization controller 2, the output end of the polarization controller 2 is connected with the optical input end of the dual-polarization modulator 9, the output end of the radio frequency signal source 3 is connected with the input end of the electric power divider 4, the output end of the electric power divider 4 is respectively connected with the input end of the electric amplifier 5 and the input end of the electric amplifier 6, the output end of the electric amplifier 5 is connected with the input end of the electric phase shifter 7, the output end of the electric phase shifter 7 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 92, the output end of the electric phase shifter 8 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 93, the output end of the dual-polarization modulator 9 is connected with the input end of the photoelectric detector 10, the output end of the photoelectric detector 10 is connected with the input end of the electric phase shifter 11, and the output end of the electric phase shifter 11 is connected with the oscilloscope.
The single drive mach-zehnder modulator 92 is biased at the quadrature transmission point and the single drive mach-zehnder modulator 93 is biased at the minimum transmission point.
The insertion loss, half-wave voltage and extinction ratio of the modulators (92 and 93) were 5dB,4v and 30dB, respectively. The power, wavelength and linewidth of the continuous wave laser 1 were 15dbm,1550.12nm and 10MHz, respectively. The responsivity, dark current and thermal power density of the photodetector 10 were 1A/W,10nA and 10 respectively -21 W/Hz. The electric amplifier 6 is adjusted so that the modulation factor of the single-drive mach-zehnder modulator 93 is 0.76 by adjusting the electric amplifier 5 so that the modulation factor of the single-drive mach-zehnder modulator 92 is 0.92. The phase shifts of the electric phase shifter 7, the electric phase shifter 8 and the electric phase shifter 11 are adjusted to 0,0. the frequency of the radio frequency signal source 3 is 5GHz. A time domain plot of the output signal of the electrical phase shifter 11 is shown in fig. 4.
Embodiment four:
a dual polarization modulator-based triangular waveform generator with adjustable symmetry factors, characterized in that: the triangular waveform generator comprises a continuous wave laser 1, a polarization controller 2, a radio frequency signal source 3, an electric power divider 4, an electric amplifier 5, an electric amplifier 6, an electric phase shifter 7, an electric phase shifter 8, a double polarization modulator 9, a photoelectric detector 10 and an electric phase shifter 11; wherein the dual polarization modulator 9 is composed of an optical power splitter 91, a single drive Mach-Zehnder modulator 92, a single drive Mach-Zehnder modulator 93, a 90 degree polarization rotator 94 and a polarization beam combiner 95; the concrete connection mode is as follows:
the output end of the continuous wave laser 1 is connected with the input end of the polarization controller 2, the output end of the polarization controller 2 is connected with the optical input end of the dual-polarization modulator 9, the output end of the radio frequency signal source 3 is connected with the input end of the electric power divider 4, the output end of the electric power divider 4 is respectively connected with the input end of the electric amplifier 5 and the input end of the electric amplifier 6, the output end of the electric amplifier 5 is connected with the input end of the electric phase shifter 7, the output end of the electric phase shifter 7 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 92, the output end of the electric phase shifter 8 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 93, the output end of the dual-polarization modulator 9 is connected with the input end of the photoelectric detector 10, the output end of the photoelectric detector 10 is connected with the input end of the electric phase shifter 11, and the output end of the electric phase shifter 11 is connected with the oscilloscope.
The single drive mach-zehnder modulator 92 is biased at the quadrature transmission point and the single drive mach-zehnder modulator 93 is biased at the minimum transmission point.
The insertion loss, half-wave voltage and extinction ratio of the modulators (92 and 93) were 5dB,4v and 30dB, respectively. The power, wavelength and linewidth of the continuous wave laser 1 were 15dbm,1550.12nm and 10MHz, respectively. The responsivity, dark current and thermal power density of the photodetector 10 were 1A/W,10nA and 10 respectively -21 W/Hz. The electric amplifier 6 is adjusted so that the modulation factor of the single-drive mach-zehnder modulator 93 is 0.53 by adjusting the electric amplifier 5 so that the modulation factor of the single-drive mach-zehnder modulator 92 is 0.49. The phase shifts of the electric phase shifter 7, the electric phase shifter 8 and the electric phase shifter 11 are adjusted to 0,0. the frequency of the radio frequency signal source 3 is 5GHz. A time domain plot of the output signal of the electrical phase shifter 11 is shown in fig. 5.
Fifth embodiment:
a dual polarization modulator-based triangular waveform generator with adjustable symmetry factors, characterized in that: the triangular waveform generator comprises a continuous wave laser 1, a polarization controller 2, a radio frequency signal source 3, an electric power divider 4, an electric amplifier 5, an electric amplifier 6, an electric phase shifter 7, an electric phase shifter 8, a double polarization modulator 9, a photoelectric detector 10 and an electric phase shifter 11; wherein the dual polarization modulator 9 is composed of an optical power splitter 91, a single drive Mach-Zehnder modulator 92, a single drive Mach-Zehnder modulator 93, a 90 degree polarization rotator 94 and a polarization beam combiner 95; the concrete connection mode is as follows:
the output end of the continuous wave laser 1 is connected with the input end of the polarization controller 2, the output end of the polarization controller 2 is connected with the optical input end of the dual-polarization modulator 9, the output end of the radio frequency signal source 3 is connected with the input end of the electric power divider 4, the output end of the electric power divider 4 is respectively connected with the input end of the electric amplifier 5 and the input end of the electric amplifier 6, the output end of the electric amplifier 5 is connected with the input end of the electric phase shifter 7, the output end of the electric phase shifter 7 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 92, the output end of the electric phase shifter 8 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 93, the output end of the dual-polarization modulator 9 is connected with the input end of the photoelectric detector 10, the output end of the photoelectric detector 10 is connected with the input end of the electric phase shifter 11, and the output end of the electric phase shifter 11 is connected with the oscilloscope.
The single drive mach-zehnder modulator 92 is biased at the quadrature transmission point and the single drive mach-zehnder modulator 93 is biased at the minimum transmission point.
The insertion loss, half-wave voltage and extinction ratio of the modulators (92 and 93) were 5dB,4v and 30dB, respectively. The power, wavelength and linewidth of the continuous wave laser 1 were 15dbm,1550.12nm and 10MHz, respectively. The responsivity, dark current and thermal power density of the photodetector 10 were 1A/W,10nA and 10 respectively -21 W/Hz. The electric amplifier 6 is adjusted so that the modulation factor of the single-drive mach-zehnder modulator 93 is 0.41 by adjusting the electric amplifier 5 so that the modulation factor of the single-drive mach-zehnder modulator 92 is 0.61. The phase shifts of the electric phase shifter 7, the electric phase shifter 8 and the electric phase shifter 11 are respectively adjusted to beThe frequency of the radio frequency signal source 3 is 5GHz. A time domain plot of the output signal of the electrical phase shifter 11 is shown in fig. 6.
Example six:
a dual polarization modulator-based triangular waveform generator with adjustable symmetry factors, characterized in that: the triangular waveform generator comprises a continuous wave laser 1, a polarization controller 2, a radio frequency signal source 3, an electric power divider 4, an electric amplifier 5, an electric amplifier 6, an electric phase shifter 7, an electric phase shifter 8, a double polarization modulator 9, a photoelectric detector 10 and an electric phase shifter 11; wherein the dual polarization modulator 9 is composed of an optical power splitter 91, a single drive Mach-Zehnder modulator 92, a single drive Mach-Zehnder modulator 93, a 90 degree polarization rotator 94 and a polarization beam combiner 95; the concrete connection mode is as follows:
the output end of the continuous wave laser 1 is connected with the input end of the polarization controller 2, the output end of the polarization controller 2 is connected with the optical input end of the dual-polarization modulator 9, the output end of the radio frequency signal source 3 is connected with the input end of the electric power divider 4, the output end of the electric power divider 4 is respectively connected with the input end of the electric amplifier 5 and the input end of the electric amplifier 6, the output end of the electric amplifier 5 is connected with the input end of the electric phase shifter 7, the output end of the electric phase shifter 7 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 92, the output end of the electric phase shifter 8 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 93, the output end of the dual-polarization modulator 9 is connected with the input end of the photoelectric detector 10, the output end of the photoelectric detector 10 is connected with the input end of the electric phase shifter 11, and the output end of the electric phase shifter 11 is connected with the oscilloscope.
The single drive mach-zehnder modulator 92 is biased at the quadrature transmission point and the single drive mach-zehnder modulator 93 is biased at the minimum transmission point.
The insertion loss, half-wave voltage and extinction ratio of the modulators (92 and 93) were 5dB,4v and 30dB, respectively. The power, wavelength and linewidth of the continuous wave laser 1 were 15dbm,1550.12nm and 10MHz, respectively. The responsivity, dark current and thermal power density of the photodetector 10 were 1A/W,10nA and 10 respectively -21 W/Hz. The modulation factor of the single-drive mach-zehnder modulator 92 is made 0.76 by adjusting the electric amplifier 5, and the modulation factor of the single-drive mach-zehnder modulator 93 is made 0 by not loading the radio frequency signal on the single-drive mach-zehnder modulator 93. The phase shifts of the electric phase shifter 7, the electric phase shifter 8 and the electric phase shifter 11 are respectively adjusted to be0，The frequency of the radio frequency signal source 3 is 5GHz. A time domain plot of the output signal of the electrical phase shifter 11 is shown in fig. 7.
Embodiment seven:
a dual polarization modulator-based triangular waveform generator with adjustable symmetry factors, characterized in that: the triangular waveform generator comprises a continuous wave laser 1, a polarization controller 2, a radio frequency signal source 3, an electric power divider 4, an electric amplifier 5, an electric amplifier 6, an electric phase shifter 7, an electric phase shifter 8, a double polarization modulator 9, a photoelectric detector 10 and an electric phase shifter 11; wherein the dual polarization modulator 9 is composed of an optical power splitter 91, a single drive Mach-Zehnder modulator 92, a single drive Mach-Zehnder modulator 93, a 90 degree polarization rotator 94 and a polarization beam combiner 95; the concrete connection mode is as follows:
the output end of the continuous wave laser 1 is connected with the input end of the polarization controller 2, the output end of the polarization controller 2 is connected with the optical input end of the dual-polarization modulator 9, the output end of the radio frequency signal source 3 is connected with the input end of the electric power divider 4, the output end of the electric power divider 4 is respectively connected with the input end of the electric amplifier 5 and the input end of the electric amplifier 6, the output end of the electric amplifier 5 is connected with the input end of the electric phase shifter 7, the output end of the electric phase shifter 7 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 92, the output end of the electric phase shifter 8 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 93, the output end of the dual-polarization modulator 9 is connected with the input end of the photoelectric detector 10, the output end of the photoelectric detector 10 is connected with the input end of the electric phase shifter 11, and the output end of the electric phase shifter 11 is connected with the oscilloscope.
The single drive mach-zehnder modulator 92 is biased at the quadrature transmission point and the single drive mach-zehnder modulator 93 is biased at the minimum transmission point.
The insertion loss, half-wave voltage and extinction ratio of the modulators (92 and 93) were 5dB,4v and 30dB, respectively. The power, wavelength and linewidth of the continuous wave laser 1 were 15dbm,1550.12nm and 10MHz, respectively. The responsivity, dark current and thermal power density of the photodetector 10 were 1A/W,10nA and 10 respectively -21 W/Hz. The electric amplifier 6 is adjusted so that the modulation factor of the single-drive mach-zehnder modulator 93 is 0.76 by adjusting the electric amplifier 5 so that the modulation factor of the single-drive mach-zehnder modulator 92 is 0.92. The phase shifts of the electric phase shifter 7, the electric phase shifter 8 and the electric phase shifter 11 are adjusted to 0,0. the frequency of the radio frequency signal source 3 is 5GHz. A time domain plot of the output signal of the electrical phase shifter 11 is shown in fig. 8.
Example eight:
a dual polarization modulator-based triangular waveform generator with adjustable symmetry factors, characterized in that: the triangular waveform generator comprises a continuous wave laser 1, a polarization controller 2, a radio frequency signal source 3, an electric power divider 4, an electric amplifier 5, an electric amplifier 6, an electric phase shifter 7, an electric phase shifter 8, a double polarization modulator 9, a photoelectric detector 10 and an electric phase shifter 11; wherein the dual polarization modulator 9 is composed of an optical power splitter 91, a single drive Mach-Zehnder modulator 92, a single drive Mach-Zehnder modulator 93, a 90 degree polarization rotator 94 and a polarization beam combiner 95; the concrete connection mode is as follows:
the output end of the continuous wave laser 1 is connected with the input end of the polarization controller 2, the output end of the polarization controller 2 is connected with the optical input end of the dual-polarization modulator 9, the output end of the radio frequency signal source 3 is connected with the input end of the electric power divider 4, the output end of the electric power divider 4 is respectively connected with the input end of the electric amplifier 5 and the input end of the electric amplifier 6, the output end of the electric amplifier 5 is connected with the input end of the electric phase shifter 7, the output end of the electric phase shifter 7 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 92, the output end of the electric phase shifter 8 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 93, the output end of the dual-polarization modulator 9 is connected with the input end of the photoelectric detector 10, the output end of the photoelectric detector 10 is connected with the input end of the electric phase shifter 11, and the output end of the electric phase shifter 11 is connected with the oscilloscope.
The single drive mach-zehnder modulator 92 is biased at the quadrature transmission point and the single drive mach-zehnder modulator 93 is biased at the minimum transmission point.
The insertion loss, half-wave voltage and extinction ratio of the modulators (92 and 93) were 5dB,4v and 30dB, respectively. The power, wavelength and linewidth of the continuous wave laser 1 were 15dbm,1550.12nm and 10MHz, respectively. The responsivity, dark current and thermal power density of the photodetector 10 were 1A/W,10nA and 10 respectively -21 W/Hz. Modulation of the single drive Mach-Zehnder modulator 92 by adjusting the electrical amplifier 5The coefficient is 1.15, and the electric amplifier 6 is adjusted so that the modulation coefficient of the single drive mach-zehnder modulator 93 is 0.83. The phase shifts of the electric phase shifter 7, the electric phase shifter 8 and the electric phase shifter 11 are adjusted to 0,0. the frequency of the radio frequency signal source 3 is 5GHz. A time domain plot of the output signal of the electrical phase shifter 11 is shown in fig. 9. />
Claims (2)
1. A dual polarization modulator-based triangular waveform generator with adjustable symmetry factors, characterized in that: the triangular waveform generator comprises a continuous wave laser 1, a polarization controller 2, a radio frequency signal source 3, an electric power divider 4, an electric amplifier 5, an electric amplifier 6, an electric phase shifter 7, an electric phase shifter 8, a double polarization modulator 9, a photoelectric detector 10 and an electric phase shifter 11; wherein the dual polarization modulator 9 is composed of an optical power splitter 91, a single drive Mach-Zehnder modulator 92, a single drive Mach-Zehnder modulator 93, a 90 degree polarization rotator 94 and a polarization beam combiner 95; the concrete connection mode is as follows:
the output end of the continuous wave laser 1 is connected with the input end of the polarization controller 2, the output end of the polarization controller 2 is connected with the optical input end of the dual-polarization modulator 9, the output end of the radio frequency signal source 3 is connected with the input end of the electric power divider 4, the output end of the electric power divider 4 is respectively connected with the input end of the electric amplifier 5 and the input end of the electric amplifier 6, the output end of the electric amplifier 5 is connected with the input end of the electric phase shifter 7, the output end of the electric amplifier 6 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 92, the output end of the electric phase shifter 8 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 93, the output end of the dual-polarization modulator 9 is connected with the input end of the photoelectric detector 10, the output end of the photoelectric detector 10 is connected with the input end of the electric phase shifter 11, and the output end of the electric phase shifter 11 is connected with the oscilloscope;
by properly adjusting the gain of the electric amplifier 5, the gain of the electric amplifier 6, the phase shift of the electric phase shifter 7, the phase shift of the electric phase shifter 8, and the phase shift of the electric phase shifter 11, a triangular waveform with a symmetry factor of 0% -100% can be generated, and the symmetry factor is defined as the ratio of the time elapsed by the rising edge of the triangular waveform to the period of the triangular waveform.
2. A dual polarization modulator based symmetry factor adjustable triangular waveform generator according to claim 1, wherein: the single drive mach-zehnder modulator 92 is biased at the quadrature transmission point and the single drive mach-zehnder modulator 93 is biased at the minimum transmission point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010757339.1A CN114070409B (en) | 2020-07-31 | 2020-07-31 | Triangular waveform generator with adjustable symmetry factor based on dual polarization modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010757339.1A CN114070409B (en) | 2020-07-31 | 2020-07-31 | Triangular waveform generator with adjustable symmetry factor based on dual polarization modulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114070409A CN114070409A (en) | 2022-02-18 |
| CN114070409B true CN114070409B (en) | 2024-02-06 |
Family
ID=80227472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010757339.1A Active CN114070409B (en) | 2020-07-31 | 2020-07-31 | Triangular waveform generator with adjustable symmetry factor based on dual polarization modulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114070409B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427347A (en) * | 2011-09-30 | 2012-04-25 | 中国兵器工业集团第二一四研究所苏州研发中心 | Truncated triangular wave generating circuit |
| CN106301586A (en) * | 2015-05-12 | 2017-01-04 | 北京交通大学 | A kind of optical triangulation shape pulse generator with tunable repetition rate |
| CN106877938A (en) * | 2017-01-24 | 2017-06-20 | 西安电子科技大学 | The device and method of full photogenerated frequency multiplication triangular wave |
| CN108574536A (en) * | 2018-03-20 | 2018-09-25 | 西安电子科技大学 | Triangular wave generating means and method based on cross-polarization modulation |
| CN208079086U (en) * | 2018-01-04 | 2018-11-09 | 北京交通大学 | Quadruple optics triangle generator based on external modulation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2390072C (en) * | 2002-06-28 | 2018-02-27 | Adrian Gh Podoleanu | Optical mapping apparatus with adjustable depth resolution and multiple functionality |
| US8849129B2 (en) * | 2012-07-20 | 2014-09-30 | Finisar Corporation | Method and apparatus for stabilization of optical transmitter |
-
2020
- 2020-07-31 CN CN202010757339.1A patent/CN114070409B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427347A (en) * | 2011-09-30 | 2012-04-25 | 中国兵器工业集团第二一四研究所苏州研发中心 | Truncated triangular wave generating circuit |
| CN106301586A (en) * | 2015-05-12 | 2017-01-04 | 北京交通大学 | A kind of optical triangulation shape pulse generator with tunable repetition rate |
| CN106877938A (en) * | 2017-01-24 | 2017-06-20 | 西安电子科技大学 | The device and method of full photogenerated frequency multiplication triangular wave |
| CN208079086U (en) * | 2018-01-04 | 2018-11-09 | 北京交通大学 | Quadruple optics triangle generator based on external modulation |
| CN108574536A (en) * | 2018-03-20 | 2018-09-25 | 西安电子科技大学 | Triangular wave generating means and method based on cross-polarization modulation |
Non-Patent Citations (3)
| Title |
|---|
| Photonic Generation and Transmission of Frequency-Doubled Triangular and Square Waveforms Based on Two Mach–Zehnder Modulators and a Sagnac Loop;Weile Zhai;《JOURNAL OF LIGHTWAVE TECHNOLOGY》;全文 * |
| 基于微波光子学的倍频三角波生成方法;王天亮 等;《激光技术》;全文 * |
| 面向全光信号处理的三角形光脉冲产生技术;袁瑾 等;《光电技术应用》;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114070409A (en) | 2022-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Chan et al. | Photonic RF phase shifter based on optical carrier and RF modulation sidebands amplitude and phase control | |
| Williamson et al. | RF photonics | |
| CN110212987B (en) | Radio frequency linear frequency modulation signal generation method and device based on frequency spectrum splicing | |
| CN112152720B (en) | Multi-frequency-band double-chirp microwave signal generation and optical fiber dispersion resistant transmission system and method | |
| CN102183303B (en) | Comb spectrum generating system and method based on circulating frequency shift mode | |
| CN108988105A (en) | A kind of generation device and its method of the super flat microwave frequency comb in high power broadband | |
| EP2409430B1 (en) | Optical single-sideband transmitter | |
| Li et al. | All-optical photonic microwave phase shifter requiring only a single DC voltage control | |
| CN104330940A (en) | Device for generating Nyquist optical pulse based on ultra-broadband optical frequency comb | |
| Wu et al. | Photonic microwave waveforms generation based on frequency and time-domain synthesis | |
| CN114050873A (en) | Remote microwave frequency measuring device and method based on dispersion compensation technology | |
| CN114124231B (en) | Parallel multi-band multi-lattice microwave signal generator | |
| CN114070409B (en) | Triangular waveform generator with adjustable symmetry factor based on dual polarization modulator | |
| Li et al. | Photonic generation of frequency-doubled microwave waveform based on a PDM-MZM modulator | |
| CN113972953B (en) | Triangular waveform generator based on two single-drive Mach-Zehnder modulators | |
| Xia et al. | Photonic microwave waveforms generation based on pulse carving and superposition in time-domain | |
| CN114614903B (en) | Photon signal generator and generation method | |
| Yang et al. | Symmetry-tunable full-duty triangular-shaped waveform generation using a simple single-drive Mach-Zehnder modulator | |
| Zhang et al. | Highly reconfigurable microwave photonic waveform generation based on time-wavelength interleaving | |
| CN113541813B (en) | Quadruple frequency triangular wave generator based on DP-QPSK modulator | |
| Song et al. | A chirp-rate-tunable microwave photonic pulse compression system for multi-octave linearly chirped microwave waveform | |
| CN113810123B (en) | Arbitrary waveform generator based on DP-QPSK modulator | |
| CN111180992A (en) | Frequency tunable microwave signal generation device and method under low phase noise | |
| Li et al. | Photonic generation of frequency-doubled triangular-shaped waveforms based on a PM-MZM modulator | |
| CN115268118B (en) | Optical frequency comb generating system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |