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Microwave Photonics
Optical pulse repetition rate division using an optoelectronic oscillator
Ping Li
Kunlin Shao
Yamei Zhang
*
Shilong Pan
Author Affiliations
Abstract
National Key Laboratory of
Microwave Photonics
, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
An approach for frequency division of an optical pulse train (OPT) based on an optoelectronic oscillator (OEO) is proposed and experimentally demonstrated. When the OPT is injected into the OEO, a microwave signal with a frequency equaling fractional multiples of the repetition rate of the OPT is generated. This signal is then fed back to the OEO, maintaining its oscillation, while simultaneously serving as the control signal of a Mach–Zehnder modulator (MZM) in the OEO. The MZM acts as an optical switch, permitting specific pulses to pass through while blocking others. As a result, the repetition rate of the OPT is manipulated. A proof-of-concept experiment is carried out. Frequency division factors of 2 and 3 are successfully achieved. The phase noises of the OPT before and after the frequency division are investigated. Compared to previously reported systems, no external microwave source and sophisticated synchronization structure are needed.
frequency division
optoelectronic oscillator
mode-locked laser
microwave photonics
PDF全文
Full Text
Chinese Optics Letters
2024, 22(4): 043902
Microwave Photonics
Demonstration of radar-aided flexible communication in a photonics-based W-band distributed integrated sensing and communication system for 6G
Junlian Jia
1,2
Boyu Dong
1,2
Li Tao
3
Jianyang Shi
1,2
[ ... ]
Junwen Zhang
2,*
Author Affiliations
Abstract
1
Key Laboratory of EMW Information (MoE), Fudan University, Shanghai 200433, China
2
Shanghai ERC of LEO Satellite Communication and Applications, Shanghai CIC of LEO Satellite Communication Technology, Shanghai 200433, China
3
Science and Technology on Electromagnetic Compatibility Laboratory, China Ship Development and Design Centre, Wuhan 430000, China
4
Peng Cheng Laboratory, Shenzhen 518055, China
This paper experimentally demonstrates a distributed photonics-based W-band integrated sensing and communication (ISAC) system, in which radar sensing can aid the communication links in alignment and data rate estimation. As a proof-of-concept, the ISAC system locates the users, guides the alignment, and sets a communication link with the estimated highest data rate. A peak net data rate of 68.6 Gbit/s and a target sensing with a less-than-1-cm error and a sub-2-cm resolution have been tested over a 10-km fiber and a 1.15-m free space transmission in the photonics-based W-band ISAC system. The achievable net data rates of the users at different locations estimated by sensing are experimentally verified.
integrated sensing and communication
photonics-aided technique
W-band
radar-aided flexible communication
PDF全文
Full Text
Chinese Optics Letters
2024, 22(4): 043901
Microwave Photonics
Highly efficient conversion from classical guided waves to topological chiral edge states
Jianfei Han
1
Feng Liang
1,*
Yulin Zhao
1
Xiao Ding
1
[ ... ]
Bing-Zhong Wang
1
Author Affiliations
Abstract
1
School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China
2
School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Electromagnetic topological chiral edge states mimicking the quantum Hall effect have attracted a great deal of attention due to their unique features of free backscattering and immunity against sharp bends and defects. However, the matching techniques between classical waveguides and the topological one-way waveguide deserve more attention for real-world applications. In this paper, a highly efficient conversion structure between a classical rectangular waveguide and a topological one-way waveguide is proposed and demonstrated at the microwave frequency, which efficiently converts classical guided waves to topological one-way edge states. A tapered transition is designed to match both the momentum and impedance of the classical guided waves and the topological one-way edge states. With the conversion structure, the waves generated by a point excitation source can be coupled to the topological one-way waveguide with very high coupling efficiency, which can ensure high transmission of the whole system (i.e., from the source and the receiver). Simulation and measurement results demonstrate the proposed method. This investigation is beneficial to the applications of topological one-way waveguides and opens up a new avenue for advanced topological and classical integrated functional devices and systems.
guided waves
highly efficient conversion
photonic crystals
topological chiral edge states
PDF全文
Full Text
Chinese Optics Letters
2024, 22(2): 023902
Microwave Photonics
Programmable photonic RF filters based on an integrated Fabry–Pérot laser with a saturable absorber
Zhenzhen Xu
Yitong Liu
Jiahui Liu
Ling Wang
[ ... ]
Xiangfei Chen
*
Author Affiliations
Abstract
Key Laboratory of Intelligent Optical Sensing and Manipulation of the Ministry of Education & National Laboratory of Solid State Microstructures & College of Engineering and Applied Sciences & Institute of Optical Communication Engineering & Nanjing University-Tongding Joint Lab for Large-Scale Photonic Integrated Circuits, Nanjing University, Nanjing 210023, China
We propose and experimentally demonstrate the programmable photonic radio frequency (RF) filters based on an integrated Fabry–Pérot laser with a saturable absorber (FP-SA). Owing to the high output power and the relative flatness spectrum of the FP-SA laser, only a waveshaper and an erbium-doped fiber amplifier (EDFA) were needed, which can greatly reduce the complexity of the system. The sinc filter employed 87 taps, representing a record-high tap number and resulting in a 3-dB bandwidth of 0.27 GHz and a quality factor of 148. Furthermore, Gaussian apodization enabled the out-of-band rejection of the filter to reach 34 dB and the center frequency to be finely tuned over a wide range, spanning from 4 to 14 GHz. These results indicate that the proposed scheme could provide a promising guideline for the photonic RF filters that demand both high reconfigurability and greatly reduced size and complexity.
microwave filters
microwave photonics
passively mode-locked laser
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Full Text
Chinese Optics Letters
2024, 22(2): 023901
Microwave Photonics
Long-term ultrastable frequency dissemination via a 50-km spooled fiber link using a two-section DFB laser
Zhiqian Yin
1
Chuanbo Zhang
1
Shijian Guan
1
Xin Zhou
1
[ ... ]
Xiangfei Chen
1,**
Author Affiliations
Abstract
1
Engineering Research Center of Precision Photonics Integration and System Application, Ministry of Education & Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education & National Laboratory of Solid State Microstructures & College of Engineering and Applied Sciences & Institute of Optical Communication Engineering & Nanjing University-Tongding Joint Lab for Large-Scale Photonic Integrated Circuits, Nanjing University, Nanjing 210023, China
2
College of Electronics and Optical Engineering and College of Flexible Electronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
3
The 41st Research Institute of China Electronics Technology Group Corp, Qingdao 266000, China
The stable long-distance transmission of radio-frequency (RF) signals holds significant importance from various aspects, including the comparison of optical frequency standards, remote monitoring and control, scientific research and experiments, and RF spectrum management. We demonstrate a scheme where an ultrastable frequency signal was transmitted over a 50 km coiled fiber. The optical RF signal is generated using a two-section distributed feedback (DFB) laser for direct modulation based on the reconstruction equivalent chirp (REC) technique. The 3-dB modulation bandwidth of the two-section DFB laser is 18 GHz and the residual phase noise of
-
122.87
dBc
/
Hz
is achieved at 10-Hz offset frequency. We report a short-term stability of
1.62
×
10
-
14
at an average time of 1 s and a long-term stability of
6.55
×
10
-
18
at the measurement time of 62,000 s when applying current to the front section of the DFB laser. By applying power to both sections, the stability of the system improves to
4.42
×
10
-
18
within a testing period of 56,737 s. Despite applying temperature variations to the transmission link, long-term stability of
8.63
×
10
-
18
at 23.9 h can still be achieved.
frequency dissemination
two-section DFB laser
phase stability
PDF全文
Full Text
Chinese Optics Letters
2024, 22(1): 013903
Microwave Photonics
Time-resolution enhanced multi-path OTD measurement using an adaptive filter based incoherent OFDR
Lihan Wang
Lingyun Ren
Xiangchuan Wang
*
Shilong Pan
**
Author Affiliations
Abstract
National Key Laboratory of
Microwave Photonics
, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
High accuracy and time resolution optical transfer delay (OTD) measurement is highly desired in many multi-path applications, such as optical true-time-delay-based array systems and distributed optical sensors. However, the time resolution is usually limited by the frequency range of the probe signal in frequency-multiplexed OTD measurement techniques. Here, we proposed a time-resolution enhanced OTD measurement method based on incoherent optical frequency domain reflectometry (I-OFDR), where an adaptive filter is designed to suppress the spectral leakage from other paths to break the resolution limitation. A weighted least square (WLS) cost function is first established, and then an iteration approach is used to minimize the cost function. Finally, the appropriate filter parameter is obtained according to the convergence results. In a proof-of-concept experiment, the time-domain response of two optical links with a length difference of 900 ps is successfully estimated by applying a probe signal with a bandwidth of 400 MHz. The time resolution is improved by 2.78 times compared to the theoretical resolution limit of the inverse discrete Fourier transform (iDFT) algorithm. In addition, the OTD measurement error is below
±
0.8
ps
. The proposed algorithm provides a novel way to improve the measurement resolution without applying a probe signal with a large bandwidth, avoiding measurement errors induced by the dispersion effect.
optical transfer delay measurement
time resolution enhancement
incoherent OFDR
adaptive filtering
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Full Text
Chinese Optics Letters
2024, 22(1): 013901
Microwave Photonics
Sub-Nyquist radar receiver based on photonics-assisted compressed sensing and cascaded dictionaries
Shiyang Liu
1,2
Yang Chen
1,2,*
Author Affiliations
Abstract
1
Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai 200241, China
2
Engineering Center of SHMEC for Space Information and GNSS, East China Normal University, Shanghai 200241, China
A sub-Nyquist radar receiver based on photonics-assisted compressed sensing is proposed. Cascaded dictionaries are applied to extract the delay and the Doppler frequency of the echo signals, which do not need to accumulate multiple echo periods and can achieve better Doppler accuracy. An experiment is performed. Radar echoes with different delays and Doppler frequencies are undersampled and successfully reconstructed to obtain the delay and Doppler information of the targets. Experimental results show that the average reconstruction error of the Doppler frequency is 5.33 kHz using an 8-μs radar signal under the compression ratio of 5. The proposed method provides a promising solution for the sub-Nyquist radar receiver.
compressed sensing
dictionary learning
sub-Nyquist radar
microwave photonics
Doppler frequency
PDF全文
Full Text
Chinese Optics Letters
2024, 22(1): 013902
Microwave Photonics
Photonics 60 GBaud PDM-16QAM fiber-wireless 2 × 2 MIMO delivery at THz-band
Weiping Li
1
Jianjun Yu
1,2,*
Bowen Zhu
1
Jiao Zhang
2
[ ... ]
Feng Zhao
4
Author Affiliations
Abstract
1
Key Laboratory for Information Science of Electromagnetic Waves (MoE), Fudan University, Shanghai 200433, China
2
Purple Mountain Laboratories, Nanjing 211111, China
3
Beijing University of Posts and Telecommunications, Beijing 100876, China
4
Xi’an University of Posts and Telecommunications, Xi’an 710121, China
The terahertz photonics technique has bright application prospects in future sixth-generation (6G) broadband communication. In this study, we have experimentally demonstrated a photonics-assisted record-breaking net bit rate of 417 Gbit/s per wavelength signals delivery in a fiber-wireless converged communication system supported by advanced digital-signal-processing (DSP) algorithms and a polarization multiplexing-based multiple-input multiple-output (MIMO) scheme. In the experiment, up to 60 GBaud (480 Gbit/s) polarization-division-multiplexing 16-ary quadrature-amplitude-modulation (PDM-16QAM) signals are transmitted over 20 km fibers and 3 m wireless
2
×
2
MIMO links at 318 GHz with the bit error rate (BER) under
1.56
×
10
-
2
. It is the first demonstration to our knowledge of signals delivery exceeding 400 Gbit/s per wavelength in a photonics-assisted fiber-wireless converged
2
×
2
MIMO communication system.
terahertz photonics technique
fiber-wireless converged communication
digital signal processing
THz-band
photonics-assisted technique
PDF全文
Full Text
Chinese Optics Letters
2023, 21(7): 073901
Microwave Photonics
Linearized microwave downconversion link based on fast and intelligent impairment equalization for noncooperative systems
Zhiyu Chen
1
Xin Zhong
1
Lin Jiang
2
Jiaxin Xu
1
[ ... ]
Tao Zhou
1,*
Author Affiliations
Abstract
1
Key Laboratory of Science and Technology on Electronic Information Control, Chengdu 610029, China
2
Center for Information Photonics & Communications, School of Information Science & Technology, Southwest Jiaotong University, Chengdu 610031, China
3
Science and Technology on Communication Security Laboratory, Institute of Southwestern Communication, Chengdu 610041, China
We experimentally demonstrated the use of intelligent impairment equalization (IIE) for microwave downconversion link linearization in noncooperative systems. Such an equalizer is realized based on an artificial neural network (ANN). Once the training process is completed, the inverse link transfer function can be determined. With the inverse transformation for the detected signal after transmission, the third-order intermodulation distortion components are suppressed significantly without requiring any prior information from an input RF signal. Furthermore, fast training speed is achieved, since the configuration of ANN-based equalizer is simple. Experimental results show that the spurious-free dynamic range of the proposed link is improved to 106.5 dB · Hz
2/3
, which is 11.3 dB higher than that of a link without IIE. Meanwhile, the training epochs reduce to only five, which has the potential to meet the practical engineering requirement.
microwave photonics
linearized downconversion link
intelligent impairment equalization
artificial neural network
PDF全文
Full Text
Chinese Optics Letters
2023, 21(2): 023902
Microwave Photonics
Single-lane 200 Gbit/s photonic wireless transmission of multicarrier 64-QAM signals at 300 GHz over 30 m
Download:534次
Hongqi Zhang
1,2
Lu Zhang
1,2
Zuomin Yang
2
Hang Yang
2
[ ... ]
Xianbin Yu
1,2,*
Author Affiliations
Abstract
1
Zhejiang Lab, Hangzhou 311121, China
2
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
3
Applied Physics Department, KTH Royal Institute of Technology, 10691 Stockholm, Sweden
4
Networks Unit, RISE Research Institutes of Sweden, 16440 Kista, Sweden
Recently, wireless communication capacity has been witnessing unprecedented growth. Benefits from the optoelectronic components with large bandwidth, photonics-assisted terahertz (THz) communication links have been extensively developed to accommodate the upcoming wireless transmission with a high data rate. However, limited by the available signal-to-noise ratio and THz component bandwidth, single-lane transmission of beyond 100 Gbit/s data rate using a single pair of THz transceivers is still very challenging. In this study, a multicarrier THz photonic wireless communication link in the 300 GHz band is proposed and experimentally demonstrated. Enabled by subcarrier multiplexing, spectrally efficient modulation format, well-tailored digital signal processing routine, and broadband THz transceivers, a line rate of 72 Gbit/s over a wireless distance of 30 m is successfully demonstrated, resulting in a total net transmission capacity of up to 202.5 Gbit/s. The single-lane transmission of beyond 200 Gbit/s overall data rate with a single pair of transceivers at 300 GHz is considered a significant step toward a viable photonics-assisted solution for the next-generation information and communication technology (ICT) infrastructure.
terahertz communication
terahertz photonics
wavelength division multiplexing
photonic-wireless transmission
PDF全文
Full Text
Chinese Optics Letters
2023, 21(2): 023901
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