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Power-stabilized 3-W blue laser locked to the 420-nm transition in rubidium

Physical Review Applied 2024年第3期22卷 034045页

作者： Jia Zhang Xiaolei Guan Xun Gao Zhiyang Wang Xiaomin Qin Zijie Liu Hangbo Shi Jianxiang Miao Tiantian Shi Jingbiao Chen State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum Electronics School of Electronics School of Integrated Circuits National Key Laboratory of Advanced Micro and Nano Manufacture Technology Beijing 100871 China Hefei National Laboratory Hefei 230088 China

Using modulation transfer spectroscopy, we achieve the frequency stabilization of a high-power 3-W blue laser at the wavelength of 420 nm to the Rb 5S1/2–6P3/2 transition. The in-loop frequency stability of this laser is 1.8×10−11/τ, reaching 1.7×10−12 at 100 s and 7×10−13 at 1000 s. An external power feedback loop is established using an acousto-optic modulator, employing the zeroth-order diffracted light for power stabilization, achieving an in-loop power stability of 1.0×10−6 at 1 s. Moreover, the continuous mode-hop free interval of this high-power laser can simultaneously cover the 5S1/2–6P3/2 transitions of 85Rb and 87Rb, with successful locking achieved for both isotopes, providing a comprehensive analysis of the Rb atomic transitions in the blue spectral region. As an application, this 3-W 420-nm laser with excellent power and frequency stabilities is used as a repumping source for diffuse laser cooling of 87Rb atoms, realizing a one-meter-long cold-atom cloud. This paves the way for using blue-light cooling to realize a cold-Rb-atom active optical clock. In addition, the ultrahigh-stability 420-nm laser also finds applications in various fields such as the Rydberg atom experiment, Bose-Einstein condensation, ultranarrow-bandwidth Faraday atomic filter, and so on.

关键词： Atomic spectra Atomic, optical & lattice clocks Lasers optical quantum information processing Alkali metals Atomic gases optical second-harmonic generation optical spectroscopy

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Statistical Characteristics of Distributed Modal Crosstalk for Weakly-Coupled FMF Transmission

Statistical Characteristics of Distributed Modal Crosstalk f...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Qiao, Gang Zuo, Mingqing Zhang, Jiarui Long, Chengbin He, Yongqi Chen, Zhangyuan Li, Juhao State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing100871 China Department of Fundamental Network Technology China Mobile Research Institute Beijing100053 China Peng Cheng Laboratory Shenzhen518055 China

We experimentally show that noise induced by the distributed modal crosstalk in weakly-coupled FMFs is well approximated by Gaussian distribution. Its impact on weakly-coupled MDM transmission systems is experimentall... 详细信息

ISBN: (纸本)9781957171258

关键词： Crosstalk

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Intelligent Intra- and Inter-Channel Nonlinearity Compensation for Terabit-Per-Lambda 16QAM Long-Haul Transmission

Intelligent Intra- and Inter-Channel Nonlinearity Compensati...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Xiansong Fang Lingjun Zhou Yixiao Zhu Jiayu Zheng Xiang Cai Fan Zhang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Peking University Beijing China School of Electronic and Computer Engineering Peking University Shenzhen China State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China Pengcheng Laboratory Shenzhen China

We experimentally demonstrate the combination of learned modified DBP and adaptive equalizer to compensate for intra- and inter-channel nonlinearity, in an $8\times 125\text{Gbaud}$ 16QAM system over 1600km SSMF, sh...

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8-inch wafer level through glass via (TGV) interposer with 110-GHz bandwidth facing 128-GBaud 2.5D co-packaged optics (CPO)

8-inch wafer level through glass via (TGV) interposer with 1...

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2024 Asia communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and optical communications, IPOC 2024

作者： Ge, Chang Wang, Xinyi Du, Jiangbing Lin, Xiaozhong Lei, Ting Du, Luping He, Zuyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China Research and Development Department Shenzhen Photonics Valley Technology Co. Ltd. Shenzhen518114 China Nanophotonics Research Center Shenzhen Key Laboratory of Microscale Optical Information Technology Institute of Microscale Shenzhen University Shenzhen518060 China

TGV interposer fabricated by 8-inch glass wafer with 110-GHz bandwidth and 128-GBaud OOK signal interconnection is presented. Flip-chip packaging of EML and EIC chips were realized, proving great potential in 2.5D CPO... 详细信息

ISBN: (纸本)9798350379266

关键词： Flip chip devices

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Whispering-gallery-mode barcode-based broadband sub-femtometer-resolution spectroscopy with an electro-optic frequency comb

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advanced Photonics 2024年第1期6卷 115-125页

作者： Bingxin Xu Yangyang Wan Xinyu Fan Zuyuan He Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and NetworksDepartment of Electronic EngineeringShanghaiChina Max-Planck Institute of Quantum Optics Hans-Kopfermann-Straûe 185748 GarchingGermany

Spectroscopy is the basic tool for studying molecular physics and realizing biochemical ***,it is challenging to realize sub-femtometer resolution spectroscopy over broad *** and high-resolution spectroscopy with calibrated optical frequency is demonstrated by bridging the fields of speckle pattern and electro-optic frequency comb.A wavemeter based on a whispering-gallery-mode barcode is proposed to link the frequencies of a probe continuous-wave laser and an ultrastable *** ultrafine electro-optic comb lines are generated from the probe laser to record spectrum of sample with sub-femtometer *** bandwidth is a thousandfold broader than comb bandwidth,by sequentially tuning the probe laser while its wavelength is *** approach fully exploits the advantages of two fields to realize 0.8-fm resolution with a fiber laser and 80-nm bandwidth with an external cavity diode *** spectroscopic measurements of an ultrahigh Q-factor cavity and gas molecular absorption are experimentally *** compact system,predominantly constituted by few-gigahertz electronics and telecommunication components,shows enormous potential for practical spectroscopic applications.

关键词： frequency comb reconstructive wavemeter spectroscopy

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Tunable High Precision Signal Processing Based on the Simultaneous Photonic Filtering and Digitizing system

Tunable High Precision Signal Processing Based on the Simult...

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2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023

作者： Sun, Yiwei Tan, Qinggui Wang, Di Liang, Dong Wang, Sitong Gong, Jingwen Wu, Guiling Xi'an710010 China The State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Institute for Advanced Communication and Data Science Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China Shanghai Huawei Technologies Company Ltd. Shanghai201206 China

ISBN: (纸本)9798350345995

With the development of the communication and radar systems, the demand for precisely processing broadband signal has become urgent. The basic functions of filtering and digitizing are often needed together in many applications such as antialiasing and interference suppression in digital receivers. To break the bottleneck of the traditional methods, a recently-proposed simultaneous photonic filtering and digitizing system[1] can achieve analog pre-filtering and digitizing at the same time, and its equivalent system response can be tuned by shaping the optical sampling pulses. However, limited by the dilemma between the precision and duration of the shaped pulses, the bandwidth of the signal processing are constraint. The design rules to achieve precise signal procession are analysed. An optical shaping scheme based on the interference and frequency-to-time mapping is utilized in the system[2], as shown in Fig. 1(a). The response of the OF is G(ω), and the tunable delay difference between interference arms is τ. The dispersive value of the SMF is Φv. The RF signals are processed and digitized in the IMDD link and EADC[2]. The equivalent system response HA(ω) for signal processing is HA(ω) ∝ (∑∞n=0 F (G (Φtυ )) |ω=n2π Ts. HE(ω) ∗ δ (ω − n 2πTs).) ∗ [δ(ω) + 2I0. δ (ω − Φτυ )], (1) where HE(ω) is the frequency response of the devices from PD to ADC. Ts is the period of the MLL. The equivalent system response is non-periodic and composed by two identical receiving passbands located at DC and ω = τ/Φv. The passband is the superposition of HE(ω), with the coefficients determined by the Fourier transform of G(t/Φv). If the bandwidth of F(G(t/Φv)) is narrower than ωs = 2π/Ts, then the passband is determined by HE(ω) since there is only one delta function left in the brace bracket. Thus, the precision of the signal processing can be improved to HE(ω), which usually not exceeds hundreds of MHz. ωs should be ωs ≥ Φ2πKυ.B, (2) to increase the procession precision. K and B are th

关键词： Bandwidth

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Butler matrix enabled multi-beam optical phased array for two-dimensional beam-steering and ranging

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Photonics Research 2024年第5期12卷 912-920页

作者： ZUOYU ZHOU WEIHAN XU CHUXIN LIU RUIYANG XU CHEN ZHU XINHANG LI LIANGJUN LU JIANPING CHEN LINJIE ZHOU State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Laboratory of Navigation and Location ServicesShanghai Institute for Advanced Communication and Data ScienceDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu 314200China State Grid Sichuan Electric Power Company Chengdu Xinjin Power Supply Branch Xinjin 611430China

Based on the wavelength transparency of the Butler matrix(BM)beamforming network,we demonstrate a multibeam optical phased array(MOPA)with an emitting aperture composed of grating couplers at a 1.55μm pitch for wavelength-assisted two-dimensional *** device is capable of simultaneous multi-beam operation in a field of view(FOV)of 60°×8°in the phased-array scanning axis and the wavelength-tuning scanning axis,*** typical beam divergence is about 4°on both *** multiple linearly chirped lasers,multibeam frequency-modulated continuous wave(FMCW)ranging is realized with an average ranging error of 4 cm.A C-shaped target is imaged for proof-of-concept 2D scanning and ranging.

关键词： optical tuning beam

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Near-Far Field Codebook Design for IOS-Aided Multi-User communications

Near-Far Field Codebook Design for IOS-Aided Multi-User Comm...

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IEEE Conference on Global communications (GLOBECOM)

作者： Shupei Zhang Yutong Zhang Boya Di State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China

Recently, the rapid development of metasurface facilitates the growth of extremely large-scale antenna arrays, making the ultra-massive MIMO possible. In this paper, we study the codebook design and beam training for an intelligent omni-surface (IOS) aided multi-user system, where the IOS is a novel metasurface enabling simultaneous signal reflection and refraction. To deal with the near field expansion caused by the large-dimension of IOS, we design a near-far field codebook to serve users both in the near and far fields without prior knowledge of user distribution. Moreover, to fully exploit the dual functionality of the IOS, the coupling between the reflective and refractive signals is analyzed theoretically and utilized in the codebook design, thereby reducing the training overhead. On this basis, the multi-user beam training is adopted where each codeword covers multiple areas to enable all users to be trained simultaneously. Simulation results verify our theoretical analysis on the reflective-refractive coupling. Compared to the state-of-the-art schemes, the proposed scheme can improve the sum rate and throughput.

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Performance Comparison Between Core and Cladding Pump Schemes for Weakly-coupled Multi-core EDFAs

Performance Comparison Between Core and Cladding Pump Scheme...

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International Conference on optical communications and networks (ICOCN)

作者： Baolong Zhu Shuailuo Huang Yu Yang Chengbin Long Zhangyuan Cheng Yongqi He Juhao Li State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China

Performance between core and cladding pump schemes are simulatively compared based on weakly-coupled 7-core-single-mode and 7-core-3-mode EDFs. The results show that the two schemes have significant performance differ...

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Bright/dark switchable mode-locked fiber laser based on alcohol

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Chinese Optics Letters 2024年第3期22卷 71-75页

作者：张文艳江慧洁杨坤刘楠楠耿利杰郝蕴琦贤天浩詹黎 Henan Key Laboratory of Magnetoelectronic Information Functional Materials School of Physics and Electronic EngineeringZhengzhou University of Light IndustryZhengzhou 450002China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China

A passively switchable erbium-doped fiber laser based on alcohol as the saturable absorber(SA)has been *** SA is prepared by filling the gap between two optical patch cords with alcohol to form a sandwich *** modulation depth of the alcohol-SA is measured to be 6.4%.By appropriately adjusting the pump power and the polarization state in the cavity,three kinds of mode-locked pulse patterns can be achieved and switched,including bright pulse,bright/dark soliton pair,and dark *** different soliton emissions all operate at the fundamental frequency state,with a repetition rate of 20.05 MHz and a central wavelength of~1563 *** the best of our knowledge,this is the first demonstration of a switchable soliton fiber laser using alcohol as the *** experimental results further indicate that organic liquid-like alcohol has great potential for constructing ultrafast lasers.

关键词： optical solitons fiber lasers alcohol pulsed lasers

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