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Transmittance and phase measurement via self-calibrated balanced heterodyne detection

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Chinese Optics Letters 2018年第6期16卷 44-49页

作者：缪洁张雪洁李展崔子健张琰佳刘德安朱健强 Key Laboratory of High Power Laser and Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China

It is rare for a conventional direct detection method to measure the transmittance uniformity of mirrors with rigorous standards, especially to meet the requirement of transmittance/reflectance and phase detection simultaneously. In this study, a new method of self-calibrated balanced heterodyne detection（SCBHD） is proposed. It can be self-calibrated by a two-channel structure to overcome the environmental effects in large optics scanning detection by employing highly accurate heterodyne interference. A typical transmittance measurement experiment was performed at 1053 nm wavelength via SCBHD. A standard deviation（SD） of 0.038% was achieved in the preliminary experiment. The experimental results prove to reduce the SD by approximately two orders of magnitude compared with the conventional direct detection method in the same condition. The proposed method was verified as being promising not only for its wider dynamic measurement range and its higher accuracy but also for its simultaneous transmittance and phase detection ability.

关键词： heterodyne detection High power lasers Phase measurement Phase modulation Phase shift Transmittance

Ultra-Low Mean-Photon-Number Measurement with Balanced Optical heterodyne detection

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Chinese Physics Letters 2004年第4期21卷 671-674页

作者：李刚李利平杜志静刘涛张天才王军民 StateKeyLaboratoryofQuantumOpticsandQuantumOpticsDevices InstituteofOpto-ElectronicsShanxiUniversityTaiyuan030006

Determination of an ultra-low mean photon number is an important issue, either for precise optical measurement or understanding the interaction between individual atoms and photons inside an optical cavity. By utilizing a homemade balanced optical heterodyne detection system, the cw minimum measurable power of 3.6fW has been reached, whereas the minimum mean photon number of n = 0.0014 in our micro-cavity with finesse of 2×105 and optical length of 48μm can be realized.

关键词： heterodyne detection

Performance Analysis of Temperature and Strain Simultaneous Measurement System Based on heterodyne detection of Brillouin Scattering

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Journal of Electronic Science and Technology of China 2008年第4期6卷 381-384页

作者： Ji-Sheng Zhang Yong-Qian Li Shuo Zhang Li-Juan Zhao Departmentof Electronics and Communication Engineering North China ElectricPower University Baoding 071003 China

Microwave heterodyne detection can be used to measure the temperature and strain distribution along a fiber with high accuracy in a Brillouin optical time domain reflectometry （BOTDR） system. This method involves simultaneous measurement of Brillouin scattering and Rayleigh scattering in fiber, and scanning of Brillouin spectrum to obtain the desired information. This paper presents a simultaneous measurement system of temperature and strain based on microwave detection and analyzed the system performances such as measurement accuracy, dynamic range, and spatial resolution theoretically. The analysis shows that the system can achieve a temperature resolution of 1°C and a strain resolution of 100 μs.

关键词： Brillouin scattering heterodyne detection strain temperature.

Editorial for Focus Issue on Enabling Science and Technology for High-Speed Optical Communications

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Chinese Optics Letters 2010年第9期8卷 815-815页

作者： Tingye Li Zisen Zhao Jianjun Yu AT&T Middletown NJ 07748 USA Wuhan Research Institute of Post and Telecommunications FiberhomeWuhan 430074 China ZTE USA Inc. 33 wood ave. south 2FL Iselin NJ 08830 USAZTE Inc. Beijing 100083 China

Fiber optics underpins the communications infrastructure for the information society today. Cables consisting of hair-like fibers speed data around the globe in the form of rapid pulses of light. Modern telecom infrastructure facilitating high-speed broadband internet would not be possible without it. Rapid progress of advanced modulation formats, coding, optical amplification, coherent detection, and digital signal processing has made significant impact in the field of optical communications.

关键词： Fiber optics heterodyne detection Modulation Optical communications Optical fibers

Signal properties and the optical parameter design of a laser radar

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Signal properties and the optical parameter design of a lase...