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Design and analysis of flexible colorless remote node using RSOA-assisted michelson interferometer

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Chinese Optics Letters 2011年第2期9卷 23-26页

作者：刘磊张民刘明涛张小频叶培大 Key Laboratory of Information Photonics and Optical Communications Ministry of EducationBeijing University of Posts and Telecommunications

A scheme of flexible colorless remote note with reflective semiconductor optical amplifier （RSOA） assisted michelson interferometer is proposed. This is capable of generating an optical carrier suppressed signal at a specific radio frequency to suppress the penalty brought about by Rayleigh backscattering and reflection in a full-duplex single fiber transmission network. Simulations are conducted, and the validation of the proposal is discussed by observing the penalty eye opening factor. The results are useful for designing cost-effective multi-wavelength passive optical network （PON） or radio-over-fiber （RoF） systems.

关键词： Fiber optic networks michelson interferometers Optical instruments Radio broadcasting Radio transmission Semiconductor optical amplifiers

Phase noise characteristics of narrow-linewidth fiber laser and laser diode in unbalanced interferometers

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Chinese Optics Letters 2013年第2期11卷 55-57页

作者：周会娟陈伟孟洲孙崇峰 College of Opto-electronic Science and Engineering National University of Defense Technology Institute of Information Science and Engineering Henan University of Technology

The phase noises of two narrow-linewidth fiber laser and laser diode are measured by using unbalanced michelson interferometers with various optical path differences （OPDs）. The measured results indicate that the phase noises of the two lasers do not change linearly with the OPD over the range from 1 to 100 m. The laser diode exhibits phase noise levels higher than that of the fiber laser at OPDs longer than 10 m. However, the laser diode outperforms the fiber laser at OPDs shorter than 10 m. The results obtained can assess laser performance and determine the suitable laser for use in a particular application.

关键词： michelson interferometers Phase noise

A compact interferometer insensitive to scanning speed variations

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Chinese Optics Letters 2013年第2期11卷 51-54页

作者：杨庆华赵葆常曾晓东 School of Technical Physics Xidian University Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences

A compact moving optical-wedge interferometer （CMOWI） is presented. This device consists of a moving optical wedge （MOW）, a fixed optical wedge （FOW）, a fixed compensating plate, and a beam-splitting cube. The optical path difference （OPD） is calculated and analyzed. The factor between the OPD and the displacement of the MOW is less than 1 if the refractive index and wedge angle of the MOW and FOW are chosen properly. Therefore, the CMOWI is insensitive to scanning speed variations compared with the traditional michelson interferometer. The CMOWI is compact, small-sized, and suitable for low-resolution Fourier transform spectroscopy.

关键词： michelson interferometers

Interferometric measurement of injection nozzles using ultra-small fiber-optical probes

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Chinese Optics Letters 2011年第7期9卷 37-40页

作者： Tilo Pfeifer Robert Schmitt Niels Knig Guilherme Francisco Mallmann Fraunhofer Institute for Production Technology Steinbachstr. 17 52074 Aachen Germany Laboratory for Machine Tools and Production Engineering of RWTH Aachen University

The measurement of boreholes with diameters smaller than 500 μm is a demanding task that cannot be performed using state-of-the-art production metrology. In this letter, a miniaturized fiber probe with a diameter of 80μm is presented. A probe is used for low-coherence interferometry to conduct highly precise measurements of form deviations of small boreholes. Measurements conducted in nozzles are also presented. The results prove the potential of the fiber-optical sensor for quality inspection of high-precision parts, such as injection nozzles, for common-rail diesel engines.

关键词： Charge coupled devices Fizeau interferometry Low coherence interferometry Metrology michelson interferometers Optical fibers

Experimental study of Fourier transform spectrometer based on MEMS micro-mirror

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Chinese Optics Letters 2013年第5期11卷 72-74页

作者：陈建君朱永刘波韦玮王宁张洁 College of Optoelectronic Engineering Chongqing University

We propose a new Fourier transform spectrometer based on programmable microelectromechanical systems （MEMS） micro-mirror and an improved michelson interferometer. The principle of the spectrometer is theoretically analyzed. A signal acquisition unit and an experimental set-up are designed. The spectrum of the polychromatie light source is obtained at a slantwise reflector angle of O.238°. The spectrum is analyzed by this system within the near infrared. The experimental results show that the spectral accuracy is less than 3 nm, and the signal-to-noise ratio （SNR） is 18 dB. The spectral resolution is less than 16 nm.

关键词： Bolometers Electromechanical devices Light sources MEMS michelson interferometers Mirrors Spacecraft instruments

High-temperature reflective sensor based on single fusion-splicing f iber taper without coating

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Chinese Optics Letters 2012年第12期10卷 75-78页

作者：于鹰宇姜澜李本业王素梅吴鸿宾 NanoManufacturing Fundamental Research Joint Laboratory of National Science Foundation of China School of Mechanical EngineeringBeijing Institute of Technology

A high temperature sensor based on an ultra-abrupt tapered fiber michelson interferometer fabricated by the fusion-splicing method is proposed. The sensor consists of a single abrupt taper and the cleaved surface is used as the reflection mirror. The thermal characteristic is investigated at 25 to 1000 ℃. The sensitivity of the sensor is observed to vary with the temperature, that is, 25 and 78 pm/℃ at 25 300 and 300 1 000 ℃, respectively. The michelson interferometer sensors have the advantages of simple structure, cost effectiveness, compactness, and simple fabrication process.

关键词： michelson interferometers Structure (composition)