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Strain and Temperature Discrimination Based on a Mach-Zehnder Interferometer With Cascaded Single Mode Fibers
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作者 Shiying XIAO Beilei WU +2 位作者 Chunran SUN Zixiao WANG Youchao JIANG 《Photonic Sensors》 SCIE EI CSCD 2023年第1期40-48,共9页
An in-fiber Mach-Zehnder interferometer is proposed for the discrimination of strain and temperature.The sensor is based on two cascaded standard single mode fibers using three peanut tapers fabricated by simple splic... An in-fiber Mach-Zehnder interferometer is proposed for the discrimination of strain and temperature.The sensor is based on two cascaded standard single mode fibers using three peanut tapers fabricated by simple splicing.The cascaded structure excites more frequency components,which induce four sets of interference dips in the transmission spectrum.One set of the spectrum dips have different sensitivities to temperature and strain from those of the other three.The sensor can discriminate strain and temperature by monitoring the wavelength shifts of two spectrum dips.Repeated experiments are taken both for strain and temperature increasing and decreasing scenarios.Experimental results show that Dip 1 has an average strain sensitivity of-0.911 pm/με and an average temperature sensitivity of 49.98pm/℃.The strain sensitivity for Dip 2 is negligible and its average temperature sensitivity is 60.52pm/℃.The strain and temperature resolutions are±3.82με and±0.33℃. 展开更多
关键词 Mach-Zehnder interferometer peanut taper simultaneous measurement single mode fiber strain sensor temperature sensor
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Optical Pulse Compression Based on High-doped Erbium Fiber Amplifier and Standard Single-mode Fiber 被引量:1
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作者 REN Jing JIA Dong-fang LIU Yang LI Ya-bin 《Semiconductor Photonics and Technology》 CAS 2008年第2期90-94,共5页
Proposed is a novel optical pulse compression technique based on high-doped erbium fiber amplifier and standard single-mode fiber(SMF). We used the amplifier with the erbium ion concentration of 6.3×10-3 to ampli... Proposed is a novel optical pulse compression technique based on high-doped erbium fiber amplifier and standard single-mode fiber(SMF). We used the amplifier with the erbium ion concentration of 6.3×10-3 to amplify a hyperbolic secant pulse from a regeneratively mode-locked fiber laser. The central wavelength, pulsewidth and peak power of the pulse are 1 550 nm, 12.5 ps and 3 mW, respectively. Then the amplified pulse with peak power level corresponding to a higher-order soliton is compressed when it propagates through a 3-km-long single-mode fiber. Studied are the compressed pulses under different pump powers and fiber lengths. The results show that it can get a narrower pulse, and solve the difficulty that pulses at low power can not be compressed directly in the fiber. And the construct is compact. 展开更多
关键词 high-doped erbium fiber amplifier SOLITON single mode fiber(SMF) pulse compression
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RESEARCH ON TRANSVERSE STRESS CHARACTER OF SINGLE MODE OPTICAL FIBER
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作者 向永江 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 1995年第1期87-91,共5页
This paperdetails experimental work done to quantify stress measurements made optically utilizing ordinary single mode optical fibers. Strain-induced changes of birefringence for ordinary single mode optical fiber res... This paperdetails experimental work done to quantify stress measurements made optically utilizing ordinary single mode optical fibers. Strain-induced changes of birefringence for ordinary single mode optical fiber responses are characterized against standard stress measurements in a well understand configuration. The experimental scheme for this work and the results are presented in detaial. In this paper, POssible applications for this transverse stress character of single mode fibers are also proposed. 展开更多
关键词 STRESS single mode optical fiber BIREFRINGENCE fiber optic sensing stress-optic coefficient
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Derivation of General Formula for Coupling Loss of Single-mode Fiber Collimators with Gradient-index Rod Lenses
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作者 XIE Hu, LUO Feng guang, CAO Ming cui, YUAN Jing, WAN Zhu jun (State Key Lab.of Laser Technol.,Huazhong University of Sci.& Technol.,Wuhan 430074,CHN) 《Semiconductor Photonics and Technology》 CAS 2003年第4期215-220,共6页
Gradient-index rod lens (GRIN-lens) whose pitch is ordinary value with bevel ferrule coupling system is analyzed, an equivalent method which can be used to analyze this system is put forward, and a general formula for... Gradient-index rod lens (GRIN-lens) whose pitch is ordinary value with bevel ferrule coupling system is analyzed, an equivalent method which can be used to analyze this system is put forward, and a general formula for determining the coupling loss with axes mismatch, radial mismatch, and angular mismatch is derived by use of the Gaussian field approximation and mode-field coupling theory. The experimental results are in good agreement with the theory prediction. It indicates that these formulas are suitable to analyze the gradient-index rod lens coupling system with pigtail fiber. 展开更多
关键词 gradient―index rod lens singlemode fiber coupling loss COLLIMATOR
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Influence of the net gain on characteristic of stochastic resonance in a single-mode laser system 被引量:2
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作者 程庆华 曹力 +1 位作者 徐大海 吴大进 《Chinese Optics Letters》 SCIE EI CAS CSCD 2004年第6期331-333,共3页
The phenomenon of stochastic resonance (SR) is found in a single-mode laser system driven by the colored pump noise with signal modulation and the quantum noise with cross-correlation between the real and imaginary pa... The phenomenon of stochastic resonance (SR) is found in a single-mode laser system driven by the colored pump noise with signal modulation and the quantum noise with cross-correlation between the real and imaginary parts. When the net gain a0 changes, it is found that, 1) the shape of the curve of the signal-to-noise ratio (SNR) versus the pump noise self-correlation time τ exhibits a changing process of multiform SR, from single-peak SR, to simultaneous existence of resonances and suppressions; 2) the curve of SNR. versus signal frequency Ω experiences a complicated changing process from the monotonous descending to the simultaneous appearances of a maximum and a minimum, and finally to monotonous descending; 3) the curve of SNR versus cross-correlation coefficient between the real and imaginary parts of the quantum noise λq appears an acute single-peak SR. Therefore, the net gain ao greatly influences the characteristic of SR of laser system. 展开更多
关键词 Electron resonance Laser applications Signal processing Signal to noise ratio single mode fibers
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4-W single transverse mode Yb^(3+)-doped fiber laser pumped by 915-nm laser diode array 被引量:1
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作者 冯小明 王晓薇 +3 位作者 方高瞻 刘媛媛 王颖 马骁宇 《Chinese Optics Letters》 SCIE EI CAS CSCD 2005年第5期251-252,共2页
A cladding-pumped ytterbium-doped fiber laser is described in this letter. Using unusual pumping source with 915-nm wavelength, slope efficiency up to 75% with respect to absorbed input power and output power is obtai... A cladding-pumped ytterbium-doped fiber laser is described in this letter. Using unusual pumping source with 915-nm wavelength, slope efficiency up to 75% with respect to absorbed input power and output power is obtained, a maximum output power of 4.006 W with fundamental mode is measured. 展开更多
关键词 Optically pumped lasers Semiconductor lasers single mode fibers YTTERBIUM
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Amplified spontaneous emission properties of a single mode Er^(3+)-doped tellurite fiber
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作者 张军杰 戴世勋 +3 位作者 徐时清 汪国年 张丽艳 胡丽丽 《Chinese Optics Letters》 SCIE EI CAS CSCD 2004年第9期543-545,共3页
Spectral characteristics of the amplified spontaneous emission (ASE) from a novel single mode Er^(3+) doped tellurite fiber with D-type cladding is reported in this letter. When pumped at 980 nm, an ASE source that ha... Spectral characteristics of the amplified spontaneous emission (ASE) from a novel single mode Er^(3+) doped tellurite fiber with D-type cladding is reported in this letter. When pumped at 980 nm, an ASE source that has nearly a 100-nm flat FWHM bandwidth is obtained with a fiber length of 30-60 cm. Variation of ASE spectra with pump powers and fiber lengths are measured. Output power up to 2.0 mW is obtained with a launched pump power of 660 mW. 展开更多
关键词 Cladding (coating) ERBIUM Optically pumped lasers single mode fibers Spontaneous emission Tellurium compounds
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Experimental study on high efficiency of Ti:sapphire laser to single-mode fiber coupling
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作者 刘佳 范文慧 《Chinese Optics Letters》 SCIE EI CAS CSCD 2013年第5期25-27,共3页
We experimentally investigate an optimum scheme of coupling a collimated light from a Ti:sapphire laser source into a standard single-mode fiber (SMF). By adjusting the effective numerical aperture (NA) of coupli... We experimentally investigate an optimum scheme of coupling a collimated light from a Ti:sapphire laser source into a standard single-mode fiber (SMF). By adjusting the effective numerical aperture (NA) of coupling lens and eliminating the chromatic aberration, a coupling efficiency of around 70% is finally obtained. This result is close to the maximum value predicted by theoretical simulation. It is well demonstrated that high coupling efficiency between Ti:sapphire laser and SMF can also be obtained by optimizing certain parameters of a coupling lens, without employing any special optical components, or the specific fiber with complex structure. 展开更多
关键词 single mode fibers
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Influence of optical filtering on transmission capacity in single mode fiber communications 被引量:2
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作者 M. Venkata SUDHAKAR Y. Mallikarjuna REDDY B. Prabhakara RAO 《Frontiers of Optoelectronics》 CSCD 2015年第4期424-430,共7页
This paper presents the design and analysis of optical filters that are placed at the output of directly modulated vertical cavity surface emitting laser (VCSEL) in the process of inexpensive transmitter's implemen... This paper presents the design and analysis of optical filters that are placed at the output of directly modulated vertical cavity surface emitting laser (VCSEL) in the process of inexpensive transmitter's implementation for upcoming generation optical access network. Generation of non return to zero (NRZ) optical signal from the transmitter for 110 km error-free single mode fiber (SMF) transmission at 10 Gb/s with bit error rate (BER) of 10-30 in the absence of the external modulator and encoder was proposed. Effects of super-Gaussian and Butterworth optical filters at VCSEL output were demonstrated to maximize performance of SMF optical systems without need of any dispersion compensation technique. 展开更多
关键词 single mode fiber (SMF) optical filter dispersion data rate
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Analysis of Radio over Fiber system for mitigating four-wave mixing effect 被引量:1
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作者 Namita Kathpal Amit Kumar Garg 《Digital Communications and Networks》 SCIE 2020年第1期115-122,共8页
In this paper,an efficient 8-channel 32Gbps RoF(Radio over Fiber)system incorporating Bessel Filter(8/32 RoFBF)has been demonstrated to reduce the impact of non-linear transmission effects,specifically Four-Wave Mixin... In this paper,an efficient 8-channel 32Gbps RoF(Radio over Fiber)system incorporating Bessel Filter(8/32 RoFBF)has been demonstrated to reduce the impact of non-linear transmission effects,specifically Four-Wave Mixing(FWM).The simulation results indicate that the proposed 8/32 RoF-BF system provides an optimum result w.r.t.channel spacing(75 GHz),input source power(0 dBm)and number of input channels(8).In comparison with the existing RoF system,the proposed 8/32 RoF-BF system has been validated analytically and it is found that the performance of the proposed system is in close proximity particularly in FWM sideband power reduction of the order of 4 dBm for the 8-channel 32Gbps RoF system. 展开更多
关键词 Dispersion compensating fiber Four-wave mixing Radio over Fiber single mode fiber Wavelength division multiplexer
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Efficiency and Output Power Evaluation of a Wavelength Converter Based on FWM in a Single Mode Fiber
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作者 B. C. Sarker S. P. Majumder T. Yoshino 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期43-44,共2页
A frequency domain analysis is presented to determine the performance characteristics of a tunable all-optical wavelength converter using four-wave mixing (FWM) in a single mode fiber (SMF) around the zero dispersion ... A frequency domain analysis is presented to determine the performance characteristics of a tunable all-optical wavelength converter using four-wave mixing (FWM) in a single mode fiber (SMF) around the zero dispersion wavelength using two pump lasers. The output converted signal power as well as efficiency evaluated at a bit rate of 10 Gb/s show that the signal power is substantially higher at lower values of wavelength separation. 展开更多
关键词 FWM AS of Efficiency and Output Power Evaluation of a Wavelength Converter Based on FWM in a single mode Fiber in on
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Field Trial of 40 Gbit/s ETDM Prototype System over 219 km of Installed Single Mode Fiber
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作者 Sang Soo Lee Hyun Woo Cho +6 位作者 Sang Kyu Lim Ki Ho Han Jin Soo Han Moo Jung Chu Je Soo Ko Kyeong-Mo Yoon Yong-Gi Lee 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期659-660,共2页
Transmission of 40Gbit/s NRZ signal was successfully demonstrated over 219km of installed SMF in KT's Daejeon area network. After transmission, the measured power penalty was 0.5dB for all the tributary channels.
关键词 of ET BE OVER Field Trial of 40 Gbit/s ETDM Prototype System over 219 km of Installed single mode Fiber
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Producing Regenerated Gratings in Hydrogen-Loaded Single Mode Fiber by Heat Treatment
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作者 Haihu YU Gengmin LI +1 位作者 Xiaofu LI Huiyong GUO 《Photonic Sensors》 SCIE EI CAS 2014年第2期125-127,共3页
The fiber Bragg grating (FBG) is a passive optical fiber component with the refractive index modulated along the fiber length and has been widely applied in fiber sensing systems. High-temperature stable fiber grati... The fiber Bragg grating (FBG) is a passive optical fiber component with the refractive index modulated along the fiber length and has been widely applied in fiber sensing systems. High-temperature stable fiber gratings are promising for uses at high temperatures and attract extensive attention. In this paper, FBGs were inscribed in hydrogen loaded standard single mode fibers with the 248-nm excimer laser, and regenerated gratings were obtained through heat treatment. The shift of the central wavelength of the regenerated FBG had a good linearity with temperature, and the reflectivity of the regenerated FBG could almost keep unchanged at 800 ℃. 展开更多
关键词 Fiber Bragg grating regenerated grating heat treatment single mode fiber hydrogen loading
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Chromatic Dispersion Monitoring Method Based on Phase Shift Technique
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作者 吕辰刚 武星 +4 位作者 曾丽珠 秦一帆 祖鹏 胡志雄 葛春风 《Transactions of Tianjin University》 EI CAS 2007年第1期67-69,共3页
The modulation phase shift method was used to measure chromatic dispersion in a standard single mode fiber for telecommunication. The modulation phase difference of the transmitted light at the wavelength of 1532.16 n... The modulation phase shift method was used to measure chromatic dispersion in a standard single mode fiber for telecommunication. The modulation phase difference of the transmitted light at the wavelength of 1532.16 nm modulated by a radio frequency signal was measured, relative to the transmitted light at the wavelength of 1549.33 nm modulated by the same signal. By introducing a reference light at the wavelength of 1310 nm, a 1310/1550 nm wavelength division multiplexing was used instead of the high cost dense wavelength division multiplexing. In the experiment, two testing lights were coupled with the reference light to the fiber spools of different lengths, respectively. By finite difference method, the chromatic dispersion between the two testing lights was measured, and the fixed errors generated during transmission were less than 0.5 ps/(nm·km). 展开更多
关键词 single mode fiber optical dispersion wavelength division multiplexing phase shift
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DISPERSION COMPENSATION CFBG IN 100km 10Gbit/s RECIRCULATING SYSTEMS
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作者 Yang Aiying Wang Ziyu Zhang Zhaoyi Chen Zhangyuan Wu Deming(National Lab on Local Optic-Fiber Communication Networks & Advance Optical CommunicationSystems, Department of Electronics, Peking University, Beijing 100871) 《Journal of Electronics(China)》 2003年第6期461-466,共6页
A 10 Gbit/s recirculating system is configured with Chirped Fiber Bragg Grating (CFBG) for the dispersion compensation. For the first time, the transmission distance in the loop reaches 1000km with bit error rate of 1... A 10 Gbit/s recirculating system is configured with Chirped Fiber Bragg Grating (CFBG) for the dispersion compensation. For the first time, the transmission distance in the loop reaches 1000km with bit error rate of 10-9. The effect of the group delay ripple of the fiber grating is also investigated in the recirculating systems, and it is shown that the transmission distance is limited to 4 cycles (4× 167.1km ) in the loop with the power penalty fluctuation below 1.0dB. Thus the group delay ripple should be reduced to allow for the wavelength drift of ±5GHz.At the end of this letter, the principles are given for designing long haul recirculating systems with dispersion compensation CFBG. 展开更多
关键词 Chirped fiber Bragg grating single mode fiber Dispersion compensation Bit error rate
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Effects of group-velocity mismatch and cubic-quintic nonlinearity on cross-phase modulation instability in optical fibers 被引量:6
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作者 钟先琼 向安平 《Chinese Optics Letters》 SCIE EI CAS CSCD 2007年第9期534-537,共4页
The synthetic effects of group-velocity mismatch and cubic-quintic nonlinearity on cross-phase modulation induced modulation instability in loss single-mode optical fibers have been numerically investigated. The resul... The synthetic effects of group-velocity mismatch and cubic-quintic nonlinearity on cross-phase modulation induced modulation instability in loss single-mode optical fibers have been numerically investigated. The results show that the quintic nonlinearity plays a role similar to the case of neglecting the group-velocity mismatch in modifying the modulation instability, namely, the positive and negative quintic nonlinearities can still enhance and weaken the modulation instability, respectively. The group-velocity mismatch can considerably change the gain spectrum of modulation instability in terms of its shape, peak value, and position. In the normal dispersion regime, with the increase of the group-velocity mismatch parameter, the gain spectrum widens and then narrows, shifts to higher frequencies, and the peak value gets higher before approaching a saturable value. In the abnormal dispersion regime, two separated spectra may occur when the group-velocity mismatch is taken into account. With the increase of the group-velocity mismatch parameter, the peak value of the gain spectrum gets higher and shorter before tending to a saturable value for the first and second spectral regimes, respectively. 展开更多
关键词 Dispersion (waves) Nonlinear optics Phase modulation single mode fibers
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40-Gb/s PolMux-QPSK transmission using low-voltage modulation and single-ended digital coherent detection 被引量:3
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作者 冯勇 闻和 +1 位作者 张汉一 郑小平 《Chinese Optics Letters》 SCIE EI CAS CSCD 2010年第10期976-978,共3页
We demonstrate a novel 40-Gb/s transmission system over a 10×101-km standard single mode fiber (SSMF) loop. This system features polarization multiplexed quadrature phase shift keying (PolMux-QPSK), lowvoltag... We demonstrate a novel 40-Gb/s transmission system over a 10×101-km standard single mode fiber (SSMF) loop. This system features polarization multiplexed quadrature phase shift keying (PolMux-QPSK), lowvoltage modulation of 2-V peak-to-peak signal amplitude, and home-made 90° optical hybrid with singleended digital coherent detection. Any power amplifers before the modulator and balanced detectors are not used. In the case of low-voltage modulation, coherent detection is much less sensitive to modulator bias offset than delay interferometer-based demodulation. 展开更多
关键词 Electric power transmission MODULATION Optical systems Quadrature phase shift keying single mode fibers
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A novel symmetric 10 Gbit/s architecture with a single feeder fiber for WDM-PON based on chirp-managed laser 被引量:2
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作者 Aftab Hussain 忻向军 +5 位作者 Abdul Latif Ashiq Hussain 余重秀 Abid Munir Yousaf Khan Muhammad Idrees Afridi 《Optoelectronics Letters》 EI 2012年第6期468-472,共5页
We propose the single feeder fiber architecture for wavelength division multiplexing passive optical network(WDM-PON)based on directly modulated chirp managed laser(CML).The downlink(DL)signal output from the laser is... We propose the single feeder fiber architecture for wavelength division multiplexing passive optical network(WDM-PON)based on directly modulated chirp managed laser(CML).The downlink(DL)signal output from the laser is converted to return-to-zero(RZ)differential phase shift signal using a pulse carver.The downstream signal is reused as a carrier for the upstream using intensity modulation technique.Simulation results show the error-free performance at symmetric data rate of 10 Gbit/s per channel with negligible power penalty and improved receiver sensitivity for the uplink(UL),over 25 km standard single-mode fiber(SSMF).A low-cost and reduced circuitry network design is implemented on a single feeder fiber with the elimination of differential encoder and one external modulator. 展开更多
关键词 FEEDING LASERS Network architecture single mode fibers Wavelength division multiplexing
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Refractive index sensors based on the fused tapered special multi-mode fiber 被引量:2
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作者 付兴虎 修艳丽 +5 位作者 刘琴 谢海洋 杨传庆 张顺杨 付广伟 毕卫红 《Optoelectronics Letters》 EI 2016年第1期12-15,共4页
In this paper,a novel refractive index(RI) sensor is proposed based on the fused tapered special multi-mode fiber(SMMF).Firstly,a section of SMMF is spliced between two single-mode fibers(SMFs).Then,the SMMF is proces... In this paper,a novel refractive index(RI) sensor is proposed based on the fused tapered special multi-mode fiber(SMMF).Firstly,a section of SMMF is spliced between two single-mode fibers(SMFs).Then,the SMMF is processed by a fused tapering machine,and a tapered fiber structure is fabricated.Finally,a fused tapered SMMF sensor is obtained for measuring external RI.The RI sensing mechanism of tapered SMMF sensor is analyzed in detail.For different fused tapering lengths,the experimental results show that the RI sensitivity can be up to 444.517 81 nm/RIU in the RI range of 1.334 9—1.347 0.The RI sensitivity is increased with the increase of fused tapering length.Moreover,it has many advantages,including high sensitivity,compact structure,fast response and wide application range.So it can be used to measure the solution concentration in the fields of biochemistry,health care and food processing. 展开更多
关键词 fibers Food processing REFRACTOMETERS single mode fibers
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10 Gb/s symmetric WDM-PON using stable multi-longitudinal mode Brillouin/SOA fiber laser as upstream colorless source 被引量:1
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作者 义理林 李正璇 +3 位作者 张涛 林东 董毅 胡卫生 《Chinese Optics Letters》 SCIE EI CAS CSCD 2011年第12期51-54,共4页
We propose a stable multi-longitudinal Brillouin/semiconductor fiber laser (BSFL) as the upstream source in a bidirectional single-fiber wavelength-division multiplexing-passive optical network (WDM-PON). The down... We propose a stable multi-longitudinal Brillouin/semiconductor fiber laser (BSFL) as the upstream source in a bidirectional single-fiber wavelength-division multiplexing-passive optical network (WDM-PON). The downstream wavelength serves as the pump of the BSFL. Brillouin-frequency-shifted (-10.8 GHz) upstream carrier is generated to suppress the Rayleigh backscattering and back reflection-induced crosstalk. The stable multi-longitudinal operation of the BSFL, attributed to the four-wave mixing (FWM) effect in the semiconductor optical amplifier (SOA) reduces the difficulty of generating a stable single-longitudinal fiber laser-based upstream carrier. Bidirectional symmetric transmission at 10 Gb/s over a 12.5-km single mode fiber with less than 2-dB power penalty is demonstrated. 展开更多
关键词 Fiber lasers Fiber optic networks fibers Four wave mixing Light amplifiers Semiconductor lasers single mode fibers Wavelength division multiplexing
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