Performances of a HGCDTE APD based direct detection lidar at 2 μm. Application to dial measurements

A lidar receiver with a direct detection chain adapted to a HgCdTe APD based detector with electric cooling is associated to a 2.05 μm Ho :YLF pulsed dual wavelength single mode transmitter to provide the first atmospheric lidar measurements using this technology. Experiments confirm the outstanding sensitivity of the detector and hightligth its huge potential for DIAL measurements of trace gas (CO2 and H2O) in this spectral domain. Performances of coherent vs direct detection at 2.05 μm is assessed.

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Aerosol Characterization by Dual-Wavelength Polarization Lidar Measurements over Kochi, Japan during the Warm Seasons of 2008 to 2010

Journal of the Meteorological Society of Japan Ser II ◽

10.2151/jmsj.2013-605 ◽

2013 ◽

Vol 91 (6) ◽

pp. 789-800 ◽

Cited By ~ 3

Author(s):

Tetsu SAKAI ◽

Tomohiro NAGAI ◽

Narihiro ORIKASA ◽

Yuji ZAIZEN ◽

Katsuya YAMASHITA ◽

...

Keyword(s):

Dual Wavelength ◽

Lidar Measurements ◽

Aerosol Characterization

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Einmodige Quantenkaskadenlaser für Anwendungen in der Spurengasanalytik (Single-Mode Quantum Cascade Lasers for Applications in Trace-Gas Sensing)

tm - Technisches Messen ◽

10.1524/teme.72.6.356.65632 ◽

2005 ◽

Vol 72 (6/2005) ◽

Cited By ~ 1

Author(s):

Christian Mann ◽

Q. Yang ◽

F. Fuchs ◽

W. Bronner ◽

K. Köhler ◽

...

Keyword(s):

Gas Sensing ◽

Quantum Cascade Lasers ◽

Single Mode ◽

Trace Gas ◽

Quantum Cascade ◽

Trace Gas Sensing ◽

Cascade Lasers

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Tunable and Switchable Erbium-Doped Fiber Laser Using a Multimode-Fiber Based Filter

Applied Sciences ◽

10.3390/app8071135 ◽

2018 ◽

Vol 8 (7) ◽

pp. 1135 ◽

Cited By ~ 11

Author(s):

Anum Khattak ◽

Gerard Tatel ◽

Li Wei

Keyword(s):

Fiber Laser ◽

Single Mode ◽

Polarization Controller ◽

Dual Wavelength ◽

Comb Filter ◽

Multimode Fiber ◽

Erbium Doped ◽

Optical Fiber Sensing ◽

The Difference ◽

Spectral Ranges

We demonstrated a compact tunable and switchable single/dual-wavelength erbium-doped fiber laser. The fiber laser can be tuned and switched from single-wavelength to dual-wavelength oscillation by using our recently proposed tunable comb filter. The comb filter consists of a section of multimode fiber (MMF) coiled into a polarization controller and two sections of single mode fibers (SMFs) to form a SMF/MMF/SMF structure, serving as a simple tunable all-fiber Mach-Zehnder interferometer. Due to the insertion of the MMF-based polarization controller (PC), an additional phase shift is introduced from the difference of the birefringence intensity in different dominant modes, which can be used to tune the fiber laser. In the experiment, by properly adjusting the PC, a tuning range of 9.3 nm can be achieved for the single-wavelength operation. Moreover, dual-wavelength operation with different free-spectral-ranges can be obtained. The tunable and switchable fiber lasers are of great importance for their applications in optical testing, optical fiber sensing, and signal processing.

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Demonstration of C-band 112G PAM-4 transmission over 80-km stand-single mode fiber based on direct-detection

Optics Communications ◽

10.1016/j.optcom.2018.02.032 ◽

2018 ◽

Vol 424 ◽

pp. 32-36

Author(s):

Yiran Wei ◽

Jianjun Yu ◽

Jianyang Shi ◽

Junwen Zhang ◽

Jing He ◽

...

Keyword(s):

Direct Detection ◽

Single Mode ◽

Single Mode Fiber

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Single input state, single mode fiber based spectral domain polarization sensitive optical coherence tomography using a single linear-in-wavenumber spectral camera

Optics and Lasers in Engineering ◽

10.1016/j.optlaseng.2019.105948 ◽

2020 ◽

Vol 127 ◽

pp. 105948

Author(s):

Tong Wu ◽

Keming Cao ◽

Xuhui Wang ◽

Ruibin Pan ◽

Wenqi Huo ◽

...

Keyword(s):

Optical Coherence Tomography ◽

Single Mode ◽

Single Mode Fiber ◽

Spectral Domain ◽

Input State ◽

Optical Coherence ◽

Single Input

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Efficient Blind Adaptive CSE to Reduce Cyclic Prefix Length in Direct Detection Optical OFDM Systems

Journal of Optical Communications ◽

10.1515/joc-2018-0165 ◽

2019 ◽

Vol 0 (0) ◽

Author(s):

Asmaa Benieddi ◽

Sid Ahmed Elahmar

Keyword(s):

Orthogonal Frequency Division Multiplexing ◽

Direct Detection ◽

Group Velocity Dispersion ◽

Signal To Noise Ratio ◽

Single Mode ◽

Optical Signal ◽

Single Mode Fiber ◽

Cyclic Prefix ◽

Ofdm Systems ◽

Blind Adaptive

AbstractDirect detection optical orthogonal frequency division multiplexing (DDO-OFDM) systems for a long-reach of standard single mode fiber (SSMF) require a large length of cyclic prefix (CP) to avoid the inter-symbol interference (ISI) effect caused by group velocity dispersion (GVD). Unfortunately, this method is inefficient due to the energy wasted in CP samples. In order to reduce the CP length and to mitigate the residual ISI, a novel blind adaptive channel shortening equalizer (CSE) is proposed in this paper. Based on the orthogonality between subcarriers in the fast Fourier transform (FFT) property, the proposed algorithm attempts to minimize the sum-squared correlation (SSCM) between each sample located in a well-defined window to update the CSE coefficients. Thus, the combined channel-CSE response is shortened. Therefore, it can cancel the residual ISI effect due to the GVD and the short CP length. The performance of the system is evaluated on basis of bit error rate (BER) versus optical signal to noise ratio (OSNR) for different CP lengths. The simulation results validate the new algorithm SSCM and show that it can reduce the CP length with a much better system improvement than existing algorithms.

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