Particle Dependence of Quenching Effect in an Optical-Fiber-Type Optically Stimulated Luminescence Dosimeter

We report on our research program aimed at clarifying the physical processes leading to the nonlinear optical response of silica optical fibers and at studying the implications of optical nonlinearities on optical pulse propagation and optical switching devices. The dominant physical processes leading to the nonlinear optical response of an optical fiber are nonresonant electronic polarization, with essentially instantaneous response, the Raman interaction, with sub-picosecond response, and electrostriction, with nanosecond response. We present experimental results that show the consequence of each of these processes on the propagation of a light pulse through an optical fiber. We have also performed one of the first direct measurements of the electrostrictive contribution to the nonlinear refractive index of optical fibers. We measure values ranging from 1.5 × 10-16 to 5.8 × 10-16 cm2/W , depending on fiber type. These values are comparable to that of the fast, Kerr nonlinearity (i.e., sum of electronic and Raman contributions) of 2.5 × 10-16 cm2/W . The measured electrostrictive nonlinearities are significantly larger than those predicted by simple models, and the possible explanations of this difference are discussed.

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Simultaneous measurement of substrate temperature and thin-film thickness on SiO2/Si wafer using optical-fiber-type low-coherence interferometry

Journal of Applied Physics ◽

10.1063/1.3058592 ◽

2009 ◽

Vol 105 (1) ◽

pp. 013110 ◽

Cited By ~ 15

Author(s):

Takayuki Ohta ◽

Chishio Koshimizu ◽

Kanta Kawasaki ◽

Keigo Takeda ◽

Masafumi Ito

Keyword(s):

Thin Film ◽

Optical Fiber ◽

Film Thickness ◽

Substrate Temperature ◽

Simultaneous Measurement ◽

Fiber Type ◽

Thin Film Thickness ◽

Low Coherence ◽

Low Coherence Interferometry ◽

Si Wafer

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THEORETICAL EVALUATION OF NONLINEAR EFFECTS ON OPTICAL WDM NETWORKS WITH VARIOUS FIBER TYPES

IIUM Engineering Journal ◽

10.31436/iiumej.v9i2.100 ◽

2010 ◽

Vol 9 (2) ◽

pp. 53-66 ◽

Cited By ~ 2

Author(s):

YASIN M. KARFAA ◽

M. ISMAIL ◽

F. M. ABBOU ◽

A. S. SHAARI

Keyword(s):

Optical Fiber ◽

Stimulated Raman Scattering ◽

Fiber Type ◽

Nonlinear Effects ◽

Single Mode ◽

Single Mode Fiber ◽

Wdm Networks ◽

Fiber Types ◽

Theoretical Evaluation ◽

Wdm Network

A theoretical study is carried out to evaluate the performance of an opticalwavelength division multiplexing (WDM) network transmission system in the presenceof crosstalk due to optical fiber nonlinearities. The most significant nonlinear effects inthe optical fiber which are Cross-Phase Modulation (XPM), Four-Wave Mixing (FWM),and Stimulated Raman Scattering (SRS) are investigated. Four types of optical fiber areincluded in the analysis; these are: single-mode fiber (SMF), dispersion compensationfiber (DCF), non-zero dispersion fiber (NZDF), and non-zero dispersion shifted fiber(NZDSF). The results represent the standard deviation of nonlinearity induced crosstalknoise power due to FWM and SRS, XPM power penalty for SMF, DCF, NZDF, andNZDSF types of fiber, besides the Bit Error Rate (BER) for the three nonlinear effectsusing standard fiber type (SMF). It is concluded that three significant fiber nonlinearitiesare making huge limitations against increasing the launched power which is desired,otherwise, lower values of launched power limit network expansion including length,distance, covered areas, and number of users accessing the WDM network, unlesssuitable precautions are taken to neutralize the nonlinear effects. Besides, various fibertypes are not behaving similarly towards network parameters.

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