Differential mode delay (DMD) in graded-index multimode fiber: effect of DMD on bandwidth tuned by restricted launch conditions

Lieber, W.; Yi, Xingwen; Nontasut, N.; Curticapean, Dan

doi:10.1007/s00340-002-1013-6

Cited by 10 publications

(2 citation statements)

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“…It has been shown that the expanded mode from a gapped launch from a single mode fiber to a graded index fiber launches into higher order modes, indicated by its bandwidth reduction [16]. …”

Section: Graded Index Fiber Gap Launching Characterizationmentioning

confidence: 99%

High-sensitivity near-IR absorption measurements of nanoliter samples in a cavity enhanced fiber sensor

Gomez¹,

Fruetel²,

Bambha³

2009

SPIE Proceedings

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A compact fiber optic sensor is described using Incoherent Broad-Band Cavity Enhanced Absorption Spectroscopy for sensitive detection of nanoliter samples of aqueous chemicals and microorganisms in capillaries. Absorption was measured in a 70 µm gap, comparable to the inside diameter of a capillary used for electrophoresis, between the ends of two short segments of multimode fiber. The other ends of the fibers were optically contacted to dielectric mirrors to form an 11-cm cavity resonator. Light from a superluminescent diode (λ=1054 nm, BW=35 nm FWHM) was coupled into one end of the cavity, and transmission through the cavity was measured using a silicon photodiode. Dilute aqueous solutions of near infrared dye were used to determine the minimum detectable absorption change of 4x10 -6 for 10 second integration and unity signal-to-noise ratio, which is approximately two orders of magnitude more sensitive than previously published results for systems with comparable sample path lengths.

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Section: Graded Index Fiber Gap Launching Characterizationmentioning

confidence: 99%

High-sensitivity near-IR absorption measurements of nanoliter samples in a cavity enhanced fiber sensor

Gomez¹,

Fruetel²,

Bambha³

2009

SPIE Proceedings

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“…The selective excitation of low order modes by single mode launching into graded index fibers is known for its importance with applications in the telecommunications industry [18][19][20][21]. It has been shown that the expanded mode from a gapped launch from a single mode fiber to a graded index fiber launches into higher order modes, indicated by its bandwidth reduction [22].…”

Section: Graded Index Fiber Gap Launching Characterizationmentioning

confidence: 99%

Microbial agent detection using near-IR electrophoretic and spectral signatures (MADNESS) for rapid identification in detect-to-warn applications.

Gomez¹,

Bambha²,

VanderNoot³

et al. 2009

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Rapid identification of aerosolized biological agents following an alarm by particle triggering systems is needed to enable response actions that save lives and protect assets. Rapid identifiers must achieve species level specificity, as this is required to distinguish disease-causing organisms (e.g., Bacillus anthracis) from benign neighbors (e.g., Bacillus subtilis). We have developed a rapid (1-5 minute), novel identification methodology that sorts intact organisms from each other and particulates using capillary electrophoresis (CE), and detects using near-infrared (NIR) absorbance and scattering. We have successfully demonstrated CE resolution of Bacillus spores and vegetative bacteria at the species level. To achieve sufficient sensitivity for detection needs (~10 4 cfu/mL for bacteria), we have developed fibercoupled cavity-enhanced absorbance techniques. Using this method, we have demonstrated ~two orders of magnitude greater sensitivity than published results for absorbing dyes, and single particle (spore) detection through primarily scattering effects. Results of the integrated CE-NIR system for spore detection are presented.

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New aspects in bandwidth measurements considering the effects of DMD

Bunge

Lieber

Curticapean

2007

Optics & Laser Technology

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Differential mode delay (DMD) in graded-index multimode fiber: effect of DMD on bandwidth tuned by restricted launch conditions

Cited by 10 publications

References 0 publications

High-sensitivity near-IR absorption measurements of nanoliter samples in a cavity enhanced fiber sensor

High-sensitivity near-IR absorption measurements of nanoliter samples in a cavity enhanced fiber sensor

Microbial agent detection using near-IR electrophoretic and spectral signatures (MADNESS) for rapid identification in detect-to-warn applications.

New aspects in bandwidth measurements considering the effects of DMD

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