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Search Publications by: Paul A. Williams (Fed)

Displaying 151 - 175 of 229

Chromatic dispersion measurement error caused by source amplified spontaneous emission

February 22, 2004

Author(s)

Tasshi Dennis, Paul A. Williams

We demonstrate the degrading effect of noise from amplified spontaneous emission on measurements of chromatic dispersion using the modulation phase-shift method. Dramatic performance improvement is achieved with a narrow-band tracking filter.

Polarization-mode dispersion measurement using a six-state RF phase-shift technique for high spectral efficiency

February 22, 2004

Author(s)

Paul A. Williams, Jonathan D. Kofler

We demonstrate record spectral efficiency for RF phase shift measurement of differential group delay and principal states of polarization. Unaveraged uncertainty is below 40 fs in 4.92 GHz bandwidth. Uncertainties and measurement procedures are detailed.

Narrow-band measurement of differential group delay by a six-state RF phase-shift technique: 40 fs single-measurement uncertainty

February 1, 2004

Author(s)

Paul A. Williams, Jonathan D. Kofler

We describe in detail our implementation of a modulation phase shift (MPS) technique for narrow-bandwidth measurement of differential group delay (DGD) and the principal states of polarization (PSP) in optical fibers and components. Out MPS technique

Recent Progress in Polarization Mode Dispersion Measurement

October 1, 2003

Author(s)

Kent B. Rochford, Paul Leo, D Peterson, Paul A. Williams

Measurement of polarization mode dispersion (PMD) spans from precise component characterization of differential group delay (DGD) to system characterization of mean DGD and dynamic PMD properties. We describe recent advances and issues in these varied

High-resolution Group Delay Measurements of a Hydrogen Cyanide Gas Cell Using Low-coherence Interferometry

September 1, 2002

Author(s)

Shellee D. Dyer, Robert J. Espejo, Paul A. Williams

We demonstrate interferometric measurements of the relative group delay of a hydrogen cyanide gas cell with group-delay resolution of 0.3 ps at a wavelength resolution of 6 pm. We use simulations and measured data to illustrate the tradeoffs between group

Measurement and mitigation of multiple reflection effects on the Differential Group Delay spectrum of optical components

September 1, 2002

Author(s)

Paul A. Williams, Jonathan D. Kofler

Ripple in the Differential Group Delay (DGD) spectrum due to multiple reflections is described theoretically and demonstrated experimentally. A technique of tilting the cavity element to reduce these multiple reflection effects is discussed and is

Technical Digest Symposium on Optical Fiber Measurements, 2002

September 1, 2002

Author(s)

Paul A. Williams, Gordon W. Day

This digest contains the papers presented at the 2002 Symposium on Optical Fiber Measurements, a 2-1/2 day forum devoted to measurements of fibers, integrated optics, components and systems. Topics covered include measurement of polarization-mode

Standard Reference Material 2538 for Polarization-Mode Dispersion (Non-Mode-Coupled)

July 1, 2002

Author(s)

Paul A. Williams, Shelley M. Etzel, Jonathan D. Kofler

A temperature-controlled, single-mode-fiber-pigtailed quartz plate has been assembled as an artifact standard for polarization-mode dispersion (non-mode-coupled). The design parameters and performance of this device are discussed. The artifact, Standard

PMD Measurement Techniques - Avoiding Measurement Pitfalls

June 1, 2002

Author(s)

Paul A. Williams

Polarization-mode dispersion (PMD) is an interesting phenomenon. Unfortunately, interesting usually means complicated, and that is definitely the case with PMD. These complications can be troublesome when attempting to measure PMD. This presentation has

Fiber and Component Metrology for High-Speed Communications

January 1, 2002

Author(s)

Tracy S. Clement, Paul D. Hale, Paul A. Williams

Increased data rates require improved measurements. We give specific guidance to avoid measurement pitfalls in two critical high data rate areas: Polarization-mode dispersion and transmitter/receiver frequency response. For audiences familiar (not expert)

Relative Group Delay Measurements with 0.3 ps Resolution: Toward 40 Gbit/s Component Metrology

January 1, 2002

Author(s)

Tasshi Dennis, Paul A. Williams

We demonstrate relative group delay measurements on a molecular absorption line using a modulation phase shift technique yielding 0.3 ps resolution. Measured features as small as [approximately}1 ps in a hydrogen cyanide gas cell are shown to agree well

Optical Metrology for Wavelength-Division-Multiplexed Fiber Communications

March 1, 2001

Author(s)

Sarah L. Gilbert, Shellee D. Dyer, Paul A. Williams, Allen Rose

In response to rapid changes in fiber-optic technology, the Optoelectronics Division of the National Institute of Standards and Technology has been developing techniques and standards to support the measurement of optical components and subsystems used in

Technical Digest, Symposium on Optical Fiber Measurements, 2000

September 1, 2000

Author(s)

Paul A. Williams, Gordon W. Day

Polarization mode dispersion (PMD), multimode fiber parameters, fiber geometry and chromatic dispersion mapping in fibers are some of the measurement issues in this digest of papers presented at the Symposium on Optical Fiber Measurements held September 26