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We present a core diameter mismatch refractive index sensor designed in a single-mode SM 600 optical fiber. The sensing region has been achieved by etching out the whole cladding and some portion of the core of the fiber. Effect of the etched core radius on sensitivity of the sensor has been investigated. Sensors response has been experimentally tested for water and acetone. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1408–1411, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25180 [ABSTRACT FROM AUTHOR]

An investigation of the polarization dependent loss (PDL) of macrobending loss sensitive single fiber (1060XP) is presented theoretically and experimentally. The experimental results are in good agreement with the modeling outcomes. Through the comparison of experimental results of PDL between 1060XP fiber with coatings and bare 1060XP fiber, it is shown that the fiber coating has significant impact on the PDL of bend loss sensitive single-mode fiber. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1460–1464, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24388 [ABSTRACT FROM AUTHOR]

The measure of the chromatic dispersion of the optic fibers used in telecommunications networks and high-speed systems is very useful because it permits chromatic-dispersion compensators to be conceived across the wavelength range of interest. The modulation phase-shift method is used to measure chromatic dispersion in a standard single-mode fiber for telecommunication between 1200 and 1600 nm, by measuring the variation of the modulation phase of the transmitted signal modulated by a radio frequency signal, relative to the transmitted signal in a short reference fiber, modulated by the same signal. We verify the reduction of the thermal transitions in the measurement setup and fiber under test, while covering the spool of the fiber. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 174–178, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21298 [ABSTRACT FROM AUTHOR]

In this paper, we present a simple analysis, utilising the ABCD transformation matrix method, to analyze and determine the coupling efficiency and misalignment tolerances between a laser diode and a conically lensed fibre. The calculated and measured results, that is, the coupling efficiencies and transverse misalignments, were compared for microlenses etched at 20, 30, and 40 min. The calculated results agree well with the measured values. The angular misalignments are also calculated to determine their tolerances. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 191–195, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11325 [ABSTRACT FROM AUTHOR]

Pulsed light through the different distance of a single-mode fiber is calculated. The dispersion characteristics are analyzed by the time-window, frequency-window, and time–frequency planes of the Wigner–Vill distribution. Time–frequency analysis can provide more information about the dispersion and energy changes of pulsed light transmission. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 31: 299–302, 2001. [ABSTRACT FROM AUTHOR]

A fundamental relation Smin2+S±2=1 between output light polarization magnitudes with linear light incidence and circular light incidence is found to exist universally in single-mode optical fibers. It is confirmed theoretically and experimentally, and is employed to analyze the SOP-maintaining capability of a fiber. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 16–19, 2001. [ABSTRACT FROM AUTHOR]

Conical microlenses fabricated at the end of single-mode fibers can increase the coupling efficiency between fibers and laser diodes. In this letter, we present, for the first time, a theoretical analysis of the coupling efficiency between a laser diode and a conically lensed fiber, taking into account the effect of reflection from the lens surface. ©2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 24: 254–258, 2000. [ABSTRACT FROM AUTHOR]

A low coupling loss of -1.34 dB has been achieved between a laser diode emitting at around 1.55 µm wavelength and a high numerical aperture MCVD single-mode fiber by fabricating a conical microlens on the end surface of the fiber. Also for the same source a coupling loss of about -3 dB has been achieved when a conventional MCVD singlemode fiber with a core diameter of 7.3 µm was used. [ABSTRACT FROM AUTHOR]

Since an optical switch is an essential optical device for increasing the reliability of optical fiber communication systems and expanding the functions of various test equipment and measurement instruments, the realization of a practical optical switch is a necessity. Therefore, a compact and high performance latching type single-mode fiber switch has been developed using the micro-machining technique. In this paper, the design concept and driving conditions of the optical fiber switch as well as the characteristics and applications of the fabricated switch are described. A 1 × 2 latching type optical switch is constructed in which a micromagnetic alloy pipe installed on the optical fiber is driven by a magnetic circuit consisting of permanent magnets and a solenoid. The fabricated switch has excellent optical performance, with an insertion loss of 0.34 dB and a return loss of 49 dB. The minimum operating power is 15 mA × 0.6 V and the operating speed is 2 ms. No damage or performance degradation is found after 108 cycles of continuous switching and various environmental tests. Applications of the switch in an optical transmitter are described and it is shown that the design concept of the switch is suitable for high performance switches and extended applications. © 1998 Scripta Technica. Electron Comm Jpn Pt 2, 80(6): 49–57, 1997 [ABSTRACT FROM AUTHOR]

The objective of our work is to conduct a theoretical analysis to determine the coupling efficiency between a laser diode (LD) and a hemispherically lensed tapered single-mode fiber (SMF), which takes into account the effect of spherical aberration on the lens surface. The results obtained clearly show that our proposed theoretical method provides a good estimation of the experimental data. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 43: 341–343, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20464 [ABSTRACT FROM AUTHOR]

We demonstrate a field trial of the 40 Gb/s single-channel electrical time-division multiplexing (ETDM) prototype by using KT's installed single-mode fiber (SMF). The prototype consists of a 40-Gb/s optical transmitter, receiver, and four sets of optical amplifiers. In order to provide a practical and economical field trial, we adopt conventional erbium-doped fiber amplifiers (EDFAs) and precise dispersion compensation technology. We obtain the power penalties of 0.5 dB for 10 Gb/s tributary channels after transmission of 219 km. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 304–306, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20123 [ABSTRACT FROM AUTHOR]

The connection loss between single-mode fiber and photonic crystal fiber (PCF) is analyzed by using a full-vector finite-element method. PCF parameters for achieving low loss connection (for example, less than 0.5 dB) are reported. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 378–380, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11387 [ABSTRACT FROM AUTHOR]

Employing the nonlinear compensation technology of having dispersion compensation fiber first, the effects of different compensation ratios on the system performance are numerically analyzed. When the input power is large, and the transmission is an amplifier spacing or long transmission distance, the best system performance can be obtained by employing proper undercompensation. Overcompensation and excessive undercompensation are not suitable for long-distance transmission no matter how much the input power is. The larger the input power is, the shorter is the requirement of DCF length. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 141–143, 1998. [ABSTRACT FROM AUTHOR]

A microlens fabricated on the end of a single-mode fiber (SMF) can increase the coupling efficiency to laser diodes (LDs). A simulation of microlens formation and an analysis of the resulting coupling efficiency have been performed. The results are in good agreement with data obtained experimentally. [ABSTRACT FROM AUTHOR]

The beam divergence angles for the fundamental TE mode both to the directions parallel and perpendicular to the junction plane of InGaAsP/InP semiconductor laser diodes emitting at 1.3 and 1.55 μm have been investigated. The analysis is based on the effective-index method and the results can be used to design laser diodes (LDs) with minimum beam divergence which will improve the coupling efficiency between LDs and single-mode fibers. [ABSTRACT FROM AUTHOR]

The spot sizes for the fundamental TE modes of InGaAsP/ InP laser diodes in directions parallel and perpendicular to the junction plane have been investigated based on the effective refractive index approach. The analytical results are in good agreement with the reported measured values in the literature. The results can be used to calculate the coupling efficiency between laser diodes and single-mode fibers. [ABSTRACT FROM AUTHOR]

A full quantitative evaluation of the depolarization of light may serve to assess concentrations of depolarizing particles in the retinal pigment epithelium and to investigate their role in retinal diseases in the human eye. Optical coherence tomography and optical frequency domain imaging use spatial incoherent averaging to compute depolarization. Depolarization depends on accurate measurements of the polarization states at the receiver but also on the polarization state incident upon and within the tissue. Neglecting this dependence can result in artifacts and renders depolarization measurements vulnerable to birefringence in the system and in the sample. In this work, we discuss the challenges associated with using a single input polarization state and traditional depolarization metrics such as the degree‐of‐polarization and depolarization power. We demonstrate quantitative depolarization measurements based on Jones vector synthesis and polar decomposition using fiber‐based polarization‐sensitive optical frequency domain imaging of the retinal pigment epithelium in a human eye. A quantitative evaluation of the depolarization of light is crucial for analyzing concentrations of depolarizing particles and monitor retinal diseases in the human eye. Traditional depolarization measurements depend on the probing polarization state and make measurements vulnerable to single‐mode fiber and sample birefringence. Müller matrix decomposition provides an absolute measure of depolarization in a fiber‐based system and will allow quantification of the melanin concentration in the retinal pigment epithelium. [ABSTRACT FROM AUTHOR]