Journal of Lightwave Technology

Issue 1 • February 1985

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Displaying Results 1 - 25 of 36
  • [Front cover and table of contents]

    Publication Year: 1985, Page(s): 0
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    Freely Available from IEEE
  • A monolithic common-collector front-end optical preamplifier

    Publication Year: 1985, Page(s):13 - 15
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (393 KB)

    A monolithic transimpedance preamplifier has been developed having a common-collector cascode configuration with shunt feedback, using an advanced bipolar IC process. The measured sensitivity was -35.0 dBm at 140 Mbit/s for an error rate of 10-9and a p-in photodiode responsivity of 0.5 A/W. View full abstract»

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  • A four-channel lightwave subsystem using wavelength division multiplexing

    Publication Year: 1985, Page(s):16 - 20
    Cited by:  Papers (8)  |  Patents (21)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (847 KB)

    A four-channel multimode transmission subsystem employing wavelength division multiplexing (WDM) was assembled and optically evaluated. Diffraction grating devices with identical fibers for inputs and outputs were used for both multiplexing and demultiplexing. The 1-dB full width of the passbands was ∼4 nm thus there was a requirement for wavelength selection and temperature tuning of the co... View full abstract»

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  • Radiation losses from couplers

    Publication Year: 1985, Page(s):31 - 36
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (615 KB)

    The antisymmetric mode of couplers, composed of two parallel fibers, becomes cut off whenVis sufficiently small. We show that the familiar perturbation modes of this coupler give an excellent approximation to the cutoff value ofVpreviously obtained by an exact analysis. More importantly, by using the perturbation modes, we establish that the rate of leakage below cutoff sets ... View full abstract»

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  • A low-crosstalk liquid crystal optical switch

    Publication Year: 1985, Page(s):37 - 38
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (348 KB)

    The performance of a low-crosstalk polarization-insensitive liquid crystal optical switch is reported. Polarization rotation by a nematic twist cell and attenuation by a dynamic scattering cell are the switching mechanisms. The maximum crosstalk ratio for this 1 × 2 optical switch is -82 dB, which is suitable for switching analog as well as digital signals. View full abstract»

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  • Chromatic dispersion measurements over a 50-km single-mode fiber

    Publication Year: 1985, Page(s):51 - 54
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (502 KB)

    Chromatic dispersion has been measured over a 50-km-long single-mode fiber, using five sinusoidally modulated laser diodes. Results indicate that chromatic dispersion characteristics for single-mode fibers with 33-dB optical loss can be evaluated in the1.2-1.6-mum spectral region. View full abstract»

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  • Accurate analysis of single-mode graded-index fiber directional couplers

    Publication Year: 1985, Page(s):59 - 62
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (448 KB)

    We present an accurate coupled-mode analysis to evaluate the coupling characteristics of identical single-mode graded-index fiber directional couplers. We also give an empirical relation for calculating the coupling length of a fiber coupler formed by fibers having profile parameterq, normalized frequencyV, and normalized separationd/a;dis the distance b... View full abstract»

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  • An experimental study of in-plane light scattering in titanium diffused Y-cut LiNbO3optical waveguides

    Publication Year: 1985, Page(s):67 - 76
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (946 KB)

    This paper describes experimental studies on in-plane scattering of TE-polarized light in titanium-diffused Y-cut LiNbO3optical waveguides as a function of the diffusion process parameters of time, temperature, and the initial film thickness. The dependence of surface roughness on the waveguide fabrication parameters is also described. It has been found that as diffusion time and temper... View full abstract»

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  • Low-loss fusion splices of optical fibers

    Publication Year: 1985, Page(s):83 - 92
    Cited by:  Papers (11)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1205 KB)

    A low-loss splicing method, based on discharge fusion of optical fibers by a simple apparatus and by applying pressure between fibers before fusion, was developed. Average splice losses of about 0.07 and 0.15 dB for single-mode (SM) fibers having core diameters of 10 and 7μm, respectively, and 0.02 dB for 50-μm core diameter graded-index (GI) fibers are obtained. Fusion loss and fusion t... View full abstract»

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  • Modal cutoffs in single- and few-mode fiber couplers

    Publication Year: 1985, Page(s):100 - 110
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1047 KB)

    Optical coupling, or crosstalk, between two parallel, identical single- or few-mode fibers is describable as a superposition of the modes of the composite waveguide. Like the modes of a single-fiber waveguide, the modes of the two-fiber waveguide are cut off. Exact and simple accurate asymptotic formulae are derived giving the cutoff value as a function of separation. For single-mode couplers, per... View full abstract»

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  • An integrated 1 × 4 high-speed optical switch and its applications to a time demultiplexer

    Publication Year: 1985, Page(s):116 - 120
    Cited by:  Papers (16)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (637 KB)

    A one-to-four optical switch was fabricated by integrating three interferometric modulators on az-cut LiNbO3substrate. Each of three modulators consists of a symmetric Y-junction and an asymmetric X-junction as 3-dB input and output couplers, respectively, to function as a one-to-two light switching element. They are arranged so that the input light is switched at the first s... View full abstract»

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  • Optical code-multiplex transmission by gold sequences

    Publication Year: 1985, Page(s):121 - 127
    Cited by:  Papers (49)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (830 KB)

    This paper describes a transmission system that uses passive optical multiplexing with gold sequences. The system is composed of an optical fiber network and electrical matched filters, and allows forN + 2asynchronous stations each with a gold sequence address of lengthN. We analyze, theoretically, the error probability of the system and verify the results with experimental d... View full abstract»

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  • Correction to "Polarizer requirements for fiber gyroscopes with high-birefringence fiber and broad-band sources"

    Publication Year: 1985, Page(s): 209
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (50 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1985, Page(s): c4
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    Freely Available from IEEE
  • The bandwidth of a multimode fiber chain

    Publication Year: 1985, Page(s):145 - 154
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (992 KB)

    We propose a new method for evaluating the baseband transmission in a multimode fiber chain. Carnevale and Paek (Bell Syst. Tech. J., vol. 62, pp. 1415-1431, 1983) stated that errors in the fiber manufacturing process will randomly distort a desired index profile, presumably of power-law type. We extend their discussion to the bandwidths of concatenated fibers, by considering Gaussian approximatio... View full abstract»

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  • Integrated optic series and multibranch interferometers

    Publication Year: 1985, Page(s):77 - 82
    Cited by:  Papers (2)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (608 KB)

    Series and multibranch interferometer filters are analyzed and demonstrated. The response of the interferometers for various configurations is estimated. Measured results are presented for two series interferometers and a three branch interferometer realized with Ti indiffused waveguides in Y-cut LiNbO3. View full abstract»

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  • Estimation of submarine optical-fiber cable elongation

    Publication Year: 1985, Page(s):189 - 193
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (528 KB)

    The tensile strain on a submarine optical-fiber cable may reach a nonlinear elastic region when recovered from the sea floor. In this paper, a method is shown to characterize cable elongation up to the nonlinear plastic region by extending wire theory previously developed to evaluate cable strain in the elastic linear region. The results of applying this method to several optical-fiber cables agre... View full abstract»

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  • On weakly guiding single-mode optical waveguides

    Publication Year: 1985, Page(s):199 - 205
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (768 KB)

    This paper presents a powerful technique to treat the problem of wave propagation along weakly guiding single-mode optical waveguides. The shape as well as the 3-D index variation of the guide may be quite arbitrary as along as the weakly guiding character is preserved. The technique is based on the solution of a scalar-wave equation by the forward-marching fast Fourier transform (FFT) method. Exc... View full abstract»

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  • Passive optical star bus with collision detection for CSMA/CD-based local-area networks

    Publication Year: 1985, Page(s):93 - 100
    Cited by:  Papers (7)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1008 KB)

    A prototype 16-terminal passive star bus suitable for carrier sense multiple access with collision detection (CSMA/CD)-based fiber-optic local-area network is described. Operation is at 16 Mbit/s over optical path lengths of 600 m. The optical wavelength is 830 nm. A novel and simple collision detection method based on listening onto the bus is incorporated within the system. In addition, data is ... View full abstract»

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  • Design of a long-range single-mode OTDR

    Publication Year: 1985, Page(s):39 - 46
    Cited by:  Papers (17)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1536 KB)

    The design of a high-performance single-mode optical time-domain reflectometer (OTDR) is discussed. The approach uses a low-noise receiver with a p-i-n diode detector and transimpedance amplifier together with multichannel digital averaging. A dynamic range of 30 dB one way at 1.3 μm is demonstrated with a laser diode source, and with a Nd:YAG laser source the dynamic range is 41 dB one way. View full abstract»

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  • Fundamental studies on flat bunched optical fibers

    Publication Year: 1985, Page(s):159 - 164
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (712 KB)

    To produce an ultra-high fiber count optical cable with ultra-high density for subscriber loop applications, a new multicore fiber format, called "flat bunch fiber" format has been developed and manufactured. Individual cores in a flat bunch fiber format were arranged in a line contacted with neighboring claddings. This new format gave some advantages over existing optical fibers, from high densit... View full abstract»

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  • Intramodal part of the transfer function for an optical fiber

    Publication Year: 1985, Page(s):154 - 158
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (552 KB)

    Intramodal contributions in measurements of optical-fiber bandwidth are investigated theoretically and experimentally in the quasimonochromatic case. A relation is established between the intramodal transfer function and a possibly non-Gaussian source spectrum, which may also vary with modulation frequency. By considering the latter variation in particular, we are able to predict the intramodal le... View full abstract»

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  • Tensile strength of reinforced fusion-spliced optical fibers

    Publication Year: 1985, Page(s):194 - 198
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (496 KB)

    Tensile strength characteristics of reinforced fusion-spliced optical fiber are important to establish a stable optical line in the field. This paper describes theoretical and experimental results on the strength of reinforced fiber. The stripped fiber strengths of fused splice parts and nonheated parts were measured and were found to be different. When a tension is applied to the reinforced fiber... View full abstract»

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  • How modal noise in multimode fibers depends on source spectrum and fiber dispersion

    Publication Year: 1985, Page(s):7 - 12
    Cited by:  Papers (38)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (696 KB)

    The speckle contrast for multimode fibers, and thus the modal noise, is essentially given by the impulse response of the fiber and the power spectrum of the source. Theoretical and experimental results show that laser sources with a large spectrum of narrow longitudinal modes may cause high speckle contrast and important modal noise over more than 1-km length in graded-index multimode fibers. View full abstract»

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  • Determining the effective cutoff wavelength of single-mode fibers: An interlaboratory comparison

    Publication Year: 1985, Page(s):128 - 134
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (696 KB)

    The National Bureau of Standards (NBS), in cooperation with the Electronic Industries Association, conducted an interlaboratory measurement comparison among six fiber manufacturers to determine the effective cutoff wavelength of single-mode fibers. Measurement techniques based on transmitted power were used to determine cutoff wavelength on four fibers designed for single-mode operation at 1300 nm... View full abstract»

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Aims & Scope

The Journal of Lightwave Technology is comprised of original contributions, both regular papers and letters, covering work in all aspects of optical guided-wave science, technology, and engineering. Manuscripts are solicited which report original theoretical and/or experimental results which advance the technological base of guided-wave technology. Tutorial and review papers are by invitation only. Topics of interest include the following: fiber and cable technologies, active and passive guided-wave componentry (light sources, detectors, repeaters, switches, fiber sensors, etc.); integrated optics and optoelectronics; and systems, subsystems, new applications and unique field trials. System oriented manuscripts should be concerned with systems which perform a function not previously available, out-perform previously established systems, or represent enhancements in the state of the art in general.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Peter J. Winzer
Alcatel-Lucent Bell Labs