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Lightwave Technology, Journal of

Issue 3 • Date June 1985

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Displaying Results 1 - 25 of 45
  • [Front cover and table of contents]

    Publication Year: 1985 , Page(s): 0
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    Freely Available from IEEE
  • Guest editorial

    Publication Year: 1985 , Page(s): 425
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    Freely Available from IEEE
  • 32-Mbit/s star configured optical local area network design and performance

    Publication Year: 1985 , Page(s): 511 - 524
    Cited by:  Papers (8)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1459 KB)  

    This paper describes the transmitter/receiver design and performance of a 32-Mb/s star configured optical local area network (SOLARnet) that uses a 100 × 100 port optical star coupler and CSMA/CD procedure. A new collision detection technique that monitors coding rule violation (CRV) is proposed. Following noise band calculation, the CRV characteristics of the receiver that are restricted by noise or signal collision are discussed, and the actual circuit design is presented. Use of the new technique enables detection of an optical collision signal that is 8 dB lower than the main signal in a field trial. Other results measured in the field trial are also described. View full abstract»

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  • 100-Mbit/s LED-p-i-n transmitter and receiver modules for high-speed local area networks

    Publication Year: 1985 , Page(s): 560 - 564
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (727 KB)  

    100-Mbit/s fiber-optic transmitter and receiver modules using a 1.3-μm light-emitting diode (LED)-p-i-n combination are developed for computer-link applications. The use of a dc-balanced coding scheme is desirable in such applications from the viewpoint of improving the transient response of the system. A modified duobinary class-II coding scheme is applied as a transmission code. Four monolithic integrated circuits, that is, a preamplifier, an automatic-gain-controlled (AGC) amplifier, regenerator, and LED driver, are developed and confirmed to be useful for realizing highly reliable compact modules. These modules are tested using a standard graded-index fiber. An allowable span loss of 12.4 dB is achieved at an error rate of 10-12. The degradation due to the data pattern transients from 1/12 to 11/12 is negligibly small. Total power consumption of modules is a 1.4-W/module pair with a 5-V single power supply. View full abstract»

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  • A core-clad composition for crystallization-free fluoride fibers

    Publication Year: 1985 , Page(s): 569 - 573
    Cited by:  Papers (2)  |  Patents (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (552 KB)  

    Core and clad compositions to realize crystallization-free fluoride fibers are proposed. From the scattering measurements of reheated glasses, it is shown that the projected scattering loss of the fluoride glass fiber with the selected core-clad composition is expected to be 0.0045 dB/km at 4 μm. View full abstract»

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  • Wide passband grating multiplexer for multimode fibers

    Publication Year: 1985 , Page(s): 590 - 594
    Cited by:  Papers (1)  |  Patents (28)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (663 KB)  

    A grating multiplexer in Littrow-configuration is presented, whose passband width-normalized to channel spacing-is comparable with grating demultiplexers. As shown by calculation, a wide passband is attainable by very small input fiber spacing. Using a standard-( 50/125 \mu m)-GI-fiber as transmission fiber, a 1-dB pass-band of 30 nm with a channel spacing of 46 nm is achieved in an 8- channel device. The insertion losses for each channel are in the range 1.4-2.5 dB for 8- or 10-channel devices. View full abstract»

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  • A p-i-n bipolar optical receiver for submarine system application

    Publication Year: 1985 , Page(s): 608 - 611
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    A p-i-n photodiode bipolar optical receiver using a high beta polysilicon emitter transistor has been investigated. The receiver operates from a single 6-V supply, has a dynamic range in excess of 20 dB, and has been tested at bit rates up to 1 Gbit/s. At 280 Mbit/s and 1.3 μm the measured sensitivity was -35 dBm. View full abstract»

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  • A beam propagation method analysis of active and passive waveguide crossings

    Publication Year: 1985 , Page(s): 635 - 642
    Cited by:  Papers (24)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (910 KB)  

    A beam propagation method is employed to analyze the characteristics of crossed optical waveguides and related switches, based on such crossed waveguides. The complex coupling properties of passive crossings are highlighted and general design guidelines for passive devices as well as for switches are given. View full abstract»

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  • A functional approach to the Luneburg's integral for the planar Luneburg lenses design

    Publication Year: 1985 , Page(s): 684 - 687
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (364 KB)  

    Close-form approximate expression for the Luneburg's integral is derived, which warrants an accuracy within 1.5 \times 10^{-6} in the index profile computation for lenses with focal distances exceeding twice the lens radius. Simple integral condition for the computation accuracy controlling is evaluated. View full abstract»

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  • A process for recovering germanium from effluents of optical fiber manufacturing

    Publication Year: 1985 , Page(s): 699 - 705
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (846 KB)  

    Germania is the primary dopant used to control the refractive index profile in optical waveguides. However, its poor efficiency of incorporation and its high cost create a need for recovery. This paper describes a system to recover the unused germanium from the manufacturing effluents. Briefly, the process includes 1) a gas scrubber to incorporate the unreacted germanium into solution, 2) a recirculation system to increase the germanium concentration, 3) a reaction to form a germanium precipitate, and 4) a filtration step to isolate the germanium-containing solids. The process is capable of recovering greater than 95 percent of the unreacted germanium. View full abstract»

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  • [Back cover]

    Publication Year: 1985 , Page(s): c4
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    Freely Available from IEEE
  • Electrooptic linear chirped grating lenses on planar optical Ti:LiNbO3waveguides

    Publication Year: 1985 , Page(s): 595 - 600
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1016 KB)  

    We report the experimental investigation of the first electrooptic chirped grating lenses (F/28 and F/56) on single-mode planar Ti-indiffused LiNbO3waveguides for TE and TM modes at 633 nm. These lenses perform simultaneously the basic functions of focusing, switching, and modulation of guided wave beams. View full abstract»

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  • Scattering characteristics in reheated fluorozirconate glasses

    Publication Year: 1985 , Page(s): 574 - 578
    Cited by:  Papers (4)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (712 KB)  

    The relation between the scattering intensity and reheating conditions in fluorozirconate glasses was studied precisely to clarify the effect of devitrification induced by fiber drawing using the preform method. The drawing-induced scattering is substantially caused by the nucleation of microcrystallites and begins to increase at a temperature lower than that predicted by DTA or DSC measurements. Nevertheless, it is revealed that ultralow-loss fluoride glass fibers can be drawn without excess loss increase by the perform method under optimized glass compositions and reheating conditions. View full abstract»

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  • Optical LAN activities in Europe

    Publication Year: 1985 , Page(s): 432 - 437
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (720 KB)  

    This paper provides an overview of European activities in the field of optical local-area networks (LAN's). The fully developed systems are currently at the process control and automation stage. Comparative estimates of the cost effectiveness of optical and electrical LAN's in industrial applications favor the optical systems. To date, deterministic protocols have predominately been used. Statistical access protocols are favored by Ethernet and are gaining in importance. Recent developments aim at mixed protocols which allow simultaneous transmission of both speech and data. The most important characteristics and results obtained with different optical LAN's are compared in a table. View full abstract»

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  • The fibernet II ethernet-compatible fiber optic LAN

    Publication Year: 1985 , Page(s): 496 - 501
    Cited by:  Papers (5)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (768 KB)  

    Fibernet II is a fiber-optic local area network (LAN) having an active-star configuration. It is plug compatible with the 10- Mbit/s coaxial-cable Ethernet LAN at its transceiver cable interface. Ethernet requires the detection of packet collisions; this function is implemented in Fibernet II at the active star node. Collision presence is signaled to the host transceivers with a unique in-band optical signal. Fibernet II features improved electromagnetic immunity, absence of signal radiation from cables, freedom from ground-loop currents due to ground potential differences between remote sites, new network topology options, and a growth path to future broad-band services. This paper describes the Fibernet II experimental system as implemented at the Xerox Palo Alto Research Center. A space-time analysis is presented which confirms that Fibernet II can support a network diameter of over 4.0 km, in contrast to the coax Ethernet which is limited to 2.5 km. View full abstract»

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  • Mode power partition events in nearly single-frequency lasers

    Publication Year: 1985 , Page(s): 706 - 712
    Cited by:  Papers (32)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (816 KB)  

    Frequent power dropouts are observed in the single dominant line of a number of dc-biased 1.3-μm injection lasers, each of which exhibits a nearly single-longitudinal-mode CW spectrum. During the dropout events, some of which essentially extinguish the dominant line for 1 to 8 ns, total laser output power is observed to remain constant: the power lost from the dominant mode appears in a side mode of very low average power. These events are capable of causing bit errors in a communications system. It was found that the frequency of events greater than a given threshold value falls exponentially with an increasing ratio of main-to-side-mode powers and that this ratio must exceed 100:1 in order to avoid a significant contribution to system error rates when the laser is operated continuously and an external modulator is used. These observations are in agreement with recently published calculations. The requirements on mode power ratio for the case of directly modulated lasers are much more severe. We present a calculation of the optical power penalty resulting from these mode power fluctuations. View full abstract»

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  • Small loss-deviation tapered fiber star coupler for LAN

    Publication Year: 1985 , Page(s): 556 - 560
    Cited by:  Papers (2)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (536 KB)  

    A biconical tapered-fiber star coupler with a mixer rod was proposed to achieve small loss-deviation and low-excess loss. Design and fabrication techniques for this star coupler were minutely discussed, and a 100 × 100 star coupler was experimentally fabricated. The loss-deviation and average-excess loss for this star coupler was 0.37 and 3.2 dB, respectively. View full abstract»

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  • Refractive-index profile and modal dispersion prediction for a single-mode optical waveguide from its far-field radiation pattern

    Publication Year: 1985 , Page(s): 628 - 634
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (800 KB)  

    Refractive-index profile and modal dispersion in single-mode optical fibers are computed from the measured far-field exit radiation pattern of the fundamental mode. Instead of Fourier transforming the far-field numerically, the near-field is calculated by fitting a series of Gauss-Laguerre functions to the far-field. The coefficients of the series are simply found by matrix inversion and determine directly the refractive-index profile and the modal dispersion within the framework of a scalar theory. The main advantage of the proposed method lies in its inherent insensitivity against random measurement errors. Further possible applications (determination of cutoff wavelength, near-field and refractive-index profile of integrated-optical waveguides with rectangular cross section) are briefly discussed. View full abstract»

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  • Launching condition dependence of bandwidth in graded-index multimode fibers fabricated by MCVD or VAD method

    Publication Year: 1985 , Page(s): 601 - 607
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (656 KB)  

    Baseband frequency response of a single or concatenated MCVD and VAD fibers measured by two representative launching conditions-equilibrium mode distribution (EMD) and overfill mode distribution (OMD)-is studied. From computations based on the WKB approximation method and from experiments, it is found that the OMD exciter on the average results in a greater 6-dB bandwidth than the EMD exciter for a single MCVD fiber, but is does a smaller bandwidth for a single VAD fiber. On the other hand, in concatenated fibers, the EMD exciter results in a greater bandwidth of about 10 percent in comparison with the OMD exciter. The concatenation factors for MCVD fiber and VAD fiber are different for EMD excitation, while they are nearly identical with each other for OMD excitation. View full abstract»

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  • Radiation from a periodically bent dielectric cylinder with a graded-index profile

    Publication Year: 1985 , Page(s): 713 - 724
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1008 KB)  

    The scattering of guided modes on a dielectric cylinder is investigated for periodically bent cylinders. The graded-index cylinders, in which the relative permittivity changes along the cylinder radius, are treated. Analytical expressions for the amplitude and phase variations of the radiation cylindrical waves are found in a uniform and self-consistent way. Fibers with arbitrary values of the core and cladding index of refraction have been investigated. The general analysis of periodic and nonperiodic deformations of small amplitudes are presented and the special cases of sinusoidally and helically bent fibers, having parabolic index profiles, are considered in detail. The two types of fiber perturbations yield similar characteristics with more radiation losses resulting from a helically bent fiber. A weak inhomogeneity of relative permittivity does not effect the characteristics significantly modifying the phase, but not the amplitude variations of interacting modes. The conversion between guided and radiation modes of different polarizations is stronger in cylinders of smaller radii. The higher order modes of a uniform cylinder are scattered stronger than the lower order modes, and the radiation losses decrease with the increasing cylinder radius. View full abstract»

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  • Nondegenerate solution of TE and TM modes in step-index fibers using power-series expansion method

    Publication Year: 1985 , Page(s): 612 - 618
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB)  

    The power-series expansion method has been used to compute the exact cutoff frequencies of TM modes in step-index fibers for various values of relative refractive index difference (Δ), ranging from 0.005 to 0.1. The difference between the propagation constants of TM and TE modes, intermodal delay between TM and TE modes, and their variation with respect to the relative refractive-index difference has also been calculated. Numerical results show that for a fiber with \Delta = 0.005 the intermodal delay between TM01and TE01modes is of the order of 1.5 ps/km at frequencies far away from cutoff, whereas it is of the order of 0.62 ns/km for \Delta = 0.1 . View full abstract»

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  • Fiber-optic devices for local area network application

    Publication Year: 1985 , Page(s): 544 - 555
    Cited by:  Papers (6)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1552 KB)  

    Recent developments on fiber-optic devices are reviewed from the local area network (LAN) application viewpoint. Future technical trends are also discussed, along with current research activities. In local area network systems, low device cost and easy maintenance or maintenance-free devices are especially required. Light sources and photodetectors suitable for the systems are described. InGaAsP/InP light emitting diodes can cover a broad application field, up to a gigabits per second super high-speed network region. Optical passive devices, which include branching couplers, switches and connectors, are mentioned as essential components. Compact transmitter/receiver module technology is a key factor in realizing optical-fiber local area network systems. An example of 200-Mbit/s transmitter/receiver module is reported. View full abstract»

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  • Single and multimode fiber bandwidth measurements with single and multilongitudinal mode lasers operating at 0.8-, 1.3-, and 1.5-µm wavelength

    Publication Year: 1985 , Page(s): 695 - 698
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    The bandwidth characteristics of single and multimode optical fibers have been investigated with single and multilongitudinal mode laser sources operating at 0.8, 1.3, and 1.5 μm. It is shown that single-mode fiber with a cutoff wavelength of 1.3 μm can support 1 Gb/s transmission over at least 7.5 km with a 0.8-μm laser source. View full abstract»

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  • Optical fiber transmission systems using stimulated Raman scattering: Theory

    Publication Year: 1985 , Page(s): 688 - 694
    Cited by:  Papers (13)  |  Patents (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    Forward and backward stimulated Raman scattering is theoretically discussed. For forward stimulated Raman scattering, the discussion is made taking account of the pump depletion due to the stimulated Raman scattering process. On the basis of the results, the optical transmission systems using stimulated Raman scattering are discussed and the possibility of repeater spacing more than 400 km is presented. View full abstract»

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  • Increased power injection in multimode optical-fiber buses through mode-selective coupling

    Publication Year: 1985 , Page(s): 537 - 543
    Cited by:  Papers (4)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (752 KB)  

    The number of stations that can be put on an optical-fiber data bus is usually limited by the total allowable attenuation between transmitter and receiver. A fundamental assumption in local-area network designs has been that a passive bus coupler must remove from the bus the same fraction of optical power that it injects from the local transmitter. This mandates very inefficient power injection to the bus and limits the total number of stations that can be put on the bus. By considering mode-selective passive optical couplers, I show that this limitation can be overcome in principle, and practically all the local power can be injected. Calculations indicate that this can lead to an increase in injected power of around 7 dB, and an almost doubling of the number of possible stations on the bus. View full abstract»

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Aims & Scope

The Journal of Lightwave Technology contains articles on current research, applications and methods used in lightwave technology and fiber optics.

Full Aims & Scope

Meet Our Editors

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