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Lightwave Technology, Journal of

Issue 7 • Date July 1986

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Displaying Results 1 - 25 of 53
  • [Front cover and table of contents]

    Publication Year: 1986 , Page(s): 0
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    Freely Available from IEEE
  • Foreword

    Publication Year: 1986 , Page(s): 697 - 698
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  • Optical communication: The doorway to the information era

    Publication Year: 1986 , Page(s): 699 - 705
    Cited by:  Papers (2)
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  • Correction to "Reduction of lasing threshold current density by the lowering of valence band effective mass"

    Publication Year: 1986 , Page(s): 961
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  • [Back cover]

    Publication Year: 1986 , Page(s): c4
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    Freely Available from IEEE
  • Real-time heterodyne fiber polarimetry with narrow- and broad-band sources

    Publication Year: 1986 , Page(s): 877 - 883
    Cited by:  Papers (4)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1216 KB)  

    A fast heterodyne polarimeter for fiber characterization is presented. The measurement principle gives rise to two basic system versions, suitable for a wide range of experimental conditions. The first solution, useful in the case of narrow-band sources, is based on a self-heterodyne configuration. The second scheme, free from coherence requirements of the source, employs a Mach-Zehnder interferometric structure placed at the output of the fiber. Very good performances of both implementations are extensively demonstrated through different sets of results (in time and frequency domain) related to statical and dynamical fiber tests. Other relevant applications in telecommunication and sensor areas are discussed. View full abstract»

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  • Integrated optic temperature and humidity sensors

    Publication Year: 1986 , Page(s): 833 - 836
    Cited by:  Papers (3)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    Temperature sensor of the integrated optic structure was constructed using a Michelson interferometer configuration with an asymmetric X junction and a grooved reflector on a LiNbO3substrate. With this structure, larger difference in the optical paths lengths for two beams is provided to realize higher sensitivity. Also a humidity sensor of the optical guided-wave structure is proposed and its first known demonstration is reported. View full abstract»

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  • Analysis on splice, microbending, macrobending, and Rayleigh losses in GeO2-doped dispersion-shifted single-mode fibers

    Publication Year: 1986 , Page(s): 706 - 710
    Cited by:  Papers (3)  |  Patents (5)
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    Independent of the actual index profile of a single-cladded dispersion-shifted single-mode fiber, it is shown that the loss components given in the headline at the zero dispersion wavelength λ0accurately can be obtained by simple expressions that only depend on the Laplace spot size value at λ0. With \lambda _{0} = 1.55 \mu m, these relations are used to estimate and minimize the total loss in single-cladded dispersion-shifted fibers with arbitrary core-index profiles. View full abstract»

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  • Single-mode fiber WDM in the 1.2/1.3 µm wavelength region

    Publication Year: 1986 , Page(s): 841 - 845
    Cited by:  Papers (2)
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    The 1.2/1.3 \mu m band single-mode fiber WDM was developed with various factors such as characteristics, stability, and cost of the device in practical use taken into consideration. It uses ball-lens collimators in the optical coupling system. Utilizing its coupling characteristics could realize a low-loss high-stability WDM. An insertion loss variation is less than 0.25 dB throughout the wide temperature range of from -40°C to +70°C. View full abstract»

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  • Partition noise statistics for multimode lasers

    Publication Year: 1986 , Page(s): 948 - 950
    Cited by:  Papers (9)
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    Statistics of partition noise, including covariances between modes, have been measured for gain-guided lasers at 850 nm. The results are discussed in the light of theories of partition noise and their implications for practical systems are explained. View full abstract»

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  • Fluorine doping and etching reactions of freon 12 in optical fiber manufacture

    Publication Year: 1986 , Page(s): 746 - 750
    Cited by:  Papers (2)
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    The chemistry of reactions of CF2CI2used in optical fiber manufacture has been studied by infrared spectroscopy. Evidence is pesented to support a model of fluorine doping based on trichlorofluorosilane oxidation. Carbonyl fluoride has been identified as a major intermediate in the etching process. View full abstract»

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  • Tunable backscattering for single-mode optical fibers in 1.1-1.6-µm spectral region

    Publication Year: 1986 , Page(s): 884 - 888
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    A very powerful and versatile backscattering apparatus for single-mode fibers has been implemented, which can be tuned to almost every wavelength in the spectral region from 1.06 to 1.6 μm. A Raman source fiber, pumped by a Nd:YAG laser, is filtered by a special conception monochromator (folded path) which, by preserving the image of the output face of the source fiber, allows good launching efficiency into the fiber under test. Directional coupling with suppression of Fresnel reflection is achieved by an acoustooptic modulator, which is insensitive to polarization. Applications to single-mode fibers characterization are discussed, like spectral attenuation, cutoff phenomena as function of length and spot-size propagation. View full abstract»

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  • High-speed 1.3-µm LED transmitter using GaAs driver IC

    Publication Year: 1986 , Page(s): 790 - 794
    Cited by:  Papers (3)  |  Patents (1)
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    For an application to a high-speed LED driver, a shunt drive circuit which is eminently suitable for GaAs IC's has been developed. This circuit has been embodied in a monolithic GaAs IC. A compact hybrid IC of an LED transmitter, i.e., a combination of this GaAs IC and a high-speed LED, has been fabricated. A high bit rate (NRZ 4000 M bit/s) transmission was demonstrated by using this LED transmitter. View full abstract»

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  • Nonreciprocal propagation in magnetooptic YIG rib waveguides

    Publication Year: 1986 , Page(s): 711 - 714
    Cited by:  Papers (12)  |  Patents (1)
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    In this paper, we describe the experimental results on the nonreciprocal propagation in the magnetooptic YIG rib waveguides. First, we demonstrate the nonreciprocal phase shift in the straight waveguide, and next we confirm the nonreciprocal intensity propagation in the Mach-Zehnder interferometric waveguide with asymmetric arms. These are important for the construction of the differential phase shifter type nonreciprocal devices. View full abstract»

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  • Reliability of InGaAs/InP long-wavelength p-i-n photodiodes passivated with polyimide thin film

    Publication Year: 1986 , Page(s): 933 - 937
    Cited by:  Papers (12)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (504 KB)  

    The long-term reliability of InGaAs/InP p-i-n photodiodes passivated with polyimide thin film was studied through a room temperature life test and through thermally accelerated life tests. No degradation in dark current was observed in a room temperature life test at a reverse bias of -15 V after aging for 7000 h. However, the dark current increased gradually in the accelerated life tests at 110°C, 130°C, and 150°C. It was confirmed that the activation energy of degradation in dark current was 0.85 eV and the average lifetime was estimated to be 107h at room temperature. The dark current recovered in high temperature storage tests. The phenomenon of degradation and recovery was qualitatively explained by a model of accumulation and diffusion of mobile ions at a junction perimeter. View full abstract»

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  • TTOSS: An integrated subscriber system for direct and coherent detection

    Publication Year: 1986 , Page(s): 778 - 784
    Cited by:  Papers (3)
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    We present the results of an in-house demonstration of the Totally Transparent Optical Subscriber System (TTOSS) which shows that the system can be operated with present-day direct detection systems. In addition, we show that TTOSS can be gradually adapted for coherent system use without modifications to the permanently installed part of the system. View full abstract»

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  • Crystalline and optical quality of proton exchanged waveguides

    Publication Year: 1986 , Page(s): 743 - 745
    Cited by:  Papers (4)  |  Patents (1)
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    In this paper we demonstrate the possibility of obtaining high-quality proton-exchanged (PE) lithium niobate guides by performing the exchange at high temperatures (300°C) in benzoic acid diluted with lithium benzoate. Rutherford backscattering studies suggest that the higher exchange temperatures avoid the production of niobium dislocations, and, IR absorption measurements suggest that the use of lithium benzoate diluted melts prevents the creation of interstitial hydrogen. View full abstract»

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  • Cooling and bubble-free coating of optical fibers at a high drawing rate

    Publication Year: 1986 , Page(s): 739 - 742
    Cited by:  Papers (2)  |  Patents (9)
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    For economic reasons, the drawing rate of optical fibers should be as high as possible. However, a high drawing rate introduces problems with respect to on-line coating of the fiber such as insufficient cooling down of the fiber before coating and application of an absolutely bubble-free concentric coating layer. A cooling device and a force-feed coating applicator are described that enable proper coating of fibers at speeds of at least 700 m/min using a short drawing tower. View full abstract»

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  • Chirp in picosecond pulses from diode lasers: Dependence on the modulation conditions and linewidth enhancement factor

    Publication Year: 1986 , Page(s): 795 - 798
    Cited by:  Papers (5)
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    This paper reports on the first experimental study in the large-signal domain on the relation between the linewidth enhancement factor α and the frequency chirp of picosecond pulses from diode lasers. The time-bandwidth product is found to be constant over a wide range of operating conditions, in good agreement with theory. Different laser structures in the same material (GaAs) are shown to have significantly different chirp behavior and α parameters, thereby experimentally verifying the structural dependence of the α parameter. Simulations based on the standard rate-equations are also performed, and it is found that considerable chirp can be present even in pulses having time-bandwidth products less than one. View full abstract»

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  • Monolithically integrated high-speed light source using 1.3-µm wavelength DFB-DC-PBH laser

    Publication Year: 1986 , Page(s): 908 - 912
    Cited by:  Papers (8)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (616 KB)  

    The first monolithic high-speech light source, consisting of an InGaAsP/InP DFB laser, metal-insulator-semiconductor field-effect transistors, and a monitoring photodiode, has been fabricated. Small-signal modulation bandwidth up to 4 GHz was successfully achieved. The device design, fabrication procedures, and operating characteristics for the integrated light source are described. View full abstract»

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  • Transmission and signal processing techniques for gigabit lightwave systems

    Publication Year: 1986 , Page(s): 759 - 766
    Cited by:  Papers (5)
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    The technology of optical-fiber transmission systems has advanced rapidly within recent years; a number of laboratories having reported gigabit transmission over 100-km spans. These developments have placed increasing emphasis on the associated signal processing functions such as timing extraction and regeneration. This paper will review laser, fiber, and receiver requirements for high-speed systems and describe two recent lightwave transmission experiments featuring distributed feedback lasers, low-loss dispersion-shifted fiber, germanium avalanche photodiode receivers, and gallium arsenide logic devices. View full abstract»

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  • Fabrication and characterization of low-loss optical fibers containing rare-earth ions

    Publication Year: 1986 , Page(s): 870 - 876
    Cited by:  Papers (15)  |  Patents (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (816 KB)  

    Low-loss fibers containing rare-earths have been produced with high absorption levels in the visible and near infrared regions. Although containing relatively large quantities of rare-earth impurity dopants, the fibers possess low-loss windows where the attenuation is similar to that observed in undoped fibers. This attribute makes the fibers attractive for use in long distributed sensors, as well as low-threshold fiber lasers. Fiber characteristics relevant to these two applications are uniformity of dopant incorporation, absorption and fluorescence spectra, and fluorescence lifetime. These measurements are presented, together with their respective temperature dependences. The fiber fabrication method is described and results given for Nd3+-, Er3+-, and Tb3+-doped fibers. View full abstract»

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  • Fast curing primary buffer coatings for high strength optical fibers

    Publication Year: 1986 , Page(s): 938 - 941
    Cited by:  Papers (2)
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    UV-curable polyetherurethane acrylates and poly- (dimethyl-co-methylphenyl siloxane) acrylates have been investigated for the primary buffer coating of optical fibers. Curing behavior, Emodulus, glass transition temperature and refractive index have been studied in relation to the molecular structure of both acrylate types. The benefits of the appropriate composition with respect to fiber drawing speed and performance are ultrafast curing, low operation temperatures, and high mechanical stability. View full abstract»

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  • Self-amplitude modulation in PSK coherent optical transmission systems

    Publication Year: 1986 , Page(s): 900 - 904
    Cited by:  Papers (8)
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    Self-amplitude modulation due to group velocity dispersion (chromatic dispersion of an optical fiber) in phase-shift keying (PSK) coherent optical transmission systems is presented. It may place a serious limitation on performance of such systems by limiting the maximum transmission distance attainable at a given bit rate. The maximum transmission distance for any prescribed degree of self-amplitude modulation is derived for PSK coherent systems. The result shows that the distance over which appreciable amplitude modulation is impressed on a phase-modulated signal is considerably less than the dispersion-limited transmission distance for intensity modulated direct detection systems. View full abstract»

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  • Integrated optical parametric devices

    Publication Year: 1986 , Page(s): 772 - 777
    Cited by:  Papers (3)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (760 KB)  

    A short review of the development and the state of the art of integrated optical parametric devices for nonlinear optical frequency conversion is given. The special aspects for phase matching and field overlap in waveguide devices are discussed. Material systems used for second-order nonlinear effects are reviewed. Finally, resonant Ti:LiNbO3devices for second-harmonic generation and parametric oscillation are presented and discussed in more detail. 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