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Lightwave Technology, Journal of

Issue 6 • Date June 1986

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Displaying Results 1 - 24 of 24
  • [Front cover and table of contents]

    Publication Year: 1986 , Page(s): 0
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    Freely Available from IEEE
  • Reply by S. G. Gedam and S. S. Mitra

    Publication Year: 1986 , Page(s): 694
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  • Comments on "Nondegenerate solution of TE and TM modes in step-index fibers using power-series expansion method"

    Publication Year: 1986 , Page(s): 694
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  • Erratum: "Speckle interferometry for spectral analysis of laser sources and multimode optical waveguides"

    Publication Year: 1986 , Page(s): 694
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  • [Back cover]

    Publication Year: 1986 , Page(s): c4
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    Freely Available from IEEE
  • High-temperature stability of optical transmission properties attained by liquid-crystal polymer jacket

    Publication Year: 1986 , Page(s): 614 - 618
    Cited by:  Patents (1)
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    Liquid crystal polyester (LCP) tight jackets, developed as secondary coatings on optical fibers, exhibit Young's moduli of 10-20 GPa and linear expansion coefficients on the order of 10-6/°C. Because of their low linear expansion coefficients, and because they exhibit no thermal shrinkage, the LCP jackets cause a slight change in fiber strain on the order of 10-4percent/°C, or a change in the thermal coefficients of the transit time delay as low as 14-29 ps/km°C in an 80 to -60°C temperature range for tight-jacketed optical fibers. Furthermore, the LCP tight-jacketed optical fibers exhibit no excess loss in this temperature range. View full abstract»

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  • Probability of modal noise in single-mode lightguide systems

    Publication Year: 1986 , Page(s): 652 - 655
    Cited by:  Papers (4)
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    The probability of introducing modal noise in a single-mode lightguide system with a short length of straight depressed-cladding fiber between high-loss splices is investigated. The cumulative probability of modal noise is useful for evaluating the risk involved in violating the fiber minimum splicing length (the fiber length for zero probability of modal noise). The probability of encountering modal noise is less than 0.6 percent for fiber lengths as short as 3 m with splice losses of 0.5 dB. For this example, the minimum laser wavelength is 1285 nm and the maximum cutoff wavelength is 1330 nm measured on a 5-m length of fiber with 50-cm diameter loops. The results are also valid for depressed-cladding fiber measured by CCITT recommendations. View full abstract»

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  • Kerr effect in an optical passive ring-resonator gyro

    Publication Year: 1986 , Page(s): 645 - 651
    Cited by:  Papers (15)  |  Patents (2)
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    The Kerr effect in an optical passive ring-resonator gyro (OPRG) is analyzed considering the optical source coherence. This effect causes the drift to be much greater than the theoretical limit of rotation sensing given by the detector shot noise for an OPRG with high sensitivity. The drift depends not only on the fluctuation of the power splitting ratio between two counter-propagating beams in the resonator, but also on the frequency modulation indices used to set the operating point. Square-wave intensity modulation of the incident beam is also discussed as a way to eliminate the drift. It is found that the ratio of the signal-beam round-trip time in the resonator to the modulation period must be an integer to optimize the drift elimination. From the practical viewpoint, the requirement for the modulation parameters is analyzed numerically. View full abstract»

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  • Vectorial wave analysis of dielectric waveguides for optical-integrated circuits using equivalent network approach

    Publication Year: 1986 , Page(s): 656 - 664
    Cited by:  Papers (12)
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    A vectorial wave analysis of the propagation characteristics of open dielectric waveguides for optical-integrated circuits using an equivalent network approach is presented. In this approach, all of the contributions from the discrete and continuous parts of the spectrum and from the TE-TM coupling, which are neglected in the earlier equivalent network approach, are taken into account. To show the validity and usefulness of this formulation, examples are computed for optical strip waveguides, rib waveguides, rectangular dielectric waveguides, embossed waveguides, and embedded waveguides. View full abstract»

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  • Stress-induced birefringence of side-tunnel type polarization-maintaining fibers

    Publication Year: 1986 , Page(s): 601 - 607
    Cited by:  Papers (6)
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    Stress-induced birefringence of side-tunnel type polarization-maintaining optical fibers is presented. After checking the accuracy of finite-element calculations, the thermal stress analyses of various side-tunnel fibers are performed and the relation between the fiber parameters and the stress-induced birefringence is systematically investigated compared with the geometrical birefringence. As a result, it is found that for some cross-sectional shape, the stress-induced birefringence is more dominant than the geometrical one even in the side-tunnel fibers. We also investigate in detail the axial refractive-index and the axial stress of the fiber and compare them with those of ordinary step-index circular fibers. View full abstract»

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  • The effect of spurious intensity modulation in semiconductor diode lasers on the performance of optical heterodyne frequency shift-keyed communications systems

    Publication Year: 1986 , Page(s): 590 - 595
    Cited by:  Papers (4)
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    Analytical expressions are derived for the bit-error rate (BER) of an M -ary frequency shift-keyed (FSK), heterodyne, optical communication system with noncoherent demodulation in the presence of spurious intensity modulation (SIM) and frequency noise. The SIM degradation of an FSK system, implemented with semiconductor diode lasers, is estimated for lasers with zero and nonzero linewidths and will be discussed for a distributed feedback laser operating at 1.5μm and a channeled substrate planer laser operating at 0.83 μm. The SIM power penalty is typically less than 1 dB, but can exceed 1 dB for 2-, 4-, and 8-ary FSK at data rates above 1 Gbit/s. View full abstract»

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  • Combined numerical and analytical method of calculating microbending losses in single-mode fibers with arbitrary index profiles

    Publication Year: 1986 , Page(s): 596 - 600
    Cited by:  Papers (1)  |  Patents (3)
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    Using a multilayer approximation of the index distribution, analytical solutions of the microbending losses according to Petermann's approach for single-mode fibers with arbitrary index profiles can be derived. It is shown that less than 20 layers are required to ensure satisfying accuracy for graded-index single-mode fibers. For single-cladded fibers, simple profile-independent formulas for the ω01and ω02spots sizes are presented. These make it possible from the Laplace spot size at the zero dispersion wavelength to derive the spectral microbending losses without knowing the index profile. View full abstract»

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  • Monolithic integration of laser diodes, photomonitors, and laser driving and monitoring circuits on a semi-insulating GaAs

    Publication Year: 1986 , Page(s): 574 - 582
    Cited by:  Papers (9)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1184 KB)  

    A monolithic optoelectronic-integrated circuit (OEIC) incorporating laser diodes, photomonitors, and laser driving and monitoring circuits has been fabricated on a semi-insulating GaAs substrate. The structure and circuit design considerations, the fabrication processes, and the static and dynamic characteristics of the device are described. The device has been successfully operated up to 2 Gbit/s. View full abstract»

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  • Measurement of mode partition in DFB lasers

    Publication Year: 1986 , Page(s): 672 - 679
    Cited by:  Papers (8)
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    Some DFB (distributed feedback) laser diodes have a satellite mode beside a main DFB mode even if FP modes are suppressed. In this paper, the mode partition noise is presented for several DFB lasers operating in multilongitudinal modes. The results show that under modulation at 140 Mbit/s, the mode partition coefficient k2of multimode DFB lasers is very small and at most 0.02 while that of FP lasers biased at the threshold level is 0.03 to 0.12. The numerical evaluation of the mode partition effect in two-mode DFB lasers suggests that a 20- dB suppression of the satellite mode power is enough to achieve a repeater spacing of over 100 km in the 280 Mbit/s fiber-optic transmission system with less than 0.1-dB power penalty. View full abstract»

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  • Optical design and performance of wavelength-division-multiplexed optical repeater for fiber-optic passive star networks connection

    Publication Year: 1986 , Page(s): 665 - 671
    Cited by:  Papers (3)  |  Patents (2)
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    New optical repeaters that use a wavelength-division-multiplexing (WDM) technique to connect CSMA/CD-based fiber-optic passive star networks are discussed. Two types of optical filters that are essential for obviation of closed-loop formation in construction of such repeaters, have been designed and fabricated. Results of a field trial of the filters and optical modules using the filters show good agreement with design values. The repeaters were also found to operate reliably. View full abstract»

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  • Compact transmitter and receiver modules with optoelectronic-integrated circuits for optical LAN's

    Publication Year: 1986 , Page(s): 680 - 688
    Cited by:  Papers (11)  |  Patents (1)
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    Compact transmitter and receiver modules with monolithic optoelectronic-integrated circuits, i.e., OEIC's, are demonstrated, and 400- and 800-Mbit/s transmission experiments are successfully carried out over up to 4 and 2 km, respectively, with these modules, for the first time. The design of the monolithic-integrated circuits and the compact module structure are presented. The soldering technique based on the use of YAG laser simplifies the packaging procedures, and an efficient and simple scheme for coupling between OEIC's and fibers make the OEIC modules compact. Both modules are attractive for applications in high data-rate communication systems, particularly in local area networks, CATV systems, and intra-office links. View full abstract»

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  • Configuration of the optical transmission line using stimulated Raman scattering for signal light amplification

    Publication Year: 1986 , Page(s): 569 - 573
    Cited by:  Papers (6)  |  Patents (1)
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    Expansion of a repeater spacing of optical transmission line is investigated using forward stimulated Raman scattering generated by a 1.34-μm Nd:YAG laser to amplify the signal light. Achievable repeater spacing at the 1.42-μm wavelength transmission is numerically estimated on the basis of coupled power equations and experimentally obtained Raman gain for various core-cladding index difference. A transmission distance of more than 200 km is predicted for an input signal light power of 100 μw and a pump power of 200 mW using a fiber with a relative index difference of 1 percent. View full abstract»

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  • Loss mechanisms in single-mode fiber tapers

    Publication Year: 1986 , Page(s): 608 - 613
    Cited by:  Papers (5)
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    The onset of transmission loss in four single-mode tapers is shown to coincide with the taper slope exceeding the critical slope angle at which fundamental mode cutoff occurs. This implies that the primary loss mechanism in single-mode fiber tapers is cutoff of the fundamental mode from the core. A secondary loss mechanism of coupling to the modes of a coaxial outer waveguide is also observed and modeled. Implications for fused fiber couplers are discussed. View full abstract»

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  • Current sensing utilizing heterodyne detection of the Faraday effect in single-mode optical fiber

    Publication Year: 1986 , Page(s): 640 - 644
    Cited by:  Papers (5)
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    A fiber-optic current sensor based on the Faraday effect is described which utilizes laser-diode frequency modulation in order to synthesize a heterodyne-type sensor output. The relative phase of the output carrier is directly modulated by the magnetically induced circular polarization mode-phase delay. Current sensing over three orders of magnitude is demonstrated, and a Verdet constant of 2.57 \times 10^{-6} rad/A (at 0.83μm) is reported for the fiber used. View full abstract»

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  • A 4-wavelength optical multi/demultiplexer for WDM subscriber loop systems using analog baseband video transmission

    Publication Year: 1986 , Page(s): 631 - 639
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1056 KB)  

    This paper describes the design principles and performance of optical multi/demultiplexers (MUX/DEMUX's) in wavelength-division multiplexing (WDM) subscriber-loop systems over a 50- μm core diameter, graded-index (GI), multimode fiber, which employ analog baseband video transmission using laser diodes (LD's). In this WDM arrangement, requirements for MUX/DEMUX's are: 1) low insertion loss; 2) no signal degradation caused by optical interchannel crosstalk; 3) only a small amount of analog baseband signal degradation caused by the use of MUX/DEMUX; 4) a small size and simple structure capable of multiplexing three or four wavelengths; and 5) good stability. The newly developed 4-wavelength MUX/DEMUX satisfies the preceding requirements and is suitable for application to WDM subscriber-loop systems using analog baseband signals along with digital signals. View full abstract»

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  • Theory of signal light amplification by stimulated Raman scattering in twisted single-mode optical fibers

    Publication Year: 1986 , Page(s): 583 - 589
    Cited by:  Papers (3)
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    Characteristics of signal light amplification by stimulated Raman scattering are studied theoretically for the twisted single-mode fibers. Coupling equations for orthogonal modes in the fiber are derived and solved analytically. The optical gain dependence on fiber twist rate, fiber length, and so on are numerically investigated. The Raman gain for the twisted fiber with a rate of 1 turn/m is found to be reduced by 10 dB comparing with the nontwisted fiber for the fiber length less than 2 km, while it is almost independent of twist rate for the fiber longer than 10 km. View full abstract»

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  • LP modes and ideal modes on optical fibers

    Publication Year: 1986 , Page(s): 626 - 630
    Cited by:  Papers (6)
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    The transformation from coupled-mode equations for LP modes to those for ideal modes and the expressions of one set of modes in terms of linear combinations of the other set of modes are studied, using the coupled-mode theory. The expressions (including higher-order corrections) of modal fields and propagation constants for ideal modes are given in terms of those for LP modes in three different cases. Thus, cases where a LP mode can or cannot directly replace a corresponding ideal mode are made clear. View full abstract»

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  • Coupled-mode theory for LP modes

    Publication Year: 1986 , Page(s): 619 - 625
    Cited by:  Papers (8)
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    A generalized definition of LP modes is introduced for an optical fiber with arbitrary refractive-index profile and arbitrary cross section, The orthogonality property of these LP modes has been considered. Based on a complete set of LP modes in a chosen reference fiber, a set of coupled-mode equations describing a practical fiber are established. Possible applications of these coupled-mode equations are demonstrated. View full abstract»

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  • Calculation of metal-clad ridge-waveguide (MCRW) laser modes by mode coupling technique

    Publication Year: 1986 , Page(s): 689 - 693
    Cited by:  Papers (3)  |  Patents (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (592 KB)  

    The waveguide modes of metal-clad ridge-waveguide (MCRW) lasers are calculated rigorously by way of laterally coupled-mode equations. Thereby propagation constants of the waveguide modes are computed and compared to an approximate theory. Taking into account the complete set of local TE- and TM-eigenmodes, our analysis reveals that MCRW laser modes are mainly TE-polarized with a TM-component of some percent in case of narrow stripe lasers and it is shown that for strong lateral discontinuity of the waveguide geometry radiation losses appear owing to excitation of leaky TM-modes. Furthermore, modes losses caused by metal absorption are investigated and found to be in the order of 10 cm-1for highly conductive metallizations. 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.

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Meet Our Editors

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