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Lightwave Technology, Journal of

Issue 4 • Date Apr 1992

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Displaying Results 1 - 19 of 19
  • Bias of an optical passive ring-resonator gyro caused by the misalignment of the polarization axis in the polarization-maintaining fiber resonator

    Publication Year: 1992 , Page(s): 514 - 522
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (720 KB)  

    An analysis is presented of the bias of an optical passive ring-resonator gyro caused by the misalignment of the polarization axis in the resonator formed by the polarization-maintaining fiber. A large bias takes place when the phase difference between the two polarization modes of the fiber is equal to the amount of 2π times an integer. It is clarified that the bias can be suppressed by setting the fiber polarizers at the lead portions of the resonator, which was a method proposed originally to reduce the bias in an ideal resonator without the misalignment View full abstract»

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  • Small signal analysis of optical FM signal amplification by an injection-locked type semiconductor laser amplifier

    Publication Year: 1992 , Page(s): 477 - 481
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (368 KB)  

    A small-signal analysis for optical FM signal amplification by an injection-locked type semiconductor laser amplifier with consideration of the spurious intensity modulation (SIM) is presented. In general, the performance of optical FM signal amplification by a laser amplifier is affected by the value of the injection power, by the performance of the injecting laser (the master laser), and by the difference between the emission frequencies of the master and slave optical cavities. In particular, when the modulation frequency is very low, the output frequency deviation (FD) of the laser amplifier turns out to coincide with that of the master laser. However, SIM of the laser amplifier in this case is influenced by the injection conditions. A suitable definition, the ratio of the output FD to SIM to the input FD to SIM, is given to evaluate the performance of an injection-locked-type semiconductor laser amplifier View full abstract»

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  • Optimal AR-coating for optical waveguide devices

    Publication Year: 1992 , Page(s): 469 - 476
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB)  

    The authors have calculated the optimal index of refraction and thickness of an antireflection coating layer for optical modes (TE/TM) in semiconductor laser devices. They have taken into account various correction factors concerning the two-dimensional carrier gas, i.e. the change in photonic energy depending on the width of the quantum well, the resulting change in refractive indexes, and the change in effective masses of the carriers. The value √neff*-n eff* is the effective optical mode index. It is compared to the exact calculated value for the optimal coating index View full abstract»

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  • Optimum Er3+-doped fiber amplifier design for optical AM video signal distribution systems

    Publication Year: 1992 , Page(s): 488 - 492
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (392 KB)  

    An investigation into the transmission characteristics of erbium-doped fiber amplifiers for use in optical AM frequency division multiplexing (FDM) video distribution systems is reported. The output signal power and noise characteristics of erbium-doped fibers were measured for different fiber lengths and different pump powers. The experimental results confirm that there exists an optimum amplifier design which gives the maximum distribution number when the pump power and the required video quality are given View full abstract»

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  • Why are accurate computations of mode fields in rectangular dielectric waveguides difficult?

    Publication Year: 1992 , Page(s): 418 - 419
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (172 KB)  

    The electric field of the modes of rectangular dielectric waveguides is known to diverge in the corners of the waveguide. An accurate numerical computation of the vector mode fields for a sample waveguide exhibits clear signs of this divergence. The divergence makes the design of rapidly converging numerical algorithms for vector mode field computations difficult View full abstract»

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  • Ultra-long distance wavelength-division-multiplexed soliton transmission using inhomogeneously broadened fiber amplifiers

    Publication Year: 1992 , Page(s): 482 - 487
    Cited by:  Papers (1)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB)  

    The use of inhomogeneously broadened amplifiers for wavelength-division-multiplexed (WDM) optical soliton transmission is proposed. Dynamic gain equalization can be achieved through saturation, by adjustment of the time-averaged intensity of control lasers tuned between the WDM channels. The authors investigate numerically an example in which seven WDM channels at 2 Gb/s each are equalized using parameter values reasonable for germanosilicate core erbium-doped fibers View full abstract»

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  • Nonlinear operations of 1.55-μm wavelength multielectrode distributed-feedback laser diodes and their applications for optical signal processing

    Publication Year: 1992 , Page(s): 448 - 457
    Cited by:  Papers (8)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (768 KB)  

    The nonlinear behavior of inhomogeneously excited 1.55-μm wavelength multielectrode distributed-feedback laser diodes, such as self pulsation and multistability for both injection current and for injection light, is described. Wavelength bistability is also described. Optical signal processing applications are experimentally demonstrated; they include optical logic circuits, optical memories, an optical demultiplexer, an optical timing extractor, and optical regenerative repeaters View full abstract»

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  • Comment, with reply, on article by Sennaroglu and Pollock (Unidirectional operation of rectangular dielectric single-mode ring waveguide lasers)

    Publication Year: 1992 , Page(s): 527 - 528
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (88 KB)  

    The commenters claim that energy is not conserved in an analysis of the unidirectional operation of a ring waveguide laser in a paper by A. Sennaroglu and C. R. Pollock (ibid., vol.9, no.9, p.1094-8, Sept. 1991). Sennaroglu and Pollack point out that the commenters completely ignored the boundary conditions on the tangential components of the magnetic fields at the interface View full abstract»

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  • Transient dynamics of stimulated Brillouin scattering in optical communication systems

    Publication Year: 1992 , Page(s): 493 - 502
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (740 KB)  

    Dynamic aspects of stimulated Brillouin scattering (SBS) and criteria for its occurrence in optical communications are studied numerically. SBS is shown to cause sharp amplitude modulations in phase-shift keying (PSK) modulated systems close to or above the SBS threshold. It is shown that the convolution method to high accuracy yields correct relative gains for different modulation sequences. The transient change of backscattered radiation caused by abrupt changes in the modulation format is studied and it is demonstrated that the transition can occur on different time scales View full abstract»

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  • Temperature dependence of index of refraction of polymeric waveguides

    Publication Year: 1992 , Page(s): 420 - 425
    Cited by:  Papers (9)  |  Patents (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (472 KB)  

    The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in NTE-NTM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced View full abstract»

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  • Mode structure and lateral confinement in strip-loaded optical waveguides: Effects of asymmetric cladding

    Publication Year: 1992 , Page(s): 426 - 431
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB)  

    Strip-loaded waveguides formed from three dielectric layers are used in integrated optics to confine and channel light in two dimensions. The numerical analysis reported shows that modal characteristics of such systems can be strongly affected by any differences between the refractive indexes of the upper and lower cladding. Asymmetries that tend to shift intensity toward the upper cladding generally act to tighten lateral confinement, introduce additional lateral modes, and displace the modes up into the strip. These effects are explained by noting the interplay of vertical and lateral confinement in a strip-loaded waveguide, and by analogy to one-dimensional slab waveguides View full abstract»

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  • Measurements and calculations of the LP01 intensity of SM fibers far off the core

    Publication Year: 1992 , Page(s): 407 - 412
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    Transverse offset measurements with a dynamic range of 106 were performed to determine the autocorrelation of the intensity as a function of the fiber's radial coordinate between 0 and 30 μm. Various matched-cladding, depressed-cladding, and dispersion-flattened single-mode fibers were investigated at wavelengths of 1150, 1300, and 1550 nm. The experimental results are compared to analytical approximations and numerical calculations. Satisfactory agreement for all types of fibers is found if the refractive-index profiles are evaluated carefully and if the wave equation is solved numerically. The results are useful for a realistic estimation of the influence of impurities and imperfections of the substrate tubes used for the plasma chemical vapor deposition (PCVD) process on the attenuation of the fibers View full abstract»

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  • Common path heterodyne optical fiber sensors

    Publication Year: 1992 , Page(s): 503 - 513
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (772 KB)  

    The common path type of differential heterodyne fiber-optic sensing scheme has been developed. It uses a polarization maintaining fiber as either a sensor or an optical lead and a dual-frequency dual-polarization laser beam. The sensing schemes are applied to the measurements of temperature, strain, force, pressure, rotation rate (gyro), magnetic and electric fields, and thin film thickness. The sensing scheme and main performances for each measurand are described. High precision and high stability as well as good linearity for each measurand are demonstrated View full abstract»

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  • Modal interference in a short fiber section: Fiber length, splice loss, cutoff, and wavelength dependences

    Publication Year: 1992 , Page(s): 401 - 406
    Cited by:  Papers (5)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (504 KB)  

    When a short fiber section is inserted within a fiber link, it is known that modal interference can create periodic oscillations in the wavelength dependence of the insertion loss and, accordingly, the insertion loss can exceed the sum of the interconnection losses (in decibels). This modal interference phenomenon is a potential cause of noise in telecommunications transmission systems. Experimental and theoretical investigations were performed in order to better understand its dependences on relevant fiber parameters and to generate engineering guidelines to minimize it in a telecommunication link View full abstract»

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  • Spectral properties of photocurrent fluctuations in avalanche photodiodes

    Publication Year: 1992 , Page(s): 458 - 468
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (800 KB)  

    The authors provide a stochastic model that describes the time dynamics of double-carrier multiplication in an avalanche photodiode (APD) and obtain the autocorrelation function and the spectral characteristics of the photoelectric current. The photoelectric pulse generated by an APD as a result of a single injected photoelectron is regarded as a nonstationary random function of time (the impulse response function). A discrete stochastic model for the electron-hole motion and multiplication is defined on a spatiotemporal lattice and used to derive recursive equations for the mean, the variance, and the autocorrelation of the impulse response as functions of time. Correlation properties of the impulse response are studied for a conventional and a multilayer (superlattice) APD. The power spectral density of the photocurrent is evaluated View full abstract»

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  • Material effects on phase sensitivity in polarimetric optical fiber sensors

    Publication Year: 1992 , Page(s): 523 - 526
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (296 KB)  

    The material effect on the phase sensitivity in polarimetric fiber sensors is considered using inhomogeneous stress analysis. It is found that both the Young's modulus and the Poisson's ratio of the stress-producing regions have a significant effect on the phase sensitivity. For the pressure, temperature, and strain sensors considered, it is found that the phase sensitivity has a strong linear dependence on the transverse optoelastic coefficient and a lesser nonlinear dependence on the Young's modulus of the core material. It is only possible to null the phase sensitivity to a particular measurand by adjusting the material coefficients in the stress-producing region but not in the core region View full abstract»

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  • An open-resonator model for the analysis of a short external-cavity laser diode and its application to the optical disk head

    Publication Year: 1992 , Page(s): 439 - 447
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (636 KB)  

    Based on the open resonator theory, a model of a complex coupling coefficient suitable for the analysis of an ultrashort external-cavity laser diode is presented. It is shown that the effective reflectivity of the short external-cavity laser diode calculated by using this model is a function of the size of the laser-emitting area and is significantly influenced by the phase-modification factor as well as by the amplitude-reduction factor of the complex coupling coefficient. The calculated output power characteristics show good qualitative agreement with experimental observation. The necessary condition that the optical disk head using an external-cavity laser diode does not fail to detect the recorded signal for a broad range of flying height is also derived View full abstract»

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  • The shape of fiber tapers

    Publication Year: 1992 , Page(s): 432 - 438
    Cited by:  Papers (72)  |  Patents (38)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (536 KB)  

    A model for the shape of optical fiber tapers, formed by stretching a fiber in a heat source of varying length, is presented. Simple assumptions avoid any need for the techniques of fluid mechanics. It is found that any decreasing shape of taper can be produced. The procedure for calculating the hot-zone length variation required to produce a given shape of taper is described, and is used to indicate how an optical adiabatic taper can be made. A traveling burner tapering system is capable of realizing the model's prediction, and a complete practical procedure for the formation of fiber tapers with any reasonable shape is thus presented View full abstract»

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  • Analytical solution of stresses and material birefringence in optical fibers with noncircular cladding

    Publication Year: 1992 , Page(s): 413 - 417
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB)  

    An analytical method for the calculation of thermal stress in polarization-maintaining optical fibers is presented. The method is based on the thermoelastic potential and is appropriate for structures with a noncircular stress-cladding boundary. The analytical solution is compared with the results of the finite element method (FEM) for the case of an elliptical boundary 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