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Lightwave Technology, Journal of

Issue 1 • Date Jan 1990

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Displaying Results 1 - 18 of 18
  • The performance of a traveling-wave-type semiconductor laser amplifier as a booster in multiwavelength simultaneous amplification

    Publication Year: 1990 , Page(s): 105 - 112
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB)  

    In this study, the theoretical worst and the average interchannel crosstalk are shown as a function of normalized input power. The validity of normalization by saturation input power is confirmed by experimental data. This normalized input power must be set below -20 and -10 dB for multiwavelength numbers of 20 and 4, respectively, to attain an average interchannel crosstalk of under -10 dB. The optical loss, including interchannel crosstalk, that can be compensated by a traveling-wave-type semiconductor laser amplifier (TWA) is analyzed. The experimental results indicate that the compensable optical loss could be evaluated by using the average interchannel crosstalk in multiwavelength transmission system design. Applying a TWA as a preamplifier is more effective in systems that include excess optical loss in the receiver View full abstract»

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  • Low-reflectivity in-line variable attenuator utilizing optical fiber tapers

    Publication Year: 1990 , Page(s): 7 - 10
    Cited by:  Papers (6)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (388 KB)  

    A single-mode inline variable optical attenuator utilizing optical fiber tapers is discussed. Optical attenuation control is achieved through axial separation between two tapers with beveled endfaces aligned within a ceramic sleeve. Increased axial separation causes increased coupling loss between the two taper fundamental modes. Insertion loss of <0.5 dB, attenuation of >75 dB with continuous 0.05 dB resolution, and reflection return loss of better than 58 dB have been realized. Theoretical studies indicate low polarization and wavelength dependence, and inherent insertion loss of <0.1 dB. This design also exhibits simplicity of fabrication View full abstract»

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  • Spectral index method for polarized modes in semiconductor rib waveguides

    Publication Year: 1990 , Page(s): 113 - 117
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    A fast way of modeling polarized modes in semiconductor rib waveguides is presented and shown to be in excellent agreement with a semivectorial finite-difference computer program. The method uses little storage and has been implemented on a personal computer View full abstract»

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  • Statistical dispersion budgeting method for single-mode fiber transmission systems

    Publication Year: 1990 , Page(s): 11 - 15
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (416 KB)  

    A statistical dispersion budgeting method for spliced single-mode fiber transmission spans is proposed. The method aids in the design of fiber spans in high bit-rate (>1 Gb/s) systems. Intended for spans containing many splices, the method yields, in theory, greater span lengths than those calculated with the traditional worst-case dispersion budgeting method View full abstract»

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  • A new semirigorous analysis of rib waveguides

    Publication Year: 1990 , Page(s): 56 - 65
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (796 KB)  

    A semirigorous analysis of rib waveguides embedded in air is proposed. The analysis is based upon a scalar analysis and two different vectorial correction schemes, through either a perturbation formula or a scalar calculation with modified effective dimensions. The scalar field is computed with a very efficient spectral technique. The method converges rapidly, and it compares favorably with recent work on rib waveguides. It can be extended to other planar structures, such as ridge waveguides View full abstract»

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  • Analysis of the coupling characteristics of a tapered coupled waveguide system

    Publication Year: 1990 , Page(s): 90 - 98
    Cited by:  Papers (9)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (784 KB)  

    Optical coupling characteristics between one uniform waveguide and one tapered waveguide are discussed. This coupling structure is analyzed by utilizing coupled-mode theory and system step approximation. Based on numerical investigation, various coupling characteristics are presented. It is shown that the proposed structure can be used as a waveguide-type optical power divider by selecting an appropriate taper slope for the tapered waveguide or by separating the coupled waveguides properly for a desired power-dividing ratio View full abstract»

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  • Heterodyne ASK multiport optical receivers using postdetection filtering

    Publication Year: 1990 , Page(s): 71 - 77
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (500 KB)  

    A theoretical model for heterodyne amplitude-shift-keying (ASK) multiport optical receivers is presented. It applies when the transmitter and local oscillator have significant linewidths. The modeled receiver uses square law detection and postdetection filtering. The model allows for the essentially non-Gaussian character of the probability density function of the noise process at the input of the threshold comparator. Numerical computations are made for the {2×2} multiport receiver. They show that such a receiver can handle laser linewidths on the order of the bit rate with 1.5-dB loss as compared to the ideal heterodyne receiver with zero linewidth View full abstract»

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  • Perturbation effects on mode propagation in highly elliptical core two-mode fibers

    Publication Year: 1990 , Page(s): 23 - 33
    Cited by:  Papers (34)  |  Patents (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (960 KB)  

    The propagation of both fundamental and second-order modes in highly elliptical core two-mode fibers under external perturbations is investigated. Theoretical and experimental results are presented for the differential phase shift between two spatial modes in each eigenpolarization and the polarization behavior of each spatial mode. The perturbations include axial strain, radial strain, hydrostatic strain, temperature change, twisting, squeezing, and bending. An application of the modal behavior of these fibers to simultaneous measurement of strain and temperature is described View full abstract»

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  • A small-size polarization splitter based on a planar optical phased array

    Publication Year: 1990 , Page(s): 118 - 124
    Cited by:  Papers (4)  |  Patents (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (676 KB)  

    A device is proposed in which the dispersive properties of an array of bent optical waveguides are utilized for splitting the two polarizations present in the input waveguide. An experimental device for operation at a 633-μm wavelength, with dimensions of 0.6×2.5 mm 2, was designed and fabricated using conventional (high-quality) optical lithography. Insertion losses as low as 0.5 dB and far-end crosstalk values of 17-21 dB have been achieved View full abstract»

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  • Monolithic integration of an ARROW-type demultiplexer and photodetector in the shorter wavelength region

    Publication Year: 1990 , Page(s): 99 - 104
    Cited by:  Papers (16)  |  Patents (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (572 KB)  

    A monolithic integration of an antiresonant reflecting optical waveguide (ARROW)-type demultiplexer and photodetector is discussed. The isolation was theoretically calculated to be -21.6 dB between the wavelengths of 0.78 and 0.88 μm, with a maximum detecting efficiency of 58% in a short demultiplexing/photodetecting length of 100 μm. The fundamental characteristic was demonstrated experimentally. This type of device can be applied to a wavelength division multiplexing (WDM) system with comparatively wide wavelength separation, e.g. 1.3- and 1.55-μm wavelengths View full abstract»

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  • Quasi-static analysis of electrooptic modulators by the method of lines

    Publication Year: 1990 , Page(s): 42 - 50
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (664 KB)  

    A quasi-TEM analysis using the method of lines is implemented to calculate the electric field anywhere within a layered guided wave structure at appropriately low frequencies. The analysis provides the electric fields and transmission-line parameters for a shielded structure having any number of coplanar electrodes within an arbitrary number of anisotropic dielectric layers, the principal axes of which are parallel to the axes of the structure. The practical application considered is the calculation of the phase shift of a guided optical wave within an electrooptic modulator that has a dielectric buffer layer between the electrodes and electrooptic substrate View full abstract»

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  • Phase-induced intensity noise in optical interferometers excited by semiconductor lasers with non-Lorentzian lineshapes

    Publication Year: 1990 , Page(s): 1 - 6
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (436 KB)  

    Previously obtained results for the covariance, power spectrum, and variance of the phase-induced intensity noise (PIIN) at the output of optical systems with multiple paths are modified to include the effect of non-Lorentzian source lineshapes. In the coherent limit (delay≪source coherence time), the source relaxation oscillations significantly change the spectral shape of the PIIN at the output of such multiple-path architectures View full abstract»

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  • Self-aligned chemically assisted ion-beam-etched GaAs/(Al,Ga)As turning mirrors for photonic applications

    Publication Year: 1990 , Page(s): 39 - 41
    Cited by:  Papers (13)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    It is shown that totally reflecting turning mirrors can be fabricated in GaAs/(Al,Ga)As graded-index separate-confinement-heterostructure single-quantum-well (GRIN-SCH SQW) material using Ti metal masking and Cl2 chemically assisted ion-beam-etching (CAIBE). Combined with ridge waveguides, these techniques have been used to make turning-mirror cleaved-facet lasers that have acceptable external slope efficiencies with a modest estimated increase in threshold current. Scanning electron microscope examination of the mirrors indicates some residual roughness attributed to the edge definition of the deposited titanium film. The mirror loss is estimated to be 68% for these particular turning mirrors. These components, which continue to be developed and improved, are being applied to increasingly sophisticated and demanding photonic programs View full abstract»

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  • Theoretical analysis of the minimization of the temperature sensitivity of a coated optical fiber in a fiber-optic polarimeter

    Publication Year: 1990 , Page(s): 51 - 55
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    Closed-form solutions are used to analyze the effects of low-frequency temperature changes on coated optical fiber in a polarimeter. It is shown that coating the optical fiber with certain materials to an appropriate thickness can, theoretically, produce a zero temperature sensitivity View full abstract»

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  • RATO-net: a random-access protocol for unidirectional ultra-high-speed optical fiber network

    Publication Year: 1990 , Page(s): 78 - 89
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (952 KB)  

    The local network medium is a pair of unidirectional fiber optic buses to which stations are connected via passive taps. For this configuration, a random-access protocol called RATO (random-access time-out) is presented. RATO provides random access, fairness, and bounded delay access to all stations, and is particularly suited for ultra-high-speed transmission when the performance of the popular Ethernet becomes unattractive. Simplicity and ease of hardware implementation of RATO under ultra-high-speed environment is emphasized because the only control requirements are the sensing of activity in the bus and a fixed time delay between consecutive transmissions from the same station. Results of simulation and performance comparisons of RATO with other schemes are given. In ultra-high-speed wide-area networks, RATO outperforms all these other schemes View full abstract»

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  • Design of a mode filter consisting of two dual-mode highly elliptical-core fibers

    Publication Year: 1990 , Page(s): 34 - 38
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (444 KB)  

    Coupling characteristics of directional couplers consisting of two dual-mode highly elliptical-core fibers have been studied in detail using a first-order perturbation approach, and two different designs of a mode filter are proposed. The study shows that the fibers should be polished normal to the minor axis of the core ellipse if the first design principle is used, whereas they should be polished normal to the major axis if the second design principle is used. It is also observed that the latter design is much easier to realize in practice View full abstract»

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  • Electromagnetic fields in circular bends of slab waveguides

    Publication Year: 1990 , Page(s): 16 - 22
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    A rigorous theory for analysis of radiation and transmission of electromagnetic waves in uniformly curved sections of slab waveguides is presented. Eigenmodes with continuous eigenvalues are defined for the sectorial region, which includes the circularly bent section of slab waveguides. General fields in the sectorial region can be expanded in terms of these eigenmodes. The theory is applied to the analysis of transient fields in the circularly bent section of a slab waveguide connected to a straight section. Numerical examples of radiation patterns and field distributions are presented for the TE0-mode incident from the straight section View full abstract»

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  • Theory of direct frequency modulation of semiconductor lasers with integrated external cavity

    Publication Year: 1990 , Page(s): 66 - 70
    Cited by:  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (404 KB)  

    Numerical calculations of the frequency modulation responses of monolithically integrated external-cavity semiconductor lasers are performed using G.P. Agrawal's (J. Appl. Phys., vol.56, p.3110-15, 1984) two-section model. Theoretical results show good agreement with the reported experimental results. The comparison of the modulation responses of the solitary semiconductor laser diodes, the conventional external-cavity semiconductor lasers, and the integrated passive external-cavity semiconductor lasers demonstrates that the integrated external-cavity semiconductor laser is the best choice for use in direct frequency modulation 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