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Lightwave Technology, Journal of

Issue 12 • Date Dec. 1995

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Displaying Results 1 - 14 of 14
  • Correction to "Scalling and antenna gain in integrating fiber-optic sensors"

    Publication Year: 1995 , Page(s): 2378
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    First Page of the Article
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  • Author Index

    Publication Year: 1995 , Page(s): 2379 - 2389
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    Freely Available from IEEE
  • Subject index

    Publication Year: 1995 , Page(s): 2389 - 2421
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    Freely Available from IEEE
  • Weakly guiding analysis of elliptical core step index waveguides based on the characteristic numbers of Mathieu's equation

    Publication Year: 1995 , Page(s): 2359 - 2371
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1180 KB)  

    A new weak guidance analysis for step index elliptical core optical fibers is developed. The method shows that weakly guiding, or linearly polarized (LP), modes are determined by and correspond uniquely to the characteristic numbers of Mathieu's equation. This is the first analysis of elliptical core weakly guiding modes which determines propagation constants and indexes modes by directly solving the underlying Mathieu's equation through the sole use of characteristic numbers. The resulting new analysis resolves an ambiguity in the standard literature concerning the classification of weakly guiding modes View full abstract»

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  • All-fiber Faraday rotator made by a multiturn figure-of-eight coil with matched birefringence

    Publication Year: 1995 , Page(s): 2349 - 2353
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    With a figure-of-eight winding of monomode fiber, we have been able to build multiturn (>100) coils which can be easily trimmed to match the condition of exactly one wavelength-per-turn birefringence. As an example, we report a 45° Faraday rotator intended for an all-fiber optical isolator at λ=1300 nm View full abstract»

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  • Ultra-wideband monolithic photoreceivers using HBT-compatible HPTs with novel base circuits, and simultaneously integrated with an HBT amplifier

    Publication Year: 1995 , Page(s): 2301 - 2307
    Cited by:  Papers (16)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (960 KB)  

    This paper presents two kinds of monolithically integrated ultra-wideband photoreceivers that use HBT-compatible HPTs with novel base circuits. The HPT photoreceiver, which consists of an HPT with an inductor and series resistor base circuit, yields ultra-broadband operation with 3 dB bandwidth from 0.43-12.1 GHz and over 11 dB gain compared to a photodiode with identical quantum efficiency. The HPT/HBT photoreceiver, which consists of an HPT with an inductor at the base terminal followed by an HBT amplifier circuit, yields ultra-wideband operation from 8.5-20.5 GHz (bandwidth of 12 GHz) with over 20 dB gain. The bandwidths of these photoreceivers are state-of-the art for monolithically integrated photoreceivers using HPT/HBT structures. The proposed photoreceivers, which are based on mature MMIC technologies, offer several other remarkable features such as good design accuracy and extremely small chip size View full abstract»

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  • Thermal stability of bias point of packaged linear modulators in lithium niobate

    Publication Year: 1995 , Page(s): 2314 - 2319
    Cited by:  Papers (3)
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    The thermal stability of the bias point of packaged, passively biased, X-cut LiNbO3 interferometric modulators is described. Absolute stability is assessed and a comparison is made of stability before and after laser ablation adjustment used to tune the bias point to linear operation (90° phase angle). Ablation is shown to be successful in setting the bias angle to ±1° of the desired value. The angle remained stable to a total variation of <5° over -25-+42°C both before and after ablation. All the observed angular changes with temperature were in the range 0.02-0.09 deg/°C. The effect of humidity in the package on modulator stability is characterized and then minimized for the actual devices View full abstract»

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  • Planar lightwave circuit platform with coplanar waveguide for opto-electronic hybrid integration

    Publication Year: 1995 , Page(s): 2320 - 2326
    Cited by:  Papers (12)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (772 KB)  

    We propose a planar lightwave circuit (PLC) platform constructed on a silica-on-terraced-silicon (STS) substrate for opto-electronic hybrid integration. This platform consists of an embedded silica PLC region, a terraced silicon region for optical device assembly, and a high-speed electrical circuit region. In the electrical circuit region, the coplanar waveguides (CPW) are prepared on a thick-silica/silicon substrate. This structure reduces the propagation loss of the CPW drastically to 2.7 dB/cm at 10 GHz, because the loss tangent (tan δ) of the dielectric constants of silica is much smaller than that of silicon. In order to study the feasibility of this PLC-platform for multi-gigabit operation, we used it to fabricate an LD module in which an LD chip and LD-driver integrated circuits (IC) are assembled on the PLC-platform. A bit error rate measurement of this LD module in a 2.5 Gb/s NRZ showed that this platform is applicable to multi-gigabit optical signal processing View full abstract»

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  • Multiwavelength picosecond optical pulse generation using an actively mode-locked multichannel grating cavity laser

    Publication Year: 1995 , Page(s): 2327 - 2335
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (864 KB)  

    A multichannel grating cavity (MGC) InGaAsP-InP ridge diode laser is found to be suitable for multiwavelength ultrashort optical pulse generation using active mode-locking techniques. By using different configurations of the MGC laser, dual wavelength picosecond pulses are successfully produced with good spectral quality, either simultaneously or with a programmable relative delay between the channels. For a channel separation of 2.2 nm, pulses with a duration of 60 ps and a spectral width of 11.6 GHz have been obtained. The experimental results are compared with those from a theoretical analysis of the multiwavelength mode-locking process using a set of modified coupled-cavity rate equations. The minimum achievable pulsewidths generated by the actively mode-locked MGC laser are shown to be limited by the resolution bandwidth of grating used. The dependence of pulsewidth on RF drive frequency detuning is examined and it is found that the ultrashort pulses can be obtained over a wide range of frequency detuning. The interchannel cross-talk originating from gain saturation and carrier depletion is also discussed View full abstract»

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  • Phase-shifted Bragg-grating filters with improved transmission characteristics

    Publication Year: 1995 , Page(s): 2354 - 2358
    Cited by:  Papers (27)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    Standard Bragg filters (dielectric waveguides with a grating overlay) show a stopband only in reflection. Filters with quarter-wave-shifted gratings have an extremely narrow transmission peak the center of the stopband but its shape (a sharp triangle with a broad bottom) is not suitable for system design. Using standard coupled-mode theory together with transfer-matrix formalism, we show that by introducing several phase-shift regions and properly choosing their locations and magnitudes the transmission spectrum can be tailored into a nearly rectangular shape. For InP-InGaAsP based Bragg-grating filters estimates are made of achievable channel spacings in wavelength-division multiplexing systems View full abstract»

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  • Control of apex shape of the fiber probe employed in photon scanning tunneling microscope by a multistep etching method

    Publication Year: 1995 , Page(s): 2308 - 2313
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (740 KB)  

    In this paper, we discuss about the control of the shape of the very apex of a sharpened fiber probe used in photon scanning tunneling microscope (PSTM) by means of a method based on selective chemical etching. Under ambient conditions, through a multistep etching method proposed here, fiber probes with a flattened apex having a diameter of around 15-20 nm could be produced with high reproducibility. It has also been discovered that, during the etching process, the shape of the apex of the probe takes a rounded or a flattened shape with respect to the etching time in an almost cyclic fashion and such a phenomenon could help in understanding the mechanism of the etching process. These kind of probes with flat apex after metal coating are suitable for the fabrication of apertured probes used in PSTM and also for super tips which have a promising future as nanosensors in the fields of biology and biochemistry View full abstract»

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  • Delayed self-multiplex light source for frequency-agile transmitters

    Publication Year: 1995 , Page(s): 2336 - 2342
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (716 KB)  

    The delayed self-multiplex (DSM) light sources proposed in this paper provide multiple frequency-agile outputs from a single tunable laser. The DSM light source employs multiple fiber delay lines and optical switches, and overcomes the intrinsic tuning-speed limitation and thermal frequency drift of the tunable laser. Practical switching performance restricted by the optical switch is analyzed and examined in a delayed self-duplex (DSD) light source constructed with a tunable DBR laser and a LiNbO3 electrooptic switch. Bit-error-free operation of the frequency-agile transmitter is achieved in 622 Mb/s transmission; the power penalty due to the DSD light source is 1.8 dB View full abstract»

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  • A computer controlled narrow bandpass optical tunable filter using a Fourier diffraction grating in the range of 1.3-1.55 μm

    Publication Year: 1995 , Page(s): 2343 - 2348
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (556 KB)  

    A novel tunable filter using a Fourier grating is studied and discussed. It consists of a Fourier grating, a collimator lens, single-mode fibers, and a computer controlled rotary actuator. It has very low polarization dependence of less than 0.3 dB, an insertion loss of less than 3 dB, and a narrow bandwidth of 1.5 nm. Wavelength selection was realized by rotating the grating, which was controlled by a computer. The device is able to select the light at the desired wavelength from more than 100 WDM optical data streams with 2 nm spacing in the range of 1.3-1.55 μm View full abstract»

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  • Impedance boundary method of moments with extended boundary conditions

    Publication Year: 1995 , Page(s): 2372 - 2377
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB)  

    An improved impedance boundary method of moments is proposed to accurately and efficiently determine the propagation characteristics of multilayer planar optical waveguides whose refractive index profiles contain large step index changes or a graded-index region combined with step index changes. Extended impedance boundary conditions are used in the impedance boundary method of moments to replace regions in the waveguide structure which have refractive index discontinuities. Two methods for determining the extended boundary conditions include the standard transfer matrix method and a procedure utilizing a cascaded transmission line representation with successive calculation of input impedances. Simulation results show significantly improved convergence rates in the determination of propagation constants 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