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Lightwave Technology, Journal of

Issue 10 • Date Oct. 1989

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  • Journal of Lightwave Technology - Table of Contents

    Publication Year: 1989
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    Freely Available from IEEE
  • Optoelectronic integrated receivers on InP substrates by organometallic vapor phase epitaxy

    Publication Year: 1989 , Page(s): 1510 - 1514
    Cited by:  Papers (5)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (396 KB)  

    The monolithic integrated ion of a p-i-n photodiode and a high-electron mobility transistor (HEMT) amplifier on an InP substrate by organometallic vapor-phase epitaxy is discussed. The receiver operated with up to 1.6 Gb/s nonreturn-to-zero optical signals. The responsivity was 1 kV/W and the minimum optical power at a bit error rate of 10-9 was -24 dBm for 400 Mb/s nonreturn-to-zero optical signals View full abstract»

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  • Modeling of graded-index channel waveguides using nonuniform finite difference method

    Publication Year: 1989 , Page(s): 1581 - 1589
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (620 KB)  

    A finite-difference method (FDM) with nonuniform discretization for the analysis of channel waveguides is presented. Application of the boundary conditions for either the quasi-TE or quasi-TM mode is illustrated. Flexible discretization of the grid structures minimizes memory size, resulting in much smaller computing time without sacrificing the accuracy of the solution. This nonuniform discretization FDM technique is used to model the well-guided small-mode-size Ti:LiNbO 3 waveguides. The model treats both finite and infinite source diffusion cases. Quasi-TM mode profiles and the corresponding eigenvalues are rigorously evaluated and the theoretical results agree very well with the experimental results View full abstract»

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  • Sixteen-channel coherent broadcast network at 155 Mbit/s

    Publication Year: 1989 , Page(s): 1438 - 1444
    Cited by:  Papers (9)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (628 KB)  

    An experimental 155.52 Mb/s coherent broadcast network with 16 channels using a conventional distributed feedback (DFB) laser operating at 1540 nm is described. It includes absolute laser frequency stabilization, a fiber span of 74.4 km, and a balanced polarization-diversity single-filter frequency-shift keying (FSK) heterodyne receiver. At a channel spacing of 8.5 GHz a power penalty of 0.3 dB is incurred due to adjacent channel crosstalk View full abstract»

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  • Mechanical reliability of metallized optical fiber for hermetic terminations

    Publication Year: 1989 , Page(s): 1488 - 1493
    Cited by:  Papers (9)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB)  

    Hermetic packaging requirements for high-reliability fiber-optic devices can be met through the use of solder-sealed fibre penetrations. Local metallization of the fiber surface facilitates soldering but also modifies the fiber's strength and fatigue properties. A significant body of research addresses the properties of fibers coated with metal during fiber drawing, but the mechanical properties of fibers locally metallized after drawing have not been discussed. These properties were evaluated by means of dynamic fatigue tensile testing for fibres having a multilayer metallization applied by a vacuum deposition process. The results show that fiber strength reduction resulting from metallization is compensated by an increased resistance to static fatigue. Use of the results in reliability assurance is discussed View full abstract»

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  • Ultrawide bandwidth optical receivers

    Publication Year: 1989 , Page(s): 1432 - 1437
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB)  

    Low-noise p-i-n/HEMT optical receivers with bandwidths in excess of 16 GHz have recently been developed using advanced microwave design and packaging techniques. Here, state-of-the-art receiver technology, including design tradeoffs and implementation techniques for this class of ultrawide bandwidth receiver, is discussed. Some directions for future research are explored View full abstract»

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  • Influence of nondegenerate four-wave mixing on coherent transmission system using in-line semiconductor laser amplifiers

    Publication Year: 1989 , Page(s): 1525 - 1529
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB)  

    Three-channel coherent frequency-shift-keying (FSK) transmission experiments using in-line semiconductor laser amplifiers under the influence of nondegenerate four-wave mixing in laser amplifiers are discussed. The experiments show that the effect of four-wave mixing is reduced by applying modulation to the interfering carriers and enlarging the frequency separation of each carrier. However, transmission quality degradation becomes serious in multistage amplifier systems View full abstract»

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  • Low loss channel waveguides in polymers

    Publication Year: 1989 , Page(s): 1445 - 1453
    Cited by:  Papers (41)  |  Patents (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1104 KB)  

    The primary routes for creating polymeric channel waveguides are reviewed. Processes, materials, waveguide performance, and applications recently reported in the literature are covered. Emphasis is on an internal diffusion approach under development at Du Pont which has not been widely reported. The intent is to provide a perspective on the flexibility and versatility for fabricating polymer channel waveguides for practical integrated optic applications View full abstract»

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  • Operation of erbium-doped fiber amplifiers and lasers pumped with frequency-doubled Nd:YAG lasers

    Publication Year: 1989 , Page(s): 1473 - 1477
    Cited by:  Papers (3)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (460 KB)  

    An optical amplifier consisting of an erbium-doped germanosilicate fiber optically pumped at 532 nm is described. Negligible excited-state absorption at 532 nm allows efficient pumping, enabling a gain of 34 dB at 1536 nm to be obtained for only 25 mW of pump power. The pulsed pump source produces negligible noise on the small signal if the pump repetition rate is above 10 kHz. Pulsed laser operation is achieved by pumping a Fabry-Perot erbium-doped fiber laser with a frequency-doubled Q-switched Nd:YAG laser. Pulses of 0.9-W peak power and 280-ns duration at 1.538-μm were obtained View full abstract»

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  • Low-loss small-mode passive waveguides and near-adiabatic tapers in BK7 glass

    Publication Year: 1989 , Page(s): 1590 - 1596
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (604 KB)  

    A detailed study of the Ag+-Na+ ion-exchange in BK7 glass and fabrication of low-loss (<0.2 dB/cm at λ0=1.3 μm) single-mode waveguides using this technique are discussed. By postbaking the extremities of small-mode-size straight-surface guides, 5-mm-long near-adiabatic fiber-compatible tapered transitions with total fiber-device insertion losses below 0.8 dB in 16-mm-long devices, including the tapers at both ends, have been demonstrated View full abstract»

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  • A novel integrated acoustooptic frequency shifter

    Publication Year: 1989 , Page(s): 1575 - 1580
    Cited by:  Papers (2)
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    An integrated optical frequency shifter that utilizes guided-wave acoustooptic Bragg diffractions in cascade from two tilted- and counterpropagating-surface acoustic waves is reported. The doubly and frequency-shifted diffracted light propagates in a fixed direction, but spatially resolved from the incident light, irrespective of the magnitude of frequency tuning. A device fabricated in a Y-cut LiNbO3 planar waveguide has demonstrated desirable characteristics, including single-sideband suppressed-carrier properties, a frequency shift centered at 1 GHz, a tunable bandwidth of 165 MHz, a linear dynamic range greater than 41 dB, and high efficiency at the optical wavelength of 0.63 μm. These preliminary results suggest that a compact integrated acoustooptic frequency shifter module capable of multigigahertz center frequency and gigahertz bandwidth can be realized in a common LiNBO3 substrate 0.2 cm×1.0 cm×1.5 cm in size View full abstract»

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  • Glass waveguides on silicon for hybrid optical packaging

    Publication Year: 1989 , Page(s): 1530 - 1539
    Cited by:  Papers (46)  |  Patents (69)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1024 KB)  

    Work on deposited glass waveguides on silicon to form waveguides and filters is reviewed. The choice of these particular waveguides makes sense only as part of a consistent approach to optoelectronic packaging. Hybrid optical packaging on silicon (HOPS) is described and briefly compared with other techniques. For these packages, two waveguides were developed: a tight mode waveguide with a silicon nitride rib core for matching a semiconductor laser and a loose mode waveguide with a phosphosilicate glass core for matching an optical fiber View full abstract»

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  • 1.55-μm narrow-linewidth and high-power distributed feedback lasers for coherent transmission systems

    Publication Year: 1989 , Page(s): 1515 - 1519
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB)  

    Stable operation of 1.55-μm distributed feedback lasers with a narrow linewidth and high power is demonstrated for coherent transmission systems. Narrow linewidth and high power were realized by improving the geometrical uniformity of the active region and thinning the active layer by using MOVPE and a dry-etching technique. A narrow linewidth of 1 MHz was achieved at a high power of 20 mW for a distributed feedback laser with a thin active layer of 0.07 μm and a long cavity of 1.2 mm View full abstract»

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  • Ten-to-twenty gigabit-per-second modulation performance of 1.5-μm distributed feedback lasers for frequency-shift-keying systems

    Publication Year: 1989 , Page(s): 1454 - 1460
    Cited by:  Papers (22)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (660 KB)  

    The frequency modulation (FM) and amplitude modulation (AM) responses of a 1.5-μm distributed feedback (DFB) laser were measured to 15 GHz. At 9-mW output power, the magnitude of the FM response was flat out to 12 GHz, and there was a 15-25-ps delay between the FM and AM responses. Computer simulation techniques indicate that the measured FM response is adequate to produce good eye patterns for frequency-shift-keying modulation at data rates up to 20 Gb/s. The high-speed frequency-shift-keying modulation capability of this 1.5-μm DFB laser was experimentally confirmed at 11 Gb/s View full abstract»

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  • Optical time domain reflectometry on optical amplifier systems

    Publication Year: 1989 , Page(s): 1549 - 1555
    Cited by:  Papers (9)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (728 KB)  

    The use of optical time-domain reflectometry (OTDR) on long-span fiber transmission systems containing in-line optical amplifiers is discussed. Having identified the specific requirements for OTDR equipment, measurements were carried out on systems of up to 300 km in length, containing three semiconductor laser amplifiers. The results demonstrate that OTDR can be used not only for fault location on fiber links several hundred kilometers in length but also as an alternative to standard system supervisory techniques, thus providing the potential for minimizing the hardware in the optical amplifier stages of future long-span fiber optic transmission systems View full abstract»

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  • Fabrication of periodically domain-inverted channel waveguides in lithium niobate for second harmonic generation

    Publication Year: 1989 , Page(s): 1597 - 1600
    Cited by:  Papers (12)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (412 KB)  

    A method to produce periodically domain-inverted channel waveguides in LiNbO3 is reported. With this type of waveguide, using quasi-phase matching (QPM), arbitrary wavelengths can be frequency doubled by choosing the appropriate period. It is concluded that, with improved fabrication methods, it will be possible to generate milliwatts of blue light with a diode laser as pump, which is of considerable interest View full abstract»

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  • A TE-TM mode splitter in LiNbO3 by proton exchange and Ti diffusion

    Publication Year: 1989 , Page(s): 1567 - 1574
    Cited by:  Papers (28)  |  Patents (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (672 KB)  

    A TE-TM mode splitter using branching waveguides made by proton exchange (PE) and Ti indiffusion (TI) in Z-cut LiNbO3 is proposed and designed using the coupled mode theory. The TE-TM mode splitting was experimentally verified, and extinction ratios of 20 dB and more than 20 dB were successfully achieved for TM and TE modes, respectively. The effective index of the PE waveguide was controlled through the PE and postannealing time at fixed temperatures. An equivalent device for two-way communication is suggested and discussed theoretically View full abstract»

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  • Fiber-optic tapping via induced scattering

    Publication Year: 1989 , Page(s): 1556 - 1558
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    A noninvasive and potentially inexpensive method for fabricating a passive linear tapped optical waveguide bus is described. In the method, a small flame or a CO2 laser is used as a heat source to induce devitrification within the alumina-doped cores of multimode waveguide fibers having numerical apertures in the range of 0.25-0.29. The discrete crystal sites created by careful localized heating can be used to scatter controlled fractions of propagating light onto a detector View full abstract»

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  • Continuously tunable thin active layer and multisection DFB laser with narrow linewidth and high power

    Publication Year: 1989 , Page(s): 1504 - 1509
    Cited by:  Papers (13)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (552 KB)  

    The feasibility of a wavelength tuning range of 1 nm with the spectral linewidth around 2.5 MHz at about 10 mW is demonstrated in thin-active-layer and multisection 1.5-μm distributed feedback (DFB) lasers with long cavities. The tuning range is widened to over 3 nm by combining electric and thermal tuning effects. A flat FM response with an efficiency of over 1 GHz/mA from low to high (around 1 GHz) frequency is also achieved View full abstract»

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  • Multiwavelength sources using laser diodes frequency-locked to atomic resonances

    Publication Year: 1989 , Page(s): 1540 - 1548
    Cited by:  Papers (14)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (748 KB)  

    It is shown that low-cost compact disk AlGaAs laser diodes make it possible to realize manifold optical sources with precise and stable wavelengths when locked to rubidium vapor resonances. Many optical frequency references can be obtained with the use of absorption cells containing a foreign gas or by placing cells in static magnetic fields. The same approach can be used with other wavelengths required by optical fiber communications View full abstract»

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  • Er3+-Yb3+ and Er3+ doped fiber lasers

    Publication Year: 1989 , Page(s): 1461 - 1465
    Cited by:  Papers (10)  |  Patents (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (508 KB)  

    Single-mode fiber lasers operating at ~1.57 μm are described. Output powers of >2 mW are reported for laser diode pumped operation. Direct comparison is made between fiber lasers using sensitized erbium (Er3+ and Yb3+) and erbium on its own. The performance of Er3+-Yb3+ fiber lasers is analyzed in more detail as a function of fiber length. Both CW and Q-switched operations are studied and the results obtained demonstrate that practical sources at 1.5 μm are available from diode pumped Er3+ -Yb3+ systems View full abstract»

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  • Experimental evaluation of chromatic dispersion distortion in optical CPFSK transmission systems

    Publication Year: 1989 , Page(s): 1484 - 1487
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (316 KB)  

    Receiver sensitivity degradations due to fiber chromatic dispersion without chromatic dispersion compensation in multigigabit optical continuous-phase frequency-shift-keying (CPFSK) transmission systems are evaluated experimentally and theoretically. Transmission distance limited by the chromatic dispersion of 15 ps/nm/km is estimated to be 130 km at 5 Gb/s and 33 km at 10 Gb/s View full abstract»

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  • High-speed switching of monolithic arrays of grating-surface-emitting diode lasers

    Publication Year: 1989 , Page(s): 1520 - 1524
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (472 KB)  

    The electrooptic switching properties of injection-coupled coherent two-dimensional grating-surface-emitting (GSE) laser arrays with multiple gain sections and quantum-well active layers are discussed. Within such an array of injection-coupled GSE lasers, a single gain section can act as an intracavity saturable loss element that can modulate the output of the entire array. Experimental results demonstrate efficient subnanosecond switching of high-power GSE laser arrays by operating only one gain section as an intracavity loss modulator View full abstract»

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  • Ion-milled waveguide lenses and lens arrays in GaAs

    Publication Year: 1989 , Page(s): 1559 - 1566
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (736 KB)  

    The authors discuss ion-milled planar waveguide lenses in GaAs which exhibit a considerably higher efficiency than that previously reported for those lenses and near diffraction-limited spot size. The authors also report the performance characteristics of these latest lenses, including single lenses and lens array of analog Fresnel, chirp grating, and hybrid types as well as a collimation-Fourier transformation lens-pair, together with the detailed design and fabrication procedures. A simple theoretical model for the lens efficiency is also formulated to assist in the lens design. Ion milling has been shown to be a simple and versatile technique for fabrication of waveguide lenses in GaAs and applicable to any other substrate material. Such ion-milled waveguide lenses should facilitate realization of a variety of monolithically integrated optic device modules and circuits in GaAs and other related substrates with applications to communications, signal processing, and computing View full abstract»

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  • Transmitted power variations in single-mode fiber joints with obliquely polished endfaces

    Publication Year: 1989 , Page(s): 1478 - 1483
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (572 KB)  

    An experimental and theoretical study of multiple-beam interference effects at oblique endface airgap joints, with endfaces oriented parallel to each other, is discussed. It was found that although excellent return loss performance can be obtained by using such joints, large variations in the transmitted power can result in small changes in endface separation. Compared to the case of nonoblique endfaces, endface separation between the successive fringes in oblique endfaces increases by a factor which depends on the oblique angle and the refractive index of the gap material 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