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  • 1
    Electronic Resource
    Electronic Resource
    Effect of many weak side modes on relative intensity noise of distributed feedback semiconductor lasers (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 888-890 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An increase of the relative intensity noise of nearly single-mode distributed feedback lasers with respect to that predicted by single-mode theory after propagation in dispersive fiber at frequencies up to 5 Ghz has been measured. A simplified multimode theory is presented which explains the increase in noise. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120926
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    Paper (German National Licenses)
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    Effect of many weak side modes on relative intensity noise of distributed feedback semiconductor lasers (1998)
    American Institute of Physics
    Details
    Publication Date: 1998-02-23
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 3
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    Low data rate coherent optical link demonstration using frequency stabilized solid state lasers (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A low data rate laboratory heterodyne link demonstration operating at 1.06 micron using frequency stabilized Nd:YAG lasers was implemented. The data was modulated onto the optical carrier at 100 kbps using binary pulse position modulation. Phase coherent reception was achieved by closing the receiver phase tracking loop around the piezo-electric and temperature-tuned local oscillator laser. Initial frequency acquisition was accomplished by linearly scanning the LO frequency over the uncertainty range while a combined frequency and phase tracking loop searches for a lock indicator signal. The link performance was experimentally evaluated and compared to the theoretical predictions.
    Keywords: OPTICS
    Type: In: Free-space laser communication technologies III; Proceedings of the Meeting, Los Angeles, CA, Jan. 21, 22, 1991 (A93-18923 05-74); p. 170-181.
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Word and frame synchronization with verification for PPM optical communications (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A method for obtaining word and frame synchronization in pulse position modulated optical communication systems is described. The method uses a short sync sequence inserted at the beginning of each data frame and a verification procedure to distinguish between inserted and randomly occurring sequences at the receiver. This results in an easy to implement sync system which provides reliable synchronization even at high symbol error rates. Results are given for the application of this approach to a highly energy efficient 256-ary PPM test system.
    Keywords: COMMUNICATIONS AND RADAR
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    NASA TECHNICAL REPORTS
  • 5
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    Simple method for designing or analyzing an optical communication link (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A simple method is described for determining the performance of a free space optical communication link. The method can be used either in the system design (synthesis) mode, or in the performance evaluation (analysis) mode. Although restricted to photo counting based detection (e.g., photomultiplier tube or equivalent) of pulse position modulated signals, the method is still sufficiently general to accommodate space-based, as well as ground-based, reception.
    Keywords: COMMUNICATIONS AND RADAR
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    NASA TECHNICAL REPORTS
  • 6
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    Transmitter pointing loss calculation for free-space optical communications link analyses (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: In calculating the performance of free-space optical communications links, the transmitter pointing loss is one of the two most important factors. It is shown in this paper that the traditional formula for the instantaneous pointing loss (i.e., for the transmitter telescope far-field beam pattern) is quite inaccurate. A more accurate and practical approximation is developed in which the pointing loss is calculated using a Taylor series approximation. The four-term series is shown to be accurate to 0.1 dB for the theta angles not greater than 0.9 lambda/D (wavelength/telescope diameter).
    Keywords: COMMUNICATIONS AND RADAR
    Type: Applied Optics (ISSN 0003-6935); 26; 2055-205
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    NASA TECHNICAL REPORTS
  • 7
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    Optical Phase-Locked Loop For Optical Communication (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Experimental apparatus includes two diode-pumped solid-state lasers of non-planar-ring-oscillator type, one represents the transmitting oscillator, other local oscillator in receiver. Output of transmitting oscillator is amplitude-modulated with pulse-position-modulated data stream. Phase-error variance of less than 0.05 mrad(Sup 2) achieved with relatively-narrow-band loop. Applications include free-space and fiber-optic communications, navigation, and scientific instrumentation in which receivers are required to track phases of transmitted signals.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-18200 , NASA Tech Briefs (ISSN 0145-319X); 16; 4; P. 40
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    NASA TECHNICAL REPORTS
  • 8
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    Analyzing Optical Communications Links (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Optical Communication Link Analysis Program, OPTI, analyzes optical and near-infrared communication links using pulse-position modulation (PPM) and direct detention. Link margins and design-control tables generated from input parameters supplied by user. Enables user to save sets of input parameters that define given link and read them back into program later. Alters automatically any of input parameters to achieve desired link margin. Written in FORTRAN 77.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-17444 , NASA Tech Briefs (ISSN 0145-319X); 14; 3; P. 68
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Synchronization Scheme For PPM Communication (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Synchronization achieved under difficult, low-signal conditions. Synchronization scheme for pulse-position modulation (PPM) matches pulse, word, and frame timeslots of receiver to received signals to ensure proper identification of received pulses. Involves brief sequence of synchronizing pulses within each transmitted frame and relies on periodic repetition of synchronizing pulses for verification. Use of verification reduces number of synchronizing pulses required but increases time required to achieve synchronization.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-17033 , NASA Tech Briefs (ISSN 0145-319X); 12; 6; P. 58
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Diffractively Coupled, Refractively Guided Lasers (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Semiconductor-laser arrays more reliable, more powerful, and easier to make. Improved design intended to eliminate undesired electromagnetic modes and mode shifts sometimes occuring in gain-guided variety. Reflected from mirror/window at end of common resonator section of laser, energy refracted from each laser enters adjacent laser. Mutual coupling establishes phase relationships among lasers. Monolithic laser array made by standard epitaxial techniques. Made in part with polymeric materials to mitigate some deleterious effects of all-expitaxial processing. Potential applications include optical communications, ranging, printing, and recording.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-16927 , NASA Tech Briefs (ISSN 0145-319X); 11; 10; P. 24
    Format: text
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    NASA TECHNICAL REPORTS
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