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  • 1
    Electronic Resource
    Electronic Resource
    Equivalent step-index profile for graded W-fibres: application to TE01 mode cut-off (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 483-499 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Snyder's equivalent step-index method is extended to the case of graded profiles with a depressed cladding. This method is then used to determine the limit of monomode operation. Comparison with the results obtained by an exact numerical technique is made for a large variety of simulated profiles, including those with ripples in the cladding. Conclusions are drawn concerning the sensitivity of various profile-shapes to such ripple structure. The method is applied also to measured profiles, reconstructed by a well-known tomographic procedure. In this latter case a comparison is made with experimentally determined values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00610305
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  • 2
    Electronic Resource
    Electronic Resource
    Optical amplifier bistability on reflection (1987)
    Springer
    Optical and quantum electronics 19 (1987), S. S37 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Calculations are presented of bistable characteristics occurring on reflection from Fabry-Perot and distributed feedback laser amplifiers. Depending on the drive current and wavelength detuning, a variety of non-linear and bistable behaviour can be expected, including a new form of hysteresis loop not hitherto widely discussed. Switching powers and speeds are calculated for 1.5 μm InGaAsP amplifiers, and some potential applications for these effects are explored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02034350
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  • 3
    Electronic Resource
    Electronic Resource
    Theory of two-section laser amplifiers (1989)
    Springer
    Optical and quantum electronics 21 (1989), S. S15 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A new theory of two-section amplifiers has been developed in order to account explicitly for dispersive effects arising from the carrier dependence of the refractive index. It has been found that non-linear and bistable effects in two-section devices, which are conventionally attributed to saturable absorption, contain a stong component of dispersive non-linearity. The implication is that the advantages claimed for two-section amplifiers over single-section devices may not be as great as had hitherto been thought.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02117680
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinearities in semiconductor laser amplifiers (1995)
    Springer
    Optical and quantum electronics 27 (1995), S. 1-13 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract This review discusses the physical mechanisms of absorptive and dispersive nonlinearity in amplifiers resulting from interband and intraband electron transitions, with an assessment of the relative strengths and response times of these nonlinearities. Where appropriate, the potential applications of these nonlinearities in optical networks are also indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00431029
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  • 5
    Electronic Resource
    Electronic Resource
    Rate equations and transient phenomena in semiconductor lasers (1973)
    Springer
    Optical and quantum electronics 5 (1973), S. 201-215 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract This contribution attempts to review certain resonance effects which occur in the dynamic behaviour of semiconductor lasers. To study these effects theoretically, a rate equation approach is used for single-mode operation in the region of lasing threshold. The two basic rate equations are given and their transient solutions discussed. The existence of two time constants in these equations, viz. the electron lifetimeτ e and the photon lifetimeτ e; gives rise to a characteristic resonance frequency in the GHz region. This resonance manifests itself in transient ‘spiking’ effects, in quantum noise phenomena, and in high-frequency modulation experiments. In a modified form the resonance frequency may also be studied in lasers with external cavities and in double-diode configurations (or, equivalently, conventional devices with non-uniform excitation along the cavity length). In the latter two examples mentioned above, the resonance is excited by optical feedback of the laser radiation into the active medium via a ‘lossy’ or insufficiently inverted region. In the ‘spiking’ oscillations commonly observed at the commencement of laser operation, the initial ‘population overshoot’ is the cause of the resonance. For the case of quantum noise it is the requirement that the photon and electron populations have integer values which supplies the driving force-a true quantum effect. High-frequency modulation experiments directly reveal the same resonance frequency where a strong maximum in modulation intensity occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414739
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of doping and free carriers on the refractive index of direct-gap semiconductors (1974)
    Springer
    Optical and quantum electronics 6 (1974), S. 199-216 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A model for the doping and current dependence of the refractive index of direct-gap semiconductors has been developed and applied to GaAs in order to explain certain properties of single heterostructure injection lasers. The model involves the concept of an effective energy gap which takes account of the effects of doping and free carriers via the Burstein shift, the exchange interaction, and the average screened Coulomb potential of the impurities. This effective gap, together with empirical results for the energy dependence of the refractive index, facilitates the calculation of refractive index changes with doping and current. Numerical results are given for GaAs, and the model is applied particularly to the substrate and active regions of single heterostructure injection lasers. In these devices the refractive index values are particularly important in determining the dielectric waveguide properties. With the aid of our model, this feature can be discussed in detail, with special reference to the breakdown of the waveguide effect which occurs (a) for substrate doping levels below a critical value, and (b) for currents well above threshold ('saturation').
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01423984
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  • 7
    Electronic Resource
    Electronic Resource
    Theory of the double heterostructure laser: II. Waveguide model incorporating carrier concentration-dependent refractive index (1976)
    Springer
    Optical and quantum electronics 8 (1976), S. 373-381 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Solutions to charge transport equations are used to illustrate the variation of the active region refractive index of the double-heterostructure GaAs laser. It is shown that a marked asymmetry can arise in the refractive index. In this paper, a suitable waveguide theory is developed to take account of this effect. The necessity for such a waveguide theory is demonstrated by comparing threshold current densities and far-field patterns calculated with this model to those calculated using a simpler waveguide model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624828
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  • 8
    Electronic Resource
    Electronic Resource
    Theory of the double heterostructure laser: III. Self-consistent calculations of the electrical and optical characteristics (1976)
    Springer
    Optical and quantum electronics 8 (1976), S. 383-391 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Self-consistent calculations of the electrical and optical properties of the double-heterostructure laser have been made. Theoretical studies of both aspects of the device performance have been utilized in this work which describes the behaviour of the laser both below and at threshold. The interdependence of the electrical and optical properties of the device has been established and incorporated into a self-consistency scheme. A computer program has been developed to perform the calculations given the specification of device parameters. Within the program the transport equations are solved, the active region refractive index calculated and then used in the waveguide theory. From the solution to the waveguide equations a lasing frequency and threshold current for the specified cavity mode are obtained. A consistency criterion is applied between the transport and waveguide parts of the theory. The program allows the performance of the laser to be monitored providing such information asI–V characteristics, near and far field patterns for various cavity modes with their threshold currents and lasing frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624829
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  • 9
    Electronic Resource
    Electronic Resource
    The cladded parabolic-index profile waveguide: analysis and application to stripe-geometry lasers (1978)
    Springer
    Optical and quantum electronics 10 (1978), S. 17-29 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A two-dimensional real waveguide having a parabolic distribution of dielectric permittivity in the core region, flanked by cladding layers of constant refractive index is proposed as a model for a class of stripe-geometry injection lasers. The model is analysed by a series-solution method and results are given in terms of plots of normalized propagation constant, near-field filling factor, and far-field half-angle, all versus normalized frequency. These results are compared with those for the alternative models of (a) a homogeneous core waveguide, and (b) a medium whose dielectric permittivity varies quadratically with position throughout the whole of space. Apart from the series-solution method which was employed, a survey is included of other techniques available for analysing this waveguide model. These include perturbation theory, variational analysis, an exact solution of the scalar wave equation, and the WKB approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620240
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  • 10
    Electronic Resource
    Electronic Resource
    Erratum: 'Theory of two-section laser amplifiers' (1992)
    Springer
    Optical and quantum electronics 24 (1992), S. 377-377 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619410
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