IEE Proceedings - Optoelectronics
Volume 146, Issue 4, August 1999
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Volume 146, Issue 4
August 1999
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- Author(s): J. Piotrowski and J. Kaniewski
- Source: IEE Proceedings - Optoelectronics, Volume 146, Issue 4, p. 173 –175
- DOI: 10.1049/ip-opt:19990658
- Type: Article
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p.
173
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The ultimate signal-to-noise performance of infrared photodetectors is limited by the statistical nature of the thermal generation and recombination of charge carriers. Band-to-band Auger processes dominate in a high quality InGaAs used for photovoltaic detector operating at room temperature. The performance of devices operating in the 2–3.4μm spectral range has been analyzed theoretically. Homo- and heterostructure devices have been considered. The use of n+np+ (or n+pp+) with heavily doped regions has been found to prevent the recombination of photogenerated carriers at contacts, but the bulk thermal generation in the heavily doped regions will significantly reduce the performance of the devices. - Author(s): P. M. Lane and K. Kitayama
- Source: IEE Proceedings - Optoelectronics, Volume 146, Issue 4, p. 177 –180
- DOI: 10.1049/ip-opt:19990787
- Type: Article
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p.
177
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An analysis is presented of the BER achievable in an ASK modulated millimetre-wave self-heterodyne fibre radio system. The analysis shows that such systems require a depressed decision threshold if they are to exhibit optimum performance. This is due to the conversion of laser phase noise to intensity noise after the two optical carriers have experienced different delays due to propagation through the dispersive fibre. Results are presented that show the practicality of such systems over a very wide range of operating conditions. - Author(s): W. M. Wong and H. Ghafouri-Shiraz
- Source: IEE Proceedings - Optoelectronics, Volume 146, Issue 4, p. 181 –188
- DOI: 10.1049/ip-opt:19990690
- Type: Article
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181
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The transmission-line laser model is a powerful and flexible method to model various types of laser devices. An integrated laser transmitter model comprising the intrinsic laser, an electrical parasitics network and a passive matching network is proposed for microwave-optoelectronic simulation in the time domain. Transmission-line matrix stub lines and link lines are used to model the matching network and electrical parasitics. The passive matching network is based on monolithically integrated lumped elements. The effect of electrical parasitics has been taken into account when designing the matching network. Simulation results are in good agreement with those of commercial software. A microwave application of the integrated laser transmitter model is demonstrated in harmonic generation through gain switching. - Author(s): R. M. Howard
- Source: IEE Proceedings - Optoelectronics, Volume 146, Issue 4, p. 189 –200
- DOI: 10.1049/ip-opt:19990732
- Type: Article
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189
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A generic opto-electronic receiver structure, is analysed and conditions are specified which, when valid, result in a receiver with double the signal to noise ratio of a standard opto-electronic receiver. Experimental results from a high-gain, low-bandwidth, transimpedance amplifier are presented to verify the theory and to show that this performance level can be attained. It is shown that the bandwidth and overload sensitivity of the dual sensing opto-electronic receiver can be comparable with that of a standard receiver. - Author(s): D. J. Santos and F. J. Fraile-Peĺæz
- Source: IEE Proceedings - Optoelectronics, Volume 146, Issue 4, p. 201 –203
- DOI: 10.1049/ip-opt:19990637
- Type: Article
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p.
201
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The authors study the equivalence between two common normalisations used in the derivation of shot-noise in optical digital receivers. The role played by the bit rate in both approaches is discussed. They conclude that both approaches are formally equivalent, but one is conceptually preferrable. Furthermore, no absolute result can be given on the influence of bit rate on the receiver shot-noise performance. Any result is necessarily relative to the normalisation used. - Author(s): Y. Zhu ; V. A. Handerek ; J. Kanka ; A. J. Rogers
- Source: IEE Proceedings - Optoelectronics, Volume 146, Issue 4, p. 204 –208
- DOI: 10.1049/ip-opt:19990636
- Type: Article
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p.
204
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Passive modelocking of a passive nonlinear directional coupler ring laser employing a near-half-beat-length passive twin-core fibre is numerically simulated by taking into account Raman self frequency shift and gain saturation. Raman self frequency shift is reduced by inserting two bandpass filters. Modelocking threshold condition and steady-state characteristics are investigated in extensive numerical experiments. It is found that, in addition to solitonic modelocking operation regime predicted by previous studies, non-soliton and chirped soliton operation regimes also exist in such a laser. The solitonic modelocking operation requires a proper balance of saturable amplification, bandpass filtering, nonlinear coupling and output coupling. The generation of transform-limited solitons with durations as short as 0.44 ps and pedestal extinctions of better than 40 dB is numerically demonstrated.
Optimisation of InGaAs infrared photovoltaic detectors
The interaction between fibre dispersion and laser phase noise in an ASK self-heterodyne millimetre-wave fibre-radio system
Integrated semiconductor laser-transmitter model for microwave-optoelectronic simulation based on transmission-line modelling
Dual sensing receiver structure for halving the amplifier contribution to the input equivalent noise of an opto-electronic receiver
Pulse normalisation in optical receiver shot-noise performance
Numerical simulation of a passive twin-core fibre nonlinear coupler ring laser
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