Journal ArticleDOI
Improved germanium avalanche photodiodes
TLDR
In this paper, germanium avalanche photodiodes with n+-n-p and p+n-n structures were devised for improved excess noise and high quantum efficiency performance.Abstract:
New kinds of germanium avalanche photodiodes with n+-n-p and p+-n structures were devised for improved excess noise and high quantum efficiency performance. Multiplication noise, quantum efficiency, and pulse response were studied and compared with those of the conventional n+-p structure diode. Multiplication noise of the new type of diodes were measured in the wavelength range between 0.63 and 1.52 μm. The effective ionization coefficient ratio of the p+-n diode was lower than unity at a wavelength longer than 1.1 μm and 0.6-0.7 at 1.52 μm, and that of the n+-n-p diode was 0.6-0.7 in the whole sensitive wavelength region. Response times were evaluated by using a mode-locked Nd:YAG laser beam and a frequency bandwidth wider than 1 GHz was estimated. Receiving optical power levels were compared with each other using parameters measured in this study.read more
Citations
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Silicon molecular beam epitaxy
TL;DR: The silicon molecular beam epitaxy (MBE) technique has only been used in silicon device applications in the last 5 years as discussed by the authors, and it is expected that in the near future silicon MBE will be applied to a much wider range of silicon devices including silicon integrated circuits.
Journal ArticleDOI
Receiver design for high-speed optical-fiber systems
TL;DR: In this article, the authors re-examine the optical receiver design in view of these different requirements, namely, high receiver sensitivity, wide dynamic range, transparent to the operating bit rate, unrestricted data format, and fast acquisition time.
Journal ArticleDOI
Noise in an AlGaAs semiconductor laser amplifier
Takaaki Mukai,Yoshihisa Yamamoto +1 more
TL;DR: In this article, the noise characteristics of a Fabry-Perot (FP) cavity type semiconductor laser amplifier, biased at just below its oscillation threshold current, have been studied theoretically and experimentally.
Journal ArticleDOI
2 Gbit/s optical transmission experiments at 1.3 μm with 44 km single-mode fibre
TL;DR: In this article, the authors studied the effect of a low coupling loss of 4 dB between a laser and a single-mode fiber achieved by a mocrolens on the optical receiving level at a 10-9 error rate and no degradation occurred by fibre dispersion.
References
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Journal ArticleDOI
Multiplication noise in uniform avalanche diodes
TL;DR: In this article, the spectral density of the noise generated in a uniformly multiplying p-n junction can be derived for any distribution of injected carriers, and the analysis is limited to the white noise spectrum only, and to diodes having large potential drops across the multiplying region of the depletion layer.
Journal ArticleDOI
Intrinsic Optical Absorption in Single-Crystal Germanium and Silicon at 77°K and 300°K
W. C. Dash,R. Newman +1 more
TL;DR: In this article, the intrinsic absorption spectra of high-purity single-crystal germanium and silicon have been measured at 77\ifmmode^\circ\else\text degree\fi{}K and 300\ifmode^''circ\decrease\textdegree\fi {}K, respectively.
Journal ArticleDOI
Receiver design for digital fiber optic communication systems, II
TL;DR: In this article, it is shown that a proper front-end design incorporates a high-impedance preamplifier which tends to integrate the detector output, and this must be followed by proper equalization in the later stages of the linear channel.
Journal ArticleDOI
Ultimate low-loss single-mode fibre at 1.55 μm
TL;DR: In this article, a very low loss singlemode fiber with a minimum loss of 0.20 dB/km at a wavelength of 1.55 μm is attained; this loss reaches the ultimate lower loss limit of silica-based optical glass fibre.