Institution
Bell Labs
Company•
About: Bell Labs is a based out in . It is known for research contribution in the topics: Laser & Optical fiber. The organization has 36499 authors who have published 59862 publications receiving 3190823 citations. The organization is also known as: Bell Laboratories & AT&T Bell Laboratories.
Topics: Laser, Optical fiber, Amplifier, Semiconductor laser theory, Signal
Papers published on a yearly basis
Papers
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TL;DR: The effect of frequency chirping on the performance of optical communication systems is analyzed theoretically using a simple but realistic model for the chirped pulses emitted by a directly modulated semiconductor laser and the effect of pulse-edge sharpness is investigated by considering the propagation of super-Gaussian chirps in a dispersive single-mode fiber.
Abstract: The effect of frequency chirping on the performance of optical communication systems is analyzed theoretically using a simple but realistic model for the chirped pulses emitted by a directly modulated semiconductor laser. The effect of pulse-edge sharpness is investigated by considering the propagation of super-Gaussian chirped pulses in a dispersive single-mode fiber. The results are presented using the parameter values appropriate for a 1.55-μm optical communication system employing conventional silica fibers and are in qualitative agreement with the reported experimental observations.
61 citations
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TL;DR: A framework for simulating large-scale networks, decoupling the influence of breadth and depth is developed and it is found that a Poisson stream is a good approximation to a superposition of many CBR streams with differing phases and bandwidths.
Abstract: We investigate the performance of CBR traffic in the context of large-scale networks, where many connections and switches coexist and interact. We develop a framework for simulating such networks, decoupling the influence of breadth and depth. Our results are briefly as follows: we found that a Poisson stream is a good approximation to a superposition of many CBR streams with differing phases and bandwidths. Delays incurred by a reference stream with cross traffic composed of many CBR streams with different bandwidths and phases do not exceed a few cell times even under heavy load, which means that buildout buffers of 10 to 20 cells seem to be sufficient after traversing 20 switches. CBR traffic can be efficiently served by the first come first served (FCFS) scheduling discipline, which has the least implementation cost. Surprisingly, the round robin (RR) and weighted round robin (WRR) disciplines perform worse than the FCFS, despite their greater implementation complexity. We also compare an analytical approximation method based on the multiclass parametric decomposition method, with the simulation results and found it to be suitable for estimating the end-to-end delays for the FCFS discipline.
61 citations
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TL;DR: This paper proposes a simplification of Karzanov's algorithm that is easier to implement than Malhotra, Kumar and Maheshwari's method.
61 citations
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11 Nov 1974TL;DR: In this article, a variety of arrangements for tapping a portion of the signal power from an optical fiber waveguide without requiring that the fiber be terminated or broken are described, and a photodetector disposed adjacent to the dielectric body couples power out of the fiber provided its index of refraction is approximately equal to, or greater than, the fiber cladding material.
Abstract: There is disclosed a variety of arrangements for tapping a portion of the signal power from an optical fiber waveguide without requiring that the fiber be terminated or broken. Power is coupled out of the fiber waveguide, which typically includes an inner core surrounded by a lower refractive index outer cladding, by disposing a dielectric body in a coupling relationship with an intermediate length of the fiber from which all or most of the cladding has been removed or, alternatively, which is bent to cause a portion of the power to radiate out of the inner core into the outer cladding of the fiber. The dielectric body couples power out of the fiber provided its index of refraction is approximately equal to, or greater than, that of the fiber cladding material. The power coupled out by the dielectric body is converted to a representative electrical signal by a photodetector disposed adjacent to the dielectric body.
61 citations
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21 May 1995TL;DR: Efficient VΣS schemes for exponentiation based signatures and discrete log based signatures are presented that can tolerate the malicious (Byzantine) failure of the sharer and a constant fraction of the proxies.
Abstract: We introduce Verifiable Signature Sharing (VΣS), a cryptographic primitive for protecting digital signatures. VΣS enables the holder of a digitally signed document, who may or may not be the original signer, to share the signature among a set of proxies so that the honest proxies can later reconstruct it. We present efficient VΣS schemes for exponentiation based signatures (e.g., RSA, Rabin) and discrete log based signatures (e.g., ElGamal, Schnorr, DSA) that can tolerate the malicious (Byzantine) failure of the sharer and a constant fraction of the proxies. We also describe our implementation of these schemes and evaluate their performance. Among the applications of VΣS is the incorporation of digital cash into multiparty protocols, e.g., to enable cash escrow and secure distributed auctions.
61 citations
Authors
Showing all 36526 results
Name | H-index | Papers | Citations |
---|---|---|---|
Yoshua Bengio | 202 | 1033 | 420313 |
David R. Williams | 178 | 2034 | 138789 |
John A. Rogers | 177 | 1341 | 127390 |
Zhenan Bao | 169 | 865 | 106571 |
Stephen R. Forrest | 148 | 1041 | 111816 |
Bernhard Schölkopf | 148 | 1092 | 149492 |
Thomas S. Huang | 146 | 1299 | 101564 |
Kurt Wüthrich | 143 | 739 | 103253 |
John D. Joannopoulos | 137 | 956 | 100831 |
Steven G. Louie | 137 | 777 | 88794 |
Joss Bland-Hawthorn | 136 | 1114 | 77593 |
Marvin L. Cohen | 134 | 979 | 87767 |
Federico Capasso | 134 | 1189 | 76957 |
Christos Faloutsos | 127 | 789 | 77746 |
Robert J. Cava | 125 | 1042 | 71819 |