A 1Gb/s silicon photo-receiver in standard CMOS for 850-nm optical communication

A monolithic silicon CMOS optoelectronic integrated circuit (OEIC) was designed and fabricated with standard 0.6 mu m CMOS technology. This OEIC circuit consisted of an integrated double photodiode detector (DPD) and a preamplifier. The DPD detector exhibited high bandwidth by screening the bulk-generated diffusion carriers and suppressing the slow diffusion tail effect. The preamplifier exploited the regulated cascode (RGC) configuration as the input stage of receiver, thus isolating the influence of photodiode capacitance and input parasitic capacitance on bandwidth. Testing results showed that the bandwidth of OEIC was 700MHz, indicating the bit rate of 1Gb/s was achieved.

钨丝掩模二次倾斜离子注入850 nm室温连续垂直腔面发射激光器

采用钨丝做掩模,进行倾斜的离子注入优化电流限制区,制作出室温连续的垂直腔面发射激光器件.该器件的最低阈值电流为1.4 mA,串联电阻约207 Ω, 输出光功率超过1 mW.

Tephra-linked peat humification records from Irish ombrotrophic bogs question nature of solar forcing at 850 cal. yr BC.

This paper investigates evidence for palaeoclimatic changes during the period ca. 1500-500 cal. yr BC through peat humification studies on seven Irish ombrotrophic bogs. The sites are well-correlated by the identification of three mid-first millennium BC tephras, which enable the humification records at specific points in time to be directly compared. Phases of temporarily increased wetness are suggested at ca. 1300-1250 cal. yr BC, ca. 1150-1050 cal. yr BC, ca. 940 cal. yr BC and ca. 740 cal. yr BC. The last of these is confirmed to be synchronous at five sites, suggesting external forcing on a regional scale. The timing of this wet-shift is constrained by two closely dated tephras and is demonstrated to be distinct from the widely reported changes to cooler/wetter conditions associated with a solar minimum at 850-760 cal. yr BC, at which time the Irish sites appear instead to experience drier conditions. The results suggest the possibility of either non-uniform responses to solar forcing in northwest Europe at this time, or the existence of unrelated climate events in the early first millennium BC. The findings caution against the correlation of loosely dated palaeoclimate data if the effects of forcing mechanisms are to be understood.

New York, arrivée des corps de 138 marins américains qui avaient été enterrés à Brest, C.N. USA [cliché Central News] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59501

Le ciel et l'enfer : féerie mêlée de chants et de danses, en 5 actes et 20 tableaux. [suivi de] Souvent femme varie... : comédie en un acte, en prose. Livr. 138 / de MM. Hippolyte Lucas et Eugène Barré [et Victor Hugo] ; [musique nouvelle de M. Amédée Artus]par M. Amédée Achard

Collection : Théâtre contemporain illustré ; 138e et 139e livraisons

Resolución No. 138: Por la cual se rechaza un recurso de reposición y en subsidio de apelación

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