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Electronic and Optical Units for Physical Research Equipment E. Atkin1, V. Chernikov2, Yu. Dmitriev2, I. Ilyushchenko1, Yu. Volkov1 1MEPhI, Moscow, Russia The characteristics of a high-speed optical fiber channel for analog signal transmission are presented. The channel consists of a wide-band transmitting module, a single-mode optical fiber (100m long) and a high-speed photoreceiving unit. The latter contains a high-speed photodiode (diameter of sensitive pad equaling 0,1 mm) and two UHF gain stages with a bandwidth of 2 GHz. An optoelectronic block registering the light burst, emerging in scintillation fiber detectors, is also considered. A part of that block are the solid-state electron multipliers (SSEM), being microcell photodiodes with Geiger amplification [1]. The design of the created model is described, the optical part of which contains a collimator, plastic scintillation fibers, a unit of SSEM fixation and a coaxial cable. The characteristics of the finished block of preliminary signal processing are considered, particularly of an 8-channel unit, containing a series connection of amplifiers-shapers, implemented with Russian ICs [2]. The rise-time for the analog part is within 15 nsec at a gain of 43 dB, power consumption does not exceed 200 mW per channel. Schematic circuits and mechanical designs of preliminary high-speed preamps, built with the commercial INA-51063 ICs, are presented. Their gain equals 100, bandwidth – 1,5 GHz, output signal amplitude – 1,5 V. [1] B.Dolgoshein.: Silicon photomultiplier demonstrates
its capabilities, International Journal of High-Energy Physics. CERN
COURIER, v.43, n2, March 2003, p.8. |