System for precise dissemination of frequency standard via optical fiber

Abstract

A precise frequency dissemination system using optical fiber is studied. The purpose of the system is to transmit a frequency standard with little deterioration to many distant users. It is composed of a phase compensation transmitter, bidirectional optical amplifiers, optical amplified distributor, and receiver. The goal of the system is to achieve stable transmission of hydrogen maser-class signals. For short-term stability, the required optical received power to realize an Allan deviation of 1 × 10 -13 (average time of 1 s) is shown. For long-term stability, a new compensation method using a third wavelength transmission is effective to suppress phase fluctuation induced by temperature changes in the fiber. Experimental results show a stability of 8 × 10 -17 at 10 5 s in a fiber link of 160 km in all with one bidirectional amplifier. © 2012 Wiley Periodicals, Inc. Electron Comm Jpn, 95(3): 45-54, 2012; Published online in Wiley Online Library (wileyonlinelibrary.com).