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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Submicrosecond all-optical switching in neodymium-doped fiber

Robert W. Sadowski, Michel J. F. Digonnet, R. H. Pantell, H. J. Shaw

Published Feb 15, 1994• 5 citations
Publisher

Abstract

Sub-microsecond all—optical switching in neodymium-doped fiberR. W. Sadowski, M. J. F. Digonnet, R. H. Pantell and H. J. ShawEdward L. Ginzton LaboratoryStanford UniversityStanford, CA 94305ABSTRACTWe report on optically induced, sub-microsecond optical switching in an elliptical core neodymiumdoped, two-mode fiber. The improved response time of this switch, which is three orders of magnitude

DOI
10.1117/12.168600

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Sub-microsecond all—optical switching in neodymium-doped fiberR. W. Sadowski, M. J. F. Digonnet, R. H. Pantell and H. J. ShawEdward L. Ginzton LaboratoryStanford UniversityStanford, CA 94305ABSTRACTWe report on optically induced, sub-microsecond optical switching in an elliptical core neodymiumdoped, two-mode fiber. The improved response time of this switch, which is three orders of magnitude
We report on optically induced optical switching of a 632.8-nm signal in a Nd3+-doped, two-mode fiber based on a nonlinearity resonantly enhanced by the dopant. A fast, 0.38-μs component was observed in the switched signal, which we believe is due to cross relaxation between clustered ions. We demonstrated a 600-kHz switch in a 1.14-m elliptical-core fiber with 0.31 μJ of launched 807-nm pump energy. Information about cluster size and speed of the cross-relaxation process is inferred from the switch dynamics.
We report low loss, low pump power, optical-optical switches in rare-earth-doped fibers based on the third-order optical nonlinearity resonantly enhanced by the dopant. In a 0.95-m Er- doped two-mode fiber switch pumped with a 1.48-micrometers diode laser, the absorbed pump power required for switching a 906-nm signal was 8 mW, for a signal loss of only 0.25 dB. This is an enhancement by a factor of 6200 in power-length product over undoped silica. The phase shift was found to be due in part to a non-resonant contribution, thought to arise from a strong UV-VUV transition, and in part to a resonant term from the 980-nm transition. In a 0.98-m Nd-doped, elliptical-core, two-mode fiber switch, switching of a 632.8-nm signal was achieved with only 6.6 mW of absorbed power at 900 nm. The dynamic response of the switch was found to have two components, a slow component equal to the metastable level lifetime (approximately equals 380 microsecond(s) ) and a fast component (approximately equals 2 microsecond(s) ). The latter is believed to arise from rapid cross-relaxation between paired ions, a mechanism which shows promises for low- power, microsecond switching in fibers.