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Resonant Faraday Effect and Group Delay Time Dispersion of Er+3 doped Optical Fiber Amplifiers

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The Faraday rotation is an important effect for realizing non-reciprocal functions in photonic systems. The figure of merits for Faraday rotators is limited by absorption of the dominant transition so that we can utilize larger Verdet constants due to the resonant Faraday effect if we can compensate the material loss. From this view-point the Faraday rotation of EDFA is interesting. And also, in the characterization of the ED FA, the group delay time dispersion is one of the most fundamental issues for the femto-second soliton amplification and the distortion in optical CATV analog video transmission systems. [1,2] Romagnoli reported the estimation of the group delay dispersion of EDFA using the gain dispersion based on the Krammers-Kronig dispersion relation.[1] The direct measurement of the EDFA group delay dispersion is fairly difficult even using optical network analyzer. [3]

© 1993 Optical Society of America

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