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Distortion characteristics of optical directional coupler modulators

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2 Author(s)
Halemane, T.R. ; AT&T Bell Lab., Holmdel, NJ, USA ; Korotky, S.K.

A theoretical analysis is made of the nonlinearities of the intensity modulation response of the optical directional coupler, as a function of bias point for the case of phase-mismatch modulation, and the results are compared with those of interferometric modulators. The interferometric, standard 2×2 directional coupler and the 1×2 y-fed directional coupler modulators are shown to exhibit very similar intermodulation distortion effects. At 4% optical modulation depth, the third-order intermodulation products are -74 dB, -72 dB, and -73.6 dB respectively, below the carrier level

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:38 ,  Issue: 5 )

Date of Publication:

May 1990

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