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Experimental Demonstration of Linear Phase Detection

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4 Author(s)
Betts, G.E. ; Photonic Syst. Inc., Billerica ; Krzewick, W. ; Wu, S. ; Yu, P.K.L.

The phase of an optical signal can be linearly converted to voltage by using a receiver incorporating an electrooptic feedback loop. We demonstrate such a receiver in an externally modulated analog link, showing 12-dB improvement in input third-order intercept point with no second-order distortion. Feedback loop gain is achieved without electronic amplification, using only electrooptic and passive components.

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 13 )