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Photonic RF phase shifter and tunable photonic RF notch filter

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2 Author(s)
Chan, E.H.W. ; Sch. of Electr. & Inf. Eng., Univ. of Sydney, NSW, Australia ; Minasian, R.A.

A new photonic RF phase shifter structure for phased array antennas is presented. It is based on a single dual-output modulator and two optical switches and optical attenuators. This can realize continuous phase shifting of 0°-360° without altering the signal amplitude. It has the advantages of wide bandwidth, fast response time, and fine tuning resolution. Experimental results demonstrate phase shifts over a 360° phase range, with RF signal power changes of less than 0.2 dB, which is in close agreement with predictions. A tunable photonic RF notch filter, which is based on the new phase shifter, is also presented. Experimental results demonstrate continuous tuning of the photonic notch filter over a wide tuning range, which covers the full free spectral range, which is in good agreement with predictions.

Published in:

Lightwave Technology, Journal of  (Volume:24 ,  Issue: 7 )

Date of Publication:

July 2006

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