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Linearization of Phase-Modulated Analog Optical Links Employing Interferometric Demodulation

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3 Author(s)
McKinney, J.D. ; U.S. Naval Res. Lab., Washington, DC ; Colladay, K. ; Williams, K.J.

We present a linearized phase-modulated analog photonic link that utilizes parallel interferometric demodulation to suppress the third-order intermodulation distortion present in the link. By utilizing two parallel interferometers with different differential delays, we are able to balance the third-order distortion in the output photocurrent and achieve a fifth-order limited link response. We demonstrate shot noise-limited spurious-free dynamic ranges of ~ 130 dB (1-Hz bandwidth) at ~ 1 GHz for a total DC photocurrent Idc~ 8 mA and ~ 131 dB (1-Hz bandwidth) at ~ 5 GHz for a total DC photocurrent Idc ~ 7 mA . These results represent a nearly two order-of-magnitude improvement in dynamic range over conventional intensity- or phase-modulated analog photonic links for a fixed received photocurrent.

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Lightwave Technology, Journal of  (Volume:27 ,  Issue: 9 )