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Photodetector nonlinearity limitations on a high-dynamic range 3 GHz fiber optic link

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3 Author(s)
Williams, K.J. ; Naval Res. Lab., Washington, DC, USA ; Nichols, L.T. ; Esman, R.D.

The performance of a dc to 3 GHz externally modulated link utilizing balanced high-power photodetection is presented. Nonlinearity measurements of high power photodiodes show 1 dB compression currents in excess of 55 mA and an output third-order intercept point of +32 to +34 dBm. These high current photodetectors permit the use of high power lasers as external modulator sources for low noise fiber optic links with only small degradations in the predicted link dynamic range. An externally modulated link with a 240 mW Nd:YAG laser, a dual-output 4-V V, (dc) modulator, and balanced 100 mA total photocurrent yielded a link noise figure from 15.5 to 17.5 dB, a spur-free dynamic range of 119.5 dBHz2/3, and a 1-dB compression dynamic range of 168.4 dBHz

Published in:

Lightwave Technology, Journal of  (Volume:16 ,  Issue: 2 )

Date of Publication:

Feb 1998

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