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

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...

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Bibliographic Details
Published in:Journal of lightwave technology 1998-02, Vol.16 (2), p.192-199
Main Authors: Williams, K.J., Nichols, L.T., Esman, R.D.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Current measurement
Dynamic range
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Fiber lasers
Laser noise
Miscellaneous
Optical and optoelectronic circuits
Optical fibers
Optical noise
Photodetectors
Photodiodes
Power lasers
Power measurement
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Summary: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 dBHz/sup 2/3/, and a 1-dB compression dynamic range of 168.4 dBHz.
ISSN:0733-8724
1558-2213
DOI:10.1109/50.661009