P. Goldgeier et G. Eisenstein, Broad-band microwave-optical fiber links transmitting over long distances with optical amplification, IEEE MICR G, 9(1), 1999, pp. 40-42
We describe long-distance analog microwave-fiber optic links with bandwidth
s larger than six and a half octaves at an upper frequency in the 1.5-2 GHz
range. The links exhibit highly linear performance with harmonic and inter
modulation distortions determining the overall spurious free dynamic ranges
. Two configurations are presented, each capable of overcoming limitations
imposed by fiber nonlinearities and each employing a custom optical amplifi
er which maintains a low-noise figure under saturated conditions. For fiber
lengths of tens of kilometers, representing losses of 10-16 dB, the basic
links have a noise figure of 38 dB and second and third order spurious free
dynamic ranges of 103 dB/Hz(1/2) and 105 dB/Hz(2/3). respectively, over th
eir entire bandwidth.