Jh. Schaffner et al., SPUR-FREE DYNAMIC-RANGE MEASUREMENTS OF A FIBER OPTIC LINK WITH TRAVELING-WAVE LINEARIZED DIRECTIONAL COUPLER MODULATORS, IEEE photonics technology letters, 6(2), 1994, pp. 273-275
Two-tone testing was performed on a laboratory fiber optic link with L
iNbO3 traveling wave linearized directional coupler modulators. The th
ird-order distortion was measured at 500 MHz and 1000 MHz and the spur
-free dynamic range was determined. Two modulator configurations, with
either one or two passive bias sections, were tested and the results
were compared with measurements of simple directional coupler modulato
rs. A 9.5-11 dB improvement in the dynamic range was found in the link
s employing the linearized modulators.