Corrections to "A novel high-speed and wavelength insensitive Y-branch modulator withreduced and controllable chirp"

In the above-named letter [ibid., vol. 11, pp. 1129??1131, Sept. 1999] Fig. 3 was incorrect. The correct figure showing the chirp measurement at 2.5 Gb/s of the Y-branch modulator along with the data pattern is shown in the revised Fig. 3. The realtime dynamic chirp measured in frequency for the unbiased and biased ports are shown in Fig. 3(a) and (b), respectively. The peak-to- peak frequency deviation in the unbiased port is only 0.2 GHz, whereas the peak-to-peak frequency deviation in the biased port is 3 GHz.