We propose and demonstrate an
external optical modulation method based on
TE/TM-mode absorption nulls in a Fabry-
Perot laser diode (FP-LD). The center
wavelength of the absorption nulls are rapidly
moved to short-wavelength by a small current
change from 0 to ~1 mA in the FP-LD, which
can modulate optical signal with more than 10
dB of extinction ratio. Non-inverting and
inverting data signals are made by TE- and
TM-mode absorption nulls at 155.52 Mbps
and BERs for the signals are measured,
respectively.