Abstract
An external optical modulation using absorption s in a Fabry-Perot laser
diode (FP-LD), has been proposed and experimentally demonstrated for multicasting in
a WDM-PON. The center wavelengths of absorption s in an FP-LD move to
short-wavelength rapidly by only a small current (~1 mA) injection. If the current
injection is stopped, the s move back to the original position. Such a movement of
the s can make the FP-LD act as an external optical modulator, which is found to
modulate at a maximum modulation speed of 800 Mbps or more. For a multicasting
transmitter in a WDM-PON, the proposed modulator can be cost-effectively applied to
a multi-wavelength laser source with the same periodicity of the longitudinal mode.
Instead of the multi-wavelength laser source, tunable-LDs are used for experiments.
The 32 channel multicasting system with the proposed modulator has been
demonstrated, showing power penalties of 1.53~4.15 dB at a bit error rate of
10<sup>-9</sup> with extinction ratios better than 14.5 dB at 622
Mbps.
© 2011 Optical Society of Korea
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