Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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External Optical Modulator Using a Low-cost Fabry-Perot LD for Multicasting in a WDM-PON

  • Lee, Hyuek-Jae (Division of Information & Communication Engineering, Kyungnam University)
  • Received : 2011.06.17
  • Accepted : 2011.09.05
  • Published : 2011.09.25
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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 $10^{-9}$ with extinction ratios better than 14.5 dB at 622 Mbps.

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References

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