We discuss wishes for next generation access networks and proposed and demonstrated WDM-PONs based on wavelength locked F-P LDs. These WDM-PONs guarantee color-free (or wavelength independent) operation of ONTs and OLT transceivers. The scalability of the WDM-PON is also investigated in terms of transmission length, split ratio, and transmission speed.
We demonstrate an optimization method of the decision threshold level in optical receivers for WDM-PONs based on wavelength locked Fabry-Perot laser diodes. The decision threshold level is controlled by the average optical power. For the WDM-PON with 100 GHz channel spacing, we reduced required injection power for color-free operation by 6 dB using the proposed method.
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