Abstract
This paper describes the investigation of side-mode injection-locked
Fabry–Pérot laser diode (FP-LD) transmitters for wavelength division
multiplex passive optical network (WDM-PON) applications. We teat the case
that transmitters are injection locked by intensity-modulated downstream signal
light. In this case, an extinction ratio (${\rm Ex}$) of downstream signal light is very
important for both sending and receiving properties, and the ${\rm Ex}$ influences the bit error rate
(BER) property. It is desirable to use downstream light with a high ${\rm Ex}$ for minimizing
the receiver power penalty $\Delta
{P}$ of downstream data. However, the downstream light with
a high ${\rm Ex}$ degrades the locking property, and it results in the BER degradation
of upstream data. This paper clarifies that there is a tradeoff of power penalties $\Delta {P}$ for
up- and downstream data, theoretically. We propose a method to reduce the
penalty $\Delta {P}$ induced by a high ${\rm
Ex}$. Fundamental transmission experiments using a semiconductor
optical amplifier (SOA) confirmed the effectiveness of the proposed method.
We also discuss the proposed method.
© 2009 IEEE
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