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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