Abstract

This paper presents a $\lambda$-tunable optical network unit (ONU) burst-mode transmitter (B-Tx) with high output power and low burst-off-level power for high-split-number time and wavelength division multiplexing passive optical networks (TWDM-PONs). The proposed ONU B-Tx utilizes a burst-mode booster semiconductor optical amplifier (SOA) with a control technique for reverse bias voltage that creates an optical power absorption effect in the burst-off-level state. This paper introduces the design of the bias-voltage-state control circuit, simulations of control-circuit operation, evaluations of the static optical power-absorption effect, and burst-mode operation performance in the booster SOA operated by reverse bias voltage. High output power of over $+7.4\mathrm{dBm}$ and low burst-off-level power of under $-73.4\mathrm{dBm}/15\mathrm{GHz}$ are successfully achieved in all upstream channels. Crosstalk penalty measurements confirm a very low penalty of under 0.1 dB, which leads to a 256 split-number TWDM-PON.

© 2018 Optical Society of America

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