Abstract
We generate the phase-modulated signal by utilizing the chirp characteristics of the directly-modulated reflective semiconductor optical amplifier (RSOA) for the cost-effective realization of a long-reach wavelength-division-multiplexed passive optical network (WDM PON). We first investigate the relation between the amplitude and phase modulation indices in a directly-modulated RSOA and optimize these modulation indices to maximize the symbol distance on the constellation diagram. The results show that, by operating the RSOA under this optimum condition, we can achieve the excellent receiver sensitivity of -49.8 dBm at 1.25 Gb/s. We implement a long-reach WDM PON by using the phase-modulated RSOAs and self-homodyne receivers, and demonstrate the error-free transmission of 1.25-Gb/s signal over a 110-km long link without using any optical amplifiers.
Highlights
The wavelength-division-multiplexed passive optical network (WDM PON) based on the reflective semiconductor optical amplifier (RSOA) is one of the most promising candidates for the next-generation broadband access network [1,2,3]
The seed light provided from the central office (CO) is directly modulated by the RSOA located at the optical network units (ONUs), and sent back to the CO as an upstream signal
We have demonstrated a long-reach WDM PON implemented by using the PSK modulated RSOAs and self-homodyne receivers
Summary
The wavelength-division-multiplexed passive optical network (WDM PON) based on the reflective semiconductor optical amplifier (RSOA) is one of the most promising candidates for the next-generation broadband access network [1,2,3]. The maximum reach of this network is often restricted by the power budget of the upstream signal To overcome this limitation by improving the receiver sensitivity, we have recently demonstrated an RSOA-based WDM PON implemented by using a self-homodyne receiver [4,5]. The results show that we can transmit the 1.25-Gb/s upstream signal, obtained by directly modulating an RSOA, over 100 km of single-mode fiber without using any optical amplifiers In this demonstration, we could not maximize the system’s performance by utilizing a large extinction ratio due to the large chirp of the RSOA (i.e., the mark symbol in the constellation diagram becomes blurred as we increase the extinction ratio). We demonstrate an RSOA-based WDM PON having the maximum reach of 110 km without using any optical amplifiers
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