Reflective semiconductor optical amplifier (RSOA), RSOA module having the same, and passive optical network using the same

A passive optical network (PON) using a reflective semiconductor optical amplifier (RSOA), the PON comprising:

• a central office comprising a plurality of first optic sources transmitting a downstream signal and a plurality of first receivers receiving an upstream signal;
• at least one optical network terminal (ONT) comprising a second receiver receiving the downstream signal and an RSOA which receives the downstream signal,
• remodulates the downstream signal into the upstream signal, and
• transmits the upstream signal in loopback mode;
• and
• a remote node interfacing the central office with the ONT,
• wherein the upstream signal and the downstream signal are transmitted between the remote node and the ONT via a single optical fiber, and
• wherein the RSOA comprises:
• an active region performing amplification;
• a p-type electrode supplying current to the active region;
• an anti-reflective coating facet through which a signal is input and output;
• and
• a high-reflective coating facet reflecting a signal,
• wherein the anti-reflective coating facet and the high-reflective coating facet are formed at both ends, respectively, of the RSOA;
• and
• the p-type electrode is divided into a first portion and a second portion with a predetermined gap between the two portions.