Using a 1.2 GHz bandwidth reflective semiconductor optical amplifier with seeding light by 64-quadrature amplitude modulation orthogonal frequency division multiplexing modulation to achieve a <inline-formula><math display="inline" overflow="scroll"><mrow><mn mathvariant="bold">10</mn><mtext>-</mtext><mi>gbits</mi><mo>/</mo><mi mathvariant="normal">s</mi></mrow></math></inline-formula> upstream rate in long-reach passive optical network access

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We use a commercially available 1.2 GHz bandwidth reflective semiconductor optical amplifier (RSOA)-based optical network unit (ONU) to achieve 10-gbits/s upstream traffic for an optical orthogonal frequency division multiplexing (OFDM) long-reach passive optical network (LR-PON). This is the first time the 64-quadrature amplitude modulation (QAM) OFDM format has been applied to RSOA-ONU to achieve a 75 km fiber transmission length. In the proposed LR-PON, the upstream power penalty of 5.2 dB at the bit error rate of 3.8×10−3 is measured by using a 64-QAM OFDM modulation after the 75 km fiber transmission without dispersion compensation.