Experimental Demonstration of a Real-Time OFDM System Over 100km SMF Employing Directly Modulated Laser without Optical Amplification

We experimentally demonstrate a real-time QPSK-encoded OFDM long-reach system employing directly modulated laser without optical amplification. After transmitted over 100km SMF with a BER of 3.8×10 −3 , the power penalty is less than 1dB.