Fig. 2From: Research on optical 32QAM-OFDM-PON access scheme with different numbers of sub-carriers using DMT modulationExperimental setup. ECL: external Cavity Laser; PC: polarization controller; EA:electric amplifier; MZM: Mach-Zehnder modulator; OC: optical coupler; SMF: single mode fiber; EDFA: erbium-doped optical fiber amplifier; PD: photodetector; LPF: low pass filterBack to article page