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. 2014 Aug 21;4:6156. doi: 10.1038/srep06156

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(RF: radio frequency; PS: phase shifter; PPG: programmable pulse generator; EA: electrical amplifier; ECL: external cavity laser; MZM: Mach–Zehnder modulator; I/Q Mod.: In-phase and quadrature modulator; PM-TOF: polarization-maintaining tunable optical filter; PM-OC: polarization-maintaining optical coupler; T1 ~ T4: tunable optical delay-line consists of fixed fiber jumper and manually tunable optical time delay; ATT: tunable attenuator; LO: local oscillator).