Tunable optical delay-line using an optical frequency shifter with a single-sideband modulator

High spectral efficiency coherent optical OFDM transmission

“…1(a) shows the architecture of the RFS consisting of a closed fiber loop, an IQ modulator, and optical amplifiers to compensate the frequency conversion loss. The IQ modulator is driven with two equal but 90 degree phase shifted RF tones through I and Q ports, to induce a frequency shifting to the input optical signal [19]. As shown in Fig.…”

“…To replicate uncorrelated multiple OFDM bands using RFS is thus an extremely useful technique as it does not require duplication of the expensive test equipments including arbitrary waveform generators (AWG) and optical IQ modulators, etc. The RFS has been proposed and demonstrated for a tunable delay, but with only one tone being selected and used [19]. We here extend the application of RFS for multi-tone generation, or more precisely, for bandwidth expansion of uncorrelated multi-band OFDM signal.…”

Optical FSK/IM Signal Generation Using an Integrated Optical FSK Modulator

“…1. The device structure is almost the same in the SSB modulator, but the FSK modulator has an electrode (RF C ) for high-speed FSK signal, instead of an dc-bias electrode in the SSB modulator [6,7]. When we apply a pair of rf-signals, which are of the same frequency f m and have a 90 • phase difference, to the electrodes RF A and RF B , frequency shifted lightwave can be generated at the output port of the modulator.…”

“…Recently, however, we reported wavelength conversion by using an optical single-sideband (SSB) modulator consisting of four optical phase modulators [6,7]. The wavelength of the output lightwave depends on rf-signal frequency and dc-bias voltage fed to the modulator, which can be electronically controlled.…”

LiNbO 3 high-speed optical FSK modulator

“…Recently, however, we reported wavelength conversion using an optical single-sideband (SSB) modulator consisting of a pair of Mach-Zehnder structures [6,7]. The wavelength of the output lightwave depends on RF-signal frequency and DC-bias voltage fed to the modulator, which can be electronically controlled.…”