A Radio-Over-Fiber System With Frequency 12-Tupling Optical Millimeter-Wave Generation to Overcome Chromatic Dispersion

An optical millimeter-wave generation scheme based on two parallel dual-parallel Mach–Zehnder modulators and polarization multiplexing

“…Instead of optical filtering, the undesired optical sidebands also can be suppressed by setting specific modulation index (MI). For example, two parallel dual-parallel MZMs (DPMZMs) scheme was proposed to generate frequency 16-tupling signal when MI was equal to 5.520 or 8.654 [16], three parallel MZMs scheme was proposed to achieve a FMF as high as 18 when MI was equal to 6.380 or 9.761 [17], and integrated nested MZM scheme was proposed to generate 12-tupling signal when MI was equal to 5.136 [18]. However, the fixed MI means that the performance is sensitive to the RF driving voltage and thus, system has a poor stability against the RF voltage deviation [16,17].…”

10-Gb/s wireless signal transmission over a seamless IM/DD fiber-MMW system at 92.5 GHz

“…This is due to the effect of fiber dispersion on the transmitted signal. Though the use of only two sidebands in the optical MMW signal without any carrier signal to carry the RF signal can minimize the effect of fiber dispersion, the bit-walk-off effect due to the different velocities of the sidebands put some limitation on the length of fiber cable [20]. Even with this effect, we confirm that a transmission over a 7-km fiber meets the requirement of signal performance.…”

Frequency16-tupled optical millimeter wave generation using dual cascaded MZMs and 2.5 Gbps RoF transmission

“…However, an optical frequency multiplication technique with highest frequency multiplication factor is highly desirable to reduce the required local oscillator (LO) frequency. Multiplication factor of 4, 6, 8, and 12 has been reported [7]- [11] which required high frequency LO at the central station. A frequency 16 tupling has been proposed using two parallel dual parallel MZMs consisting four sub MZMs [12].…”