High-Resolution Optical Frequency Synthesis Using an Integrated Electro-Optical Phase-Locked Loop

Optical phase-locked loop phase noise in 5G mm-wave OFDM ARoF systems

“…As the OPLL described in the previous section is based on DFB lasers then it is necessary to operate the feedback on the laser gain section. Yet, it is well-known that this intrinsically limits the OPLL BW [31]. Indeed, a competition between thermal and carrier tuning of the laser frequency takes place in the DFB laser and the switch between them occurs in the MHz range, reversing the sign of the feedback [32,33].…”

A Frequency Multiplication Method Based on Extracting Harmonic From Narrow Pulse

“…In that prototype circuit, a 10MHz clock signal is multiplied by 20 using a phase locked loop within a DDS chip in order to achieve clock speeds suitable for RF generation. In [15], a partially integrated optical frequency synthesizer is reported, where a stable and low-noise frequency comb is used as the optical reference. In their design architecture, a heterodyne integrated Electro Optical Phase Locked Loop (EOPLL) phase-locks the tunable laser (TL) to the selected comb tooth.…”