High-purity millimetre-wave photonic local oscillator generation and delivery

Photonic Components for Analog Fiber Links

“…In fact, the performance of these methods in terms of phase noise is comparable to the OPLL system. A key advantage of these approaches in [26,27] is that an optical modulator with a maximum operating frequency of 15 GHz can generate a millimeter-wave signal up to 60 GHz.…”

“…In addition to the techniques using optical injection locking and OPLL, high-quality microwave signals can also be generated based on external modulation [25][26][27]. A method to generate a mm-wave signal using an external optical modulation technique was first proposed in 1992 [25].…”

Low-Cost, Continuously Tunable, Millimeter-Wave Photonic LO Generation Using Optical Phase Modulation and DWDM Filters

“…When the frequency moves into the MMW band, one can adopt optical filters to select the wanted sidebands to enhance the MMW generation. Different filtering configurations, such as cascading the phase modulator with a polarizer [5], or by using an optical loop mirror, a Faraday mirror, a narrowband Fiber Bragg Grating (FBG) [6,7], an Arrayed Waveguide Grating (AWG) or a Fabry Perot filter [8,9] have been implemented previously.…”

“…Nevertheless when the MMW frequency is tuned, the FBGs need to be adjusted accordingly. In [8], where a FP filter is used, the tuning range is limited to a few hundreds of MHz due to the requirement of high Finesse in the FP filters in order to suppress the unwanted sidebands.…”

Photonic generation of amplitude- and phase-modulated microwave signals with frequency and modulation bit-rate tunability

“…In communication systems, the electrical generation of radio signals at MMW frequencies is expensive and energy inefficient, and the distribution of such signals via wireless or coaxial methods is highly challenging when compared with optical methods [5] . Moreover, the electrical modulation of a baseband data to a high-frequency microwave requires a high-frequency modulator that is difficult to manufacture.…”