Photonic generation of microwave signals using dual-wavelength single-longitudinal-mode fiber lasers

Tunable ultra-narrow linewidth microwave generation from a double-loop Brillouin fiber laser

“…The microwave signal generated limits their application in some aspects. And a dual-wavelength output under SLM based on a fiber Bragg grating (FBG) filter is also a possible approach to produce an ultra-narrow linewidth microwave signal [8][9][10]. The frequencies of microwave signals generated by a FBG filter cannot easily achieve a tunable microwave frequency because of the fixed transmission spectrum of the FBG filter.…”

A Stable Dual-wavelength Thulium-doped Fiber Laser at 1.9 μm Using Photonic Crystal Fiber

“…One configuration where dual-wavelength TDFLs operate at 2 μm is considered as an attractive proposition for dual-wavelength laser generation, since most previously reported dual wavelength fiber lasers were operating at the 1.0 μm and 1.55 μm bands. Research efforts associated with this configuration have been additionally driven by an expected broad applicability that includes ranging systems 4 , communication, microwave photonics 5 6 and terahertz generation 7 . Moreover, progress on all-fiber dual wavelength generation from TDFLs is increasingly feasible as 2 μm compatible fiber components become readily available.…”

Photonic analog-to-digital conversion and photonic microwave signal generation

“…A potential application of the generated 10×2 TWIPT is for high-speed optically-sampled ADC systems based on WDD parallel processing. Early photonic techniques to generate CW microwave signals with the aforementioned attributes include optical heterodyning [59][60][61][62][63], external modulation of a laser [64][65][66][67][68][69][70], and heterodyning lasing wavelengths from a dual-wavelength laser [71][72][73][74][75][76]. The principles of operation, governing mathematics, recent developments, and limitations of each of these techniques have been described in Chapter 3.…”

“…Over the last two decades, there has been considerable interest in developing Early photonic techniques to generate high frequency CW microwave signals include optical heterodyning [59][60][61][62][63], external modulation [64][65][66][67][68][69][70] and dualwavelength laser [71][72][73][74][75][76]. As for arbitrary waveform generation, the popular photonic techniques include direct space-to-time (DST) pulse shaping [77][78][79], temporal pulse shaping [80][81][82][83], optical line-by-line pulse shaping [84][85][86][87], and lastly, optical spectral shaping and wavelength-to-time mapping [88][89][90][91][92][93].…”

“…The phase correlation between them is better as compared to two free running CW lasers in the optical heterodyning approach. The key to this approach is a fiber-Bragg grating (FBG) which assists in the filtering of two lasing modes in a ring cavity laser [75,76]. However, the fiber-Bragg gratings are either difficult and complex to fabricate or are expensive, when available commercially.…”