Abstract
Narrow linewidth microwave signals generated from a heterodyne detection configuration of a dual-wavelength (DW) single-frequency highly Er3+/Yb3+ co-doped phosphate fiber laser is presented. The oscillating cavity of the fiber laser consists of a dual-channel narrow-band fiber-Bragg-grating (DC-NB-FBG), a 0.7-cm-long Er3+/ Yb3+ co-doped phosphate fiber and a wideband FBG (WB-FBG). The wavelength selecting gratings are spatially separated to create partially separated resonant cavities. Highly Er3+/Yb3+ co-doped phosphate fiber ensures that the mode competition is relatively weak under low pump power. DW single-frequency lasing with laser linewidths of 3 kHz is achieved. A 12.014-GHz microwave signal with a 3-dB linewidth of 3 kHz is obtained from the heterodyne detection of the DW fiber laser.
Highlights
Unlike traditional schemes of generating microwave signals with electric circuits and transmitting through coaxial cables, photonic generation of microwave signals offers a simple way of generating optical carrier signals and transmitting it via low-loss, inexpensive optical fibers over large distances
We report the experimental demonstration of photonic generation of microwave signals from a dual-wavelenthg single-frequency highly Er3þ=Yb3þ co-doped phosphate fiber laser
The laser cavity is established by a dual-channel narrow-band fiber-Bragg-grating (DC-narrow-band FBGs (NB-FBG)) (4.0 cm) and a wideband FBG (WB-FBG) (2.5 cm) that are fusion spliced to the end facets of a 0.7 cm-long homemade high gain Er3þ=Yb3þ co-doped phosphate fiber
Summary
Unlike traditional schemes of generating microwave signals with electric circuits and transmitting through coaxial cables, photonic generation of microwave signals offers a simple way of generating optical carrier signals and transmitting it via low-loss, inexpensive optical fibers over large distances. There are many photonic techniques to generate microwave signals; for example, microwave signal generation based on external modulation [4], [5], optical heterodyne detection of two phase locked lasers [6], the direct photodetection of the output from a mode-locked laser [7], the dual-wavelength single-longitudinal-mode (DW-SLM) laser sources [8]–[18]. The former three techniques require external microwave sources to operate or specially. The spacing of the laser wavelengths was determined by the birefringence of the PM fiber or gain fiber, making it hard to achieve tunable or switchable microwave-signal output
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