title: Photonic generation of a microwave signal by incorporating a delay interferometer and a saturable absorber.
abstract: A novel approach to generate microwave signals is presented by employing a dual-wavelength erbium-doped fiber ring laser. By using a delay interferometer as a comb filter cascaded with a tunable bandpass filter and a saturable absorber formed by an unpumped polarization-maintaining erbium-doped fiber, a stable wavelength-tunable dual-wavelength single longitudinal-mode laser is achieved. A microwave signal at 20.07 GHz with a linewidth of <25 kHz is demonstrated by beating the two wavelengths at a photodetector.
authors.affiliation: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology,Wuhan 430074, China.
authors.forename: Guojie
authors.initials: G
authors.lastname: Chen
authors.forename: Dexiu
authors.initials: D
authors.lastname: Huang
authors.forename: Xinliang
authors.initials: X
authors.lastname: Zhang
authors.forename: Hui
authors.initials: H
authors.lastname: Cao