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An equal-amplitude higher-order optical pulse train is experimentally demonstrated based on a rational harmonic mode-locked (RHML) fiber laser incorporating a Mach-Zehnder interferometer (MZI) filter to effectively suppress the low-order harmonics.
All-optical clock recovery is demonstrated for non-return-to-zero amplitude-shift-keying (NRZ-ASK) signals with various bit-rates using a passive asymmetric Mach-Zehnder interferometer (AMI) assisted mode-locked fiber laser. It is available for the bit-rates range from 2.5 to 7.5 Gb/s.
A novel photonic frequency down-conversion scheme is proposed and demonstrated through directly modulating a dual-wavelength single-longitudinal-mode fiber laser. A 10.6 GHz microwave is down-converted to 1 GHz and a >7 dB signal-to-noise ratio is obtained.
A multi-wavelength erbium-doped fiber laser with a simple line-structure is achieved by employing a Sagnac interferometer. It is demonstrated to be quite stable at room temperature due to the four-wave mixing effect in the dispersion-shifted fiber inserted in the laser cavity.
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