Generation of highly stable 20 GHz transform-limited optical pulses from actively mode-locked Er ³⁺ -doped fibre lasers with an all-polarisation maintaining ring cavity

A Polarization-Maintaining and Dispersion-Managed 10-GHz Mode-Locked Erbium Fiber Ring Laser Providing Both sech2- and Gaussian-Shaped Pulses

“…By forcing the lasing wavelength to a narrow-band ripple in the transfer function of the laser in-line filter, highly stable 15-ps Gaussian-like pulses were also obtained. We have studied in detail the temporal and spectral shapes of the ML-EFRL pulses and confirmed a good agreement with the corresponding theoretical TL sech 2 and Gaussian fits, respectively. The pulses have a timing jitter below 0.2 ps and a supermode noise suppression of about 90 dB.…”

“…We carry out a detailed study of the ML-EFRL pulse quality and also investigate the pulse width and wavelength tunability of the laser. We produce both sech 2 and Gaussian-shaped pulses using the same ML-EFRL configuration. Figure 1 illustrates the ML-EFRL setup.…”

Stabilization of mode-locked erbium-doped fiber laser

“…Takara et al [1] and Nakazawa et al [2] constructed fiber lasers with a all-polarization-maintaining ring cavity. Shan et al [3j developed a pulse phase locked method to compensate for the drift ofthe long fiber cavity length.…”

<title>Delay-time tunable mode-locked erbium-doped fiber ring laser</title>

“…Such sources have particularly met the requirements for applications in optical high-data-rate analog to digital conversion. [1] On the other hand, active harmonically mode-locking has been considered as one of the promising techniques to construct the ultrafast lasers with high-repetitive optical pulse-train [2][3][4] and ultrashort pulsewidth. Based on this technique, the mode-locked erbium-doped fiber (ML-EDF) ring laser which provides stable, nearly transform-limited, picosecond optical pulses with low timing jitter [3] has been developed and found its application in ultrahigh bit-rate optical communication, high-speed optical time division multiplexed (OTDM) transmission [5], and electro-optical sampling [6] systems.…”