Thus, reliable frequency tuning is achieved, without mode hopping.
This provides frequency tuning in which mode hopping is suppressed.
The problem addressed by the present invention is to provide a variable wavelength laser for which wavelength tuning can be carried out over a wide band without mode hopping.
The methods may additionally comprise adjusting the cavity of the laser when a mode hop is detected (18).
The object of the grating is to produce a sufficient frequency selectivity, so that the optical resonator operates in a stable manner in one longitudinal resonator mode without mode hops.
^ "Fashion leap for Jackie Chan as Kung-fu star promotes new clobber".
↑ "Fashion leap for Jackie Chan as Kung-fu star promotes new clobber".
A method for data processing in an optical network element is provided, wherein an event of a forthcoming mode-hop of a tunable laser is detected.
The average of the pre and post mode hop ratios is utilized as a control setpoint while finely tuning the laser (20) to the target frequency.
The wavelength of the emitted radiation is measured and variations in the applied currents required to cross a mode boundary such that the laser undergoes a mode jump to emit . radiation at a significantly different wavelength are also measured.
A blazed grating, in particular of the microfabricated type, is disclosed as well as mode hop-free tunable lasers in which this grating is employed, and a process for fabricating gratings of this type.
A laser is then pointed at the opposite, reflecting side of the mirror, thereby itself reflecting off the mirror and going back in to the cavity of the laser, creating a mode-hopping effect.
A laser is then pointed at the opposite, reflecting side of the mirror, thereby itself reflecting off the mirror and going back in to the cavity of the laser, creating a mode-hopping effect.
A novel interference filter which may be used to tune the ECL provides an absence of mode-hopping and reduced feedback from both spurious interference (210) and reflections (214) in the external cavity.
A laser is then pointed at the opposite, reflecting side of the mirror, thereby itself reflecting off the mirror and going back in to the cavity of the laser, creating a mode-hopping effect.
The power of each of beam is measured by optical detectors (24,25), and a ratio thereof is utilized to detect when a mode hop occurs as the laser (20) is coarsely tuned.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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