Multiwavelength narrow linewidth erbium-doped fiber laser based on cascading two FP-LDs
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In this paper, we propose and demonstrate a technique to realize multiwavelength operation in an erbium-dopedfiber laser (EDFL) by inserting two Fabry Pérot laser diodes (FP-LDs) in the laser cavity in cascaded way. The FP-LDs not only act as wavelength selection elements, but also offer optical gain or loss for the operation wavelengths in the laser cavity. The gains or losses for the oscillation wavelengths obtained from FP-LDs differ with adjustment of the driving current of the FP-LDs. Thus, the utilization of the FP-LDs in the laser cavity can introduce wavelength dependent gain or loss which can effectively suppress the competition caused by the homogeneous gain broadening of the erbium-doped fiber (EDF). As a result, 16-wavelength operation with a wavelength-spacing of 1.25 nm has been achieved. The measured power fluctuation of each wavelength is smaller than 0.4dB. Furthermore, the injection locking of the FP-LDs ensures a narrow linewidth of the EDFL output and the linewidth is estimated to be narrower than 100 MHz.Keywords:
Laser linewidth
Erbium
Laser diode
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In this paper, principles of linewidth reduction of external cavity semiconductor lasers are analyzed. Linewidth measurement is performed by the Delayed Self Heterodyne Method. It is obtained experimentally that laser linewidth is reversely proportional to laser output power and external cavity feedback level.
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To calculate the linewidth for an index-guided semiconductor laser, one usually neglects a correction factor for the spontaneous emission rate, which is introduced by the longitudinal field distribution within the laser cavity. For FabryPerot lasers with cleaved facets the correction factor is small. However, for DFB lasers this correction factor may become quite significant, yielding a linewidth enhancement for DFB laser diodes.
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Summary form only given. An injected (slave) laser can become slaved onto another one (master) and frequency locking occurs following the injected intensity and the frequency difference between both lasers. Optical injection can give a frequency reference or transfer to a slave the spectral properties (linewidth) from a master. For lasers tuned on the same central frequency, decreasing the injected power implies a partial linewidth transfer, when the master linewidth is larger than the slave linewidth. In the converse case (master linewidth smaller than slave linewidth), the laser amplifies at the sample rate both the spontaneous emission from the slave and the external injected field. We have in this way characterized optical spectra of signals in the picowatt range. In our experiment, two single mode lasers are used: a tunable source with a linewidth of 80 kHz for the master and a DFB laser for the slave with a linewidth much wider (2-200 MHz) depending on the bias current. Adding to the laser detector a heterodyne technique, signals in the femtowatt range were detected. The aim is to study the amplification of the laser detector.
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Laser systems with simultaneously narrow linewidth and high power are crucial in many research areas and applications. We present a novel laser system based on a regular multi-frequency laser diode and high-Q optical whispering gallery mode (WGM) microresonator. The self-injection locking effect is used to narrow the linewidth of the laser diode emission down to 2 kHz without significant reduction in the output optical power. The compact prototype device based on the proposed optical scheme is manufactured.
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Laser diode
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