Ch6Sec6 - THE FIBER FORUM Fiber Optic Communications JOSEPH...

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Unformatted text preview: THE FIBER FORUM Fiber Optic Communications JOSEPH C. PALAIS PRESENTED BY Joseph C. Palais 6.6 2 Section 6.6 Narrow-Spectral-Width and Tunable Laser Diodes In this section we discuss the distributed feedback laser diode (DFB), which produces a narrow linewidth and the tunable laser diode, which produces system flexibility. Joseph C. Palais 6.6 3 p n 6.6.1 Distributed Feedback Laser Diode The DFB was developed to obtain a single- longitudinal-mode laser diode . Different Materials Grating The grating acts as a filter, permitting only one of the cavitys modes to propagate. Cleaved Facet Active Layer Metallization Joseph C. Palais 6.6 4 Laser Gain Cavity Resonances Grating Resonances Laser Output DISTRIBUTED-FEEDBACK LD Joseph C. Palais 6.6 5 The grating resonances, according to Braggs law, are those wavelengths for which the grating period (illustrated on a preceding slide) is an integral number of half-wavelengths. That is: n = (6.10) is the wavelength in the diode, m is an integer DISTRIBUTED-FEEDBACK LD 2 m = is the free-space wavelength Joseph C. PalaisJoseph C....
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This note was uploaded on 05/11/2010 for the course EEE EEE-448 taught by Professor Palais during the Fall '09 term at ASU.

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Ch6Sec6 - THE FIBER FORUM Fiber Optic Communications JOSEPH...

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