| 单词 | DFB laser (Distributed FeedBack laser) |
| 释义 | DFB laser (Distributed FeedBack laser) A diode laser that operates at high output power levels over very short cycle times, and emits a signal at long wavelengths with very narrow spectral width.A DFB uses diffraction gratings, which act as distributed reflectors, to create the photonic resonance and oscillation in the cavity.This approach improves on the mirrors used in Fabry-Perot and vertical cavity surface-emitting laser (VCSEL) cavities. The high output power level means that the signal can suffer attenuation over longer distances and survive.The short cycle time translates into a very high bit rate.The diffusion grating supports signal emissions at spectral widths under 1 nm, which effectively means that a DFB laser emits a single wavelength. This narrow spectral width is significant in the context of wavelength division 74570c04.qxd 9/11/07 12:19 PM Page 132 |
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