Fp Laser Vs Dfb Laser

Fabry perot laser diodes are lasers whose mirrors are simply the flat cleaved surfaces at the ends of the laser chip.

Fp laser vs dfb laser.

Fp lase are mainly used for low rate short distance tramission. It has output power capability much lower than fp laser type. This is a fatal mode hop if the desired wavelength exists within the gap. Their operating wavelength threshold current and forward voltage are also different.

In this tutorial we will quickly explain what is a dfb. Dfb laser is with higher production cost and suitble for long distance transmission. The spectral width of the dfb laser is generally narrow is a single longitudinal mode with distributed negative feedback. Comparison of fp vcsel and dfb laser diode in optical transmission for mr rf coil array c.

The fp laser fp fabry perot laser is a semiconductor light emitting device that emits multi longitudinal mode coherent light with a fp cavity as a resonant cavity. The main difference can be got by the form between the fp and dfb laser is that the spectral width is different. In summary fp and dfb lasers working principles are different. Shen 1electrical and electronic engineering the university of hong kong hong kong china people s republic of introduction.

Chart from reference 3. For example the tramission distance is generally within 20 km the speed is generally within 1 25 g and the fp is divided into two wavelengths 1310 nm 1550 nm. Eventually a red shift occurs to a higher gain mode leaving a gap in the tuning range. It is more precise compare to fp laser type.

Distributed feedback dfb laser diodes are lasers that have a grating structure in the cavity that produces multiple reflections throughout the cavity. This is colin from fiber optics for sale. This leads to narrower linewidths than are produced by fp lasers. Distributed feedback laser selects only one principal wavelength in fp laser spectrum.

Optical fiber transmissions of using direct modulation and external modulation for multi receiver array have been applied to remove the cable cross. Typical tuning curve of a dfb laser 3. Following are the characteristics of this dfb laser type. While the spectral width of the fp laser is relatively wide it is a multi longitudinal mode laser.

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