Fp Laser Vs Dfb Laser

The fp laser spectral width is relatively wide is a multi longitudinal mode lasers.

Fp laser vs dfb laser.

In summary fp and dfb lasers working principles are different. It has output power capability much lower than fp laser type. Their operating wavelength threshold current and forward voltage are also different. 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. Dfb laser is with higher production cost and suitble for long distance transmission. Optical fiber transmissions of using direct modulation and external modulation for multi receiver array have been applied to remove the cable cross. In this tutorial we will quickly explain what is a dfb.

Shen 1electrical and electronic engineering the university of hong kong hong kong china people s republic of introduction. The main difference can be got by the form between the fp and dfb laser is that the spectral width is different. With increasing current the wavelength of the laser red shifts as the device heats up. This leads to narrower linewidths than are produced by fp lasers.

Fp lase are mainly used for low rate short distance tramission. A distributed feedback laser dfb is a type of laser diode quantum cascade laser or optical fiber laser where the active region of the device contains a periodically structured element or diffraction grating the structure builds a one dimensional interference grating bragg scattering and the grating provides optical feedback for the laser this longitudinal diffraction grating has periodic. Yuan and g. Comparison of fp vcsel and dfb laser diode in optical transmission for mr rf coil array c.

Fabry perot laser diodes are lasers whose mirrors are simply the flat cleaved surfaces at the ends of the laser chip. 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. Typical tuning curve of a dfb laser 3. This is colin from fiber optics for sale.

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. 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.

This is a fatal mode hop if the desired wavelength exists within the gap.