Influence of DFB laser light on spectral properties of LDs and LEDs

摘要

The contribution deals with the influence of DFB laser light on spectral properties of coherent and noncoherent sources. DFB laser, FP laser and surface emitting LED have been as the directed light sources. All sources operated at wavelengths around 1550 nm. As a master DFB laser the tunable laser within range of wavelengths from 1510-1610 ran has been applied. The connection of light sources was carried out with the help of fiber optical couplers 2×2 with division ratio 50:50. The spectral properties of directed light sources were searched in dependence on wavelength changes of tunable laser source. Besides of wavelengths, the optical power of tunable laser has been changed in range -0,25 dBm - 0 dBm. All changes within directed light sources were searched for various values of driving currents. It was verified experimentally that the mutual interaction DFB-DFB lasers is minimal, the influence of optical power coming from master DFB laser appeared as neglected. Several effects manifested during mutual interaction between master DFB laser and directed FP laser. In this case the intense changes in optical power of particular modes were observed. Some modes had suppressed their powers some modes were dominantly excited. These changes could be the basis for construction of all optical switches or for devices making logical functions. Important spectral changes were also observed in case of mutual interaction between DFB master laser and directed surface emitting LED.