NOT TEMPERATURE STABILIZED PULSED LASER DIODE AND ALL FIBRE POWER AMPLIFIER

摘要

A laser system has an output/input coupler unit (49) with a circulator (37). An output of the circulator (37) is operationally connected to a detector un it (43). The input/output (EA37) of the circulator is operationally connected t o a transmitter and a receiver optics 41. Laser light is input to the circulat or (E37). The input (E37), output (A37) and output/input (E A37)of the circulat or are optical fibres. The pulsed diode (3) is not temperature stabilized. To reduce ASE generated in the optical fibre amplifier (9), a narrow band-pass filter unit (29) is used. Filter unit (29) has a central wavelength with a temperature dependence which is matched to the temperature dependent wavelength shift of the pulsed diode (3).