Semiconductor laser transmitter with a frequency-selective directional fibre coupler as an external resonator

摘要

Narrow-band laser transmitter (LS) with semiconductor laser (HL), external optical resonator (ER) in the form of a wavelength-selective fiber directional coupler (RK) and partially transparent feedback device (RKE), the output power (ASt) of the transmitter (LS) being removable from the resonator (ER) . A transmitter (LS) of this type has already been proposed and works with a loop-shaped optical waveguide. Such a narrow-band transmitter is specified, which is of compact design and does not require a loop-shaped waveguide. For this purpose, the frequency-selective fiber directional coupler (RK) consists of a dispersive double-core fiber and the feedback device (RKE) is supplied with a radiation power coupled from one core to the other core, the part of which transmitted through the feedback device (RKE) contains the output power (ASt) of the transmitter (LS). forms.