Figure 9

(a) Schematic of laser cavity used in the experiment. LD: Laser diode; WDM: Wavelength division multiplexer; EDF: Erbium doped fibre; ISO: Isolator, OC: Optical coupler and PC: Polarization controller. (b) Transmission of the tuneable filter. These were exchangeable and removable filters. The FWHM of these filters were 4.97 and 1.14 nm.