Abstract
A simple dual-wavelength C-band laser source with the aid of Fibre Bragg gratings (FBG) with an optical signal to noise ratio (SNR) of 70dB is discussed. The laser includes a 3,2m Erbium doped fibre with 11,38dB/m absorption in a ring resonating cavity with optical couplers. The ring cavity has two FBGs centred at 1555.12nm and 1560.32nm attached to a 3dB coupler. A 1m long Sagnac loop with 70:30 coupling was used to stabilise the dual emitted wavelengths. The multi-wavelength and narrow spectral width of 0.183nm and 0.195nm of the laser can be used for dispersion measurement in wavelength division multiplexed (WDM) communication links which consist of more than one wavelength. The laser was characterised for dual output power response and power stability. The paper presents a characterisation of an Erbium doped fibre (EDF) ring laser. The laser is cost effective and flexible in selecting preferred components for optimal performance in terms of power and wavelength stability, wavelength selectivity and narrow spectral width. EDF lasers are commercially available and are already showing great promise in terms of their formidability and compatibility with current industrial requirements.