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.