M. Sharma et al., WDM RING NETWORK USING A CENTRALIZED MULTIWAVELENGTH LIGHT-SOURCE ANDADD-DROP MULTIPLEXING FILTERS, Journal of lightwave technology, 15(6), 1997, pp. 917-929
We propose and experimentally demonstrate a wavelength division multip
lexed (WDM) ring network employing a centralized multiwavelength light
source to supply all nodes with optical carriers of precise wavelengt
h spacing, This approach overcomes the problem of monitoring and contr
olling the wavelengths of optical sources dispersed throughout;the net
work, A four-node test bed using optical lattice-type add-drop multipl
exing filters and a multiwavelength light source based on resonant cav
ity-enhanced four wave mixing in a Fabry-Perot laser diode was constru
cted to demonstrate the feasibility of the proposed method, The effect
s of coherent crosstalk in such networks are analyzed, and methods suc
h as phase scrambling or the use of a pulsed optical source are shown
to significantly reduce the effects of coherent crosstalk, The use of
four-port add-drop multiplexer (ADM) filters instead of 1:n optical wa
velength multiplexer/demultiplexers to implement the wavelength add-dr
op function at each node is shown to lead to a broader transmission ba
ndwidth for each channel and also easier compatibility with the cohere
nt crosstalk suppression mechanisms described.