L. Dong et al., NOVEL ADD DROP FILTERS FOR WAVELENGTH-DIVISION-MULTIPLEXING OPTICAL-FIBER SYSTEMS USING A BRAGG GRATING-ASSISTED MISMATCHED COUPLER/, IEEE photonics technology letters, 8(12), 1996, pp. 1656-1658
We have demonstrated a novel add/drop filter for use in wavelength-div
ision-multiplexing (WDM) optical fiber systems based on a Bragg gratin
g assisted mismatched coupler. The de,ice is potentially easy to fabri
cate and stable, because it is not interferometric, unlike all similar
devices demonstrated so far, and, therefore, does not need fine tunin
g of the interferometers during fabrication and does not have to maint
ain the balance of the interferometers during its lifetime.