Abstract
In the design of new components for passive optical networks (PONs), the non-ideal properties are worth considering. In this paper the influence of interface roughness and temperature changes on final transmittance of downstream channels blocking filters for next generation dense wavelength division multiplexing passive optical networks(DWDM-PONs) is shown. The transmittance as the filter transfer characteristicswas calculated with the transfer matrix method. The roughness was expressed by root mean square deviations from an ideally smooth surface and was taken into account in the modified Fresnel coefficients. It is demonstrated how the interfacial roughness may increase the insertion loss and decrease the channel bandwidth which results in reduction of transmitted light energy through the filter.
Highlights
Considerable interest is given to future developments of passive optical networks (PONs) satisfying the demands for increasing traffic, higher bandwidth and extended reach [1], [2], [3]
It is expected that the current gigabit-capable (GPON) and 10 Gb·s−1 PON (XG-PON), the so-called generation PON networks stage 1 (NG-PON1) will be followed by the NG-PON stage 2
Since the TWDM-PON will be extended after several years of use it is necessary to study new possible options for improvement of these types of PON networks [7]
Summary
Considerable interest is given to future developments of passive optical networks (PONs) satisfying the demands for increasing traffic, higher bandwidth and extended reach [1], [2], [3]. The polarization independence of the filter is important for our proposal of using the same filter in various ONUs in DWDM-PON where the filter is tuned by the angle of light incidence for the specific wavelength in a particular ONU. In DWDM-PON each ONU can be equipped with the same filter but in each of them at a different angle of incidence This could be a strong advantage and cost-saving solution due to the fact that in ONUs for all subscribers only TFFs secure the selection of the right channel. This type of blocking filters can provide the coexistence with older PON technologies without replacing ONUs with new models. Teristics of TFF filter may be negatively affected, what is the consequence of various undesirable effects
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