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The "mode" means a wavelength generated by a laser cavity. Mode hopping is the phenomenon of a dominant mode's shift in random pattern, while mode competition is the continual intensity fluctuations among several modes with the total intensity remaining constant.
The "triple play" terminology seems to have multiple usage and differs slightly. In general, a service provider (SP) may not care about any special technology; as long as the SP can provide "video+voice+data" services in any way, the SP can call it triple-play service . But, a software engineering viewpoint uses this terminology as the integration of services using the Internet protocol (IP). For clarity, we emphasize wavelength-overlaid "triple-play" PON service.
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GR-1209-CORE for passive fiber optic components.
GR-1221-CORE for passive fiber optic component reliability.
There are several reasons for using the CWDM filter. For the same reasons, this CWDM filter may be used at an EPON ONU, as follows: (i) This CWDM filter prevents the downstream signal from entering the LD at the ONU; (ii) the insertion loss of the filter is far less (~0.5 dB) compared to a 2×1 splitter (~3.5 dB); (iii)This filter prevents the potential upstream signal from entering the PD at the ONU.