October 2007
Intermediate to advanced
368 pages
10h 55m
English
Content preview from Passive Optical Networks
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2.10.1 Advantages and Challenges of WDM-PON
WDM-PON offers the following advantages:
1. The optical distribution plant is still passive and therefore has the same low-
maintenance and high-reliability properties of PS-PON.
2. Each user receives its own wavelength. Therefore WDM-PON offers excellent
privacy.
3. P2P connections between OLT and ONUs are realized in wavelength domain.
There is no P2MP media access control required. This greatly simplifies the MAC
layer. There will not be distance limitation imposed by ranging and DBA protocols.
4. Easy pay-as-you-grow upgrade. In a PS-PON, if the OLT speed is increased,
all ONUs need to be upgraded at the same time. Such a problem does not exist
with WDM-PONs. Each wavelength in a WDM-PON can run at a
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