Lucent Technologies WaveStar OLS 40G, Руководство по установке

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2-16
Issue 1.0 March 2001
365-575-389
Installation Manual
System Installation Planning
Optical Translator Basics (Continued)
Connecting Non-
OLS-Compatible
Optics to WaveStar
OLS 40G
(continued)
■
The receiver on the customer equipment must operate in the 1550nm band
and meet the input power range and signal-to-noise requirements that the
drop OTU would meet as specified in the Technical Specifications in the
Applications, Ordering, and Planning Guide (APOG, 365-575-386). Not all
receivers from all manufacturers will meet these requirements. Customers
must evaluate the various receivers they wish to directly connect to the
OLS 40G.
■
In the case of fiber congestion relief, if the OLS 40G system is inserted into
a direct fiber span that previously carried the customer signal between
transmitter and receiver, then no drop OTU is needed. In other words, if the
customer equipment operated over the existing span, then it should also
operate through the OLS 40G system using the same span.
■
For OLS 40G systems with more than one span, typically the drop OTU is
required because the fiber dispersion or signal-to-noise performance
exceeds the existing receiver capability.
Signal
Regeneration and
Wavelength
Translation Optical Translator Units are used between back-to-back OLS end terminals or in
dual facing shelves to regenerate OC-48, OC-12, or OC-3 signals. The
regenerated signal can output the original wavelength or the output can be
translated to another wavelength. See Figure 2-14.
Figure 2-14. OTUs Used for Signal Regeneration and Wavelength Translation
Wavelength Add-
Drop Optical Translator Units are used to add/drop and regenerate the OC-48, OC-12,
and OC-3 signals between several OLS. The regenerated signals can output the
original wavelength or the output can be translated to another wavelength. See
Figure 2-15.
(Continued on next page)
1A-TX
End Terminal
OTUs For
1A-RCV
End Terminal
Wavelength 3
OTUs For
Wavelength 5
λ
3
λ
3
λ
7
λ
5
To/From
Rest Of
OLS
To/From
Rest Of
OLS