363-206-305
Technical Specifications
Issue 3 June 2000
10-25
Table 10-10 and Table 10-11 list the link budgets for the 26-type OLIU circuit
packs.
Table 10-10. 26-Type OLIU Link Budgets
Notes:
Parameter
26-Type
Minimum Wavelength (
λ
Tmin
) 1272 nm
Maximum Wavelength (
λ
Tmax
) 1350 nm
Spectral Width (
δ
λ
rms
)
3.0 nm
Maximum Transmitter Power (P
Tmax
)
∗
−
0.0 dBm
Minimum Transmitter Power (P
Tmin
)
∗
−
7.0 dBm
Maximum Received Power (P
Rmax
)
−
13.8 dBm
Minimum Input Power (P
Rmin
)
−
30.8 dBm
Minimum System Gain (S-R)‡ 23.8 dB
Optical Path Penalty (P
O
) † 1.0 dB
Connector Loss ‡ 1.5 dB
Unallocated Margin 1.5 dB
Minimum Loss Budget 13.8 dB
Maximum Loss Budget 19.8 dB
Maximum Span Length§ 44 km
1.
All values are for both controlled and uncontrolled
environmental conditions.
∗
Transmit and receive powers are referenced to points S and R
as shown in Figure 10-2.
†
Optical path penalty includes effects of dispersion, reflection
and jitter that occur on the optical path.
‡
One connector (0.75 dB) on each end is assumed to connect
station cable to outside plant.
§
The 26-type OLIUs are dispersion limited at 44 km, due to the
wider wavelength range. Assuming fiber with zero dispersion
wavelength between 1300 and 1320 nm, the worst case
dispersion over the transmitter wavelength range of 1272 to
1350 nm is 4.88 psec/nm km. This implies a 44 km span would
have a total dispersion of about 215 psec/nm.
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