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Technical Specifications
10-38 Issue 3 June 2001
Table 10-13. 26G2-U/27G-U/27G2-U OLIU Link Budgets (Note)
Parameter Value
Minimum Wavelength (λ
Tmin
) 1272 nm
Maximum Wavelength (λ
Tmax
) 1350 nm
Spectral Width (δλ
rms
)3.0nm
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
)†1.0dB
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
Note: 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 26G2-U/27G-U/27G2-U 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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