IBM Nways 8260, Installation Manual

Page: 42 / 50

SC Multimode Transmitters
Notes:
1. These optical power values are measured with the following conditions:
Ÿ
At the Beginning Of Life (BOL).
Ÿ
Over the specified operating voltage and temperature ranges.
Ÿ
With HALT Line State (12.5 MHz square-wave) input signal.
Ÿ
At the end of one meter of noted optical fiber with cladding modes removed.
The average power value can be converted to a peak power value by adding 3 dB.
2. This transmitter is available on special request with coupled optical power
guaranteed into 50/125 micron fiber cables. The value will depend on the specific
NA of the 50/125 micron fiber used.
3. This parameter complies with the FDDI PMD requirements for the tradeoffs
between center wavelength, spectral width, and rise/fall times. The temperature
coefficient of the center wavelength is typically
+
0.37 nm/°C.
Table 23. Optical Specifications for SC Transmitters: Multimode Fiber
Parameter Minimum
Value Typical
Value Maximum
Value Unit
Optical Power Output (P
O
):
50/125 micron cable
1,2
NA 0.20 fiber
−
22.5
−
18
−
14 dBm avg
62.5/125 micron cable
ñ
NA 0.275 fiber
−
19
−
16
−
14 dBm avg
Center Wavelength
ó
(
λ
c
) 1270 1300 1380 nm
Modulation Frequency — 155.52 — MHz
32
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