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IBM42P21SNYAA10
IBM42P21LNYAA10
2x / 1x Fibre Channel Small Form Factor Hot-Pluggable Transceiver
Page 16 of 31
08/15/00
Transmitter Specifications
Symbol
Parameter
Min
Typical
Max
Units
Notes
λ
C
Spectral Center Wavelength
1290
1335
nm
λ
Spectral Width
2.5
nm (rms)
PT
Launched Optical Power
-9.2
-3.0
dBm (avg)
1
T
rise
/T
fall
Optical Rise/Fall Time
150
ps
2
OMA
Optical Modulation Amplitude
189
μ
W
3
RIN
12
Relative Intensity Noise
-117
dB/Hz
4
Eye Opening (2.125Gb/s)
0.56
UI
5
DJ
Deterministic Jitter (2.125Gb/s)
0.26
UI
6
1. Launched optical power is measured at the end of a two meter section of a 9/125
μ
m fiber for the SFF-PGG-2125-LW. The maxi-
mum and minimum of the allowed range of average transmitter power coupled into the fiber are worst case values to account for
manufacturing variances, drift due to temperature variations, and aging effects. The minimum launched optical power specified
assumes an infinite extinction ratio at the minimum specified OMA.
2. Optical transition time is the time interval required for the rising or falling edge of an optical pulse to transition between the 20% and
80% amplitudes relative to the logical 1 and 0 levels. This is measured through a 4th order Bessel -Thompson filter with 0.75 * Data
Rate 3-dB bandwidth and corrected to the full bandwidth value.
3. Optical Modulation Amplitude (OMA) is defined as the difference in optical power between a logic level one and a logic level zero.
The Optical Modulation Amplitude is defined in terms of average optical power (P
AVG
in
μ
W) and extinction ratio (ER) as given by
OMA=2P
AVG
((ER-1)/(ER+1)). In this expression, the extinction ratio, the ratio of the average optical power (in
μ
W) in a logic level
one to the average optical power in a logic level zero measured under fully modulated conditions in the presence of worst case
reflections, must be the absolute (unitless linear) ratio and not expressed in dB. The specified Optical Modulation Amplitude is
equivalent to an average power of -9dBm at an extinction ratio of 9dB.
4. RIN
12
is the laser noise, integrated over a specified bandwidth, measured relative to average optical power with 12 dB return loss.
See ANSI Fibre Channel Specification Annex A.5.
5. Eye opening is the portion of the bit time where the bit error rate (BER) is < 10
-12
. 1.0625Gb/s values meet the criteria listed in Ref
[1].
6. Deterministic Jitter is measured as the peak-to-peak timing variation of the 50% optical signal crossings when transmitting repeti-
tive K28.5 characters. It is defined in FC-PC, version 4.3, clause 3.1.87 as: Timing distortions caused by normal circuit effects in
the transmission system. Deterministic jitter is often subdivided into duty cycle distortion (DCD) caused by propagation differences
between the two transitions of a signal and data dependent jitter (DDJ) caused by the interaction of the limited bandwidth of the
transmission system components and the symbol sequence. 1.0625Gb/s values meet the criteria listed in Ref [1].