8

Transmitter Optical Characteristics

The following characteristics are defined over the Recommended Operating Conditions unless otherwise noted. Typical

values are for Tc = 40°C, Vcc = 3.3 V

Parameter

(From Table 86-6 of IEEE 802.3ba)

Test Point*

Min

Typ

Max

Units Notes/Conditions

Center wavelength

TP2

840

850

860

nm

RMS spectral width

TP2

0.65

nm

RMS Spectral Width is the stan-

dard deviation of the spectrum

Average launch power, each lane

TP2

-7.6

2.4

dBm

Optical Modulation Amplitude

(OMA) each lane

TP2

-5.6

3

dBm

Even if the TDP<0.9 dB, the OMA

minimum must exceed -5.6 dBm

Difference in launch power

between any two lanes (OMA)

TP2

4

dB

Peak power, each lane

TP2

4

dBm

Launch power in OMA minus TDP,

each lane

TP2

-6.5

dBm

Transmitter and dispersion

penalty (TDP), each lane

TP2

3.5

dB

Extinction ratio

TP2

3

dB

Optical return loss tolerance

TP2

12

dB

Encircled flux

TP2

≥ 86% at 19 μm,

≤ 30% at 4.5 μm

If measured into type A1a.2

50

μm fiber in accordance

with EN 61280-1-4

Eye Mask coordinates:

X1, X2, X3, Y1, Y2, Y3

TP2

SPECIFICATION VALUES

0.23, 0.34, 0.43, 0.27, 0.35, 0.4

UI

Average launch power of OFF

transmitter, each lane

TP2

-30

dBm

* See Figure 6 for Test Point definitions.

1-Y2

Y2

0.5

1-Y1

Y1

1+Y3

-Y3

Normalized Time [UI]

0

X1

X2

1-X2

1-X1

1.0

X3 1-X3

1

0

X1 = 0.23

X2 = 0.34

X3 = 0.43

Y1 = 0.27

Y2 = 0.35

Y3 = 0.40