HFE4093-332 Product Specification – Oct 2014
F i n i s a r
Confidential and Proprietary © 2014 Finisar Corporation. All rights reserved Rev. B00 Page 4
III. Typical Performance Curves
Emitted Power vs. Current: Power varies approximately
linearly with current above threshold.
Threshold Current vs. Temperature: Threshold
current varies parabolically with temperature; thus it can
be nearly constant for a limited temperature range.
T e m p e ra tu re
Threshold Current
T
M IN
, I
M IN
I
T H
≈
≈ ≈
≈
I
M IN
[1 . 1 × 1 0
- 4
(T -T
M I N
)
2
+ 1 ]
Typical characteristics of single mode VCSELs
They are even more sensitive to ESD than are multi-mode VCSELs or CD lasers.
They operate at currents
typically below 5 mA and should never be driven at much higher currents.
The spectral peak shifts
significantly with current, but shifts only slowly with ambient temperature. Operation at a particular
wavelength can be achieved by first setting the current at an appropriate level, then adjusting the
temperature. While they are designed to stay single mode over the whole operating current range, at very
high currents they may become multi-mode, increasing the spectral width and the beam divergence.
Pmax
Typical operating current / power
I
th
η
