HFE4093-342 Datasheet, PDF (4/6 Pages) Finisar Corporation. – 2.5Gbps, 850nm VCSEL, TO-46 Package

HFE4093-342
Product Specification – Aug 2014
Finisar
1. Reliability is a function of temperature, see www.finisar.com for details.
2. For the purpose of these tests, I_F is DC current.
3. Threshold current varies as (T_A – T_O)². It may either increase or decrease with temperature,
depending upon relationship of T_A to T_O. The magnitude of the change is proportional to the
threshold at T_O.
4. Slope efficiency is defined as ∆P_O/∆I_F.
5. To compute the value of Slope Efficiency at a temperature T, use the following equation:
η(T) ≈ η(25^oC)*[1+(∆η/∆ T)*(T-25)]
6. Rollover is the power at which a further current increase does not result in a power increase.
7. Rise and fall times specifications are the 20% - 80%. Most of the devices will measure <135ps fall
time. Rise and fall times are sensitive to drive electronics.
8. To compute the value of Series Resistance at a temperature T, use the following equation:
R_S(T) ≈ R_S(25^oC)*[1+(∆R_S/ ∆T)*(T-25)]
9. Beam divergence is defined as the total included angle between the 1/e² intensity points.
10. These specifications are for the TO-46 component alone. Reflections introduced by any
subsequent higher level assembly may affect these values.
11. Monitor current tracking is defined as follows:
IPD(PO = 0.75mW) / 0.75mW
Deltrk =
IPD(PO = 0.45mW) / 0.45mW
III. Typical Performance Curves
Emitted Power vs. Current: Power varies approximately Threshold Current vs. Temperature: Threshold
linearly with current above threshold.
current varies parabolically with temperature; thus it can
be nearly constant for a limited temperature range.
Pmax
η
Typical operating current / power
Ith
Current
I _{T H} ≈ I _{M IN} [1 . 1 × 1 0 ^-4 (T -T _{M IN} )² + 1 ]
T _{M IN} , I _{M IN}
T e m p e ra tu re
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