How to Perform VCSEL LIV Testing

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Modular Source Measure Unit
+ Modular Source Measure Unit
Modular Source Measure Unit
+ Modular Source Measure Unit

Perform VCSEL LIV Measurement Testing

Light-current-voltage (LIV) testing is often used as a characterization method for vertical-cavity surface-emitting lasers (VCSELs) because it captures how optical output power and forward voltage change as drive current is swept. An LIV test setup must support narrow pulsed current sourcing, simultaneous voltage measurement, and photodiode current acquisition to capture the interaction between emitted light and electrical behavior.

The measurement technique involves generating short current pulses to minimize self-heating effects, capturing transient responses with high-speed sampling, and synchronizing multiple channels to align laser diode and photodiode measurements. Accurate results depend on proper timing control, low-inductance cabling, and high-bandwidth measurement paths to observe dynamic behavior during pulsed operation.

VCSEL LIV Test Measurement Solution

LIV testing requires generating narrow current pulses while synchronizing multiple measurement channels to capture electrical and optical responses accurately. The solution integrates a high-channel-density source measure unit (SMU) platform capable of pulsed current sourcing and high-speed digitizing. It supports synchronized multi-channel measurements with sub-50 ns timing accuracy, enabling precise alignment between laser diode drive and photodiode response. The system also incorporates low-inductance cabling and remote voltage measurement to reduce errors caused by cable effects. With high sampling rates and compact multi-channel integration, the solution enables accurate dynamic characterization and scalable parallel testing.
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