Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Optical pulse duration (s)

Required number input.

Fiber group index

Required number input.

Estimate OTDR two-point spatial resolution from transmitted pulse duration and fiber group index; receiver bandwidth and dead zones can worsen it. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Pulse-limited spatial resolution (m)

The resulting pulse-limited spatial resolution returned as a number.

• OTDR distance and resolution depend on group index, pulse width, sampling, dynamic range, dead zones, wavelength, launch conditions, backscatter, and event thresholds. Trace interpretation and acceptance require the fiber specification and calibrated instrument settings.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• OTDR Distance

  Convert optical time-domain reflectometer round-trip delay to one-way fiber distance using its group refractive index.

• Radar Pulse Compression Ratio

  Ideal matched-filter pulse-compression ratio equal to transmitted pulse duration times swept bandwidth.

• CAN Bus Load Percentage

  Calculate measured CAN bus utilization from total transmitted on-wire bits, link bit rate, and observation duration; bit stuffing must already be counted.