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Online calculators for selecting and debugging lasers, SLDs and photodetectors — transparent formulas, instant results, with the device physics behind each tool.

Serial Lookup · Factory Report & TraceabilitySERIAL LOOKUP Retrieve the measured factory report and full production trace for any unit, by serial number + verification code. Open →
01 — GENERAL CONVERSIONS
λ
Wavelength · Frequency · Energy
λ, THz, cm⁻¹ and eV in one place
 Δλ
Spectral Width Δλ ↔ Δν
nm / pm ↔ THz / GHz / MHz
 dBm
dBm ↔ mW
Optical power, log ↔ linear + table
 dB
dB ↔ Linear Ratio
Read SMSR & PER specs as ratios
02 — SLD · COHERENCE & OCT
Lc
Coherence Length
Gaussian (SLD) & Lorentzian (DFB) models
 δz
OCT Axial Resolution
Source bandwidth sets depth resolution
 ∿
Spectral Ripple & FSR
Ripple period ↔ cavity length, AR → depth
03 — DFB · TDLAS
∂λ
DFB Thermal / Current Tuning
Target wavelength → TEC & current
 with recommendations CH₄
Gas Absorption Line Finder
12 gases below 2.9 µm + matched models
 L-I
LIV Parameters
Two-point threshold & slope efficiency
04 — PD · FIBER · PACKAGING
A/W
PD Responsivity
QE ↔ R (A/W), power → photocurrent
 ◎
Fiber Coupling Loss
Mode-field mismatch, NA / MFD
 ⊷
Collimation & C-LENS Selection
Divergence → spot, distance → R
 PM
PM Polarization Beat
Identify OSA polarization-beat artifacts
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