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← ScienceWhich modulation outcome occurs when a laser diode's injection current changes?
A)Chirp broadens emitted spectral bandwidth✓
B)Polarization rotates proportionally slower
C)Coherence length increases significantly
D)Spatial mode converts to higher order
💡 Explanation
Chirp, or frequency modulation, broadens the bandwidth because variations in current density change the refractive index, causing wavelength shifts during the pulse; therefore spectral broadening occurs rather than polarization or spatial mode changes, which depend on different mechanisms.
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