Résumé
The frequency and current dependences of the optical output spectral noise density, Slph, in p-InAsSbP/n-InAs infrared light emitting diodes (LEDs) has been measured for the first time. LEDs with emission centered at wavelengths = 2.8 and 3.5 µm have been studied. In both cases, in the frequency range 2 ≤ f ≤ 100 Hz the noise spectrum is 1/f like. At constant LED pumping current, Slph is proportional to the photocurrent squared (~ Iph2). The 1/f noise intensity Slph for the LED with emission centered at = 2.8 µm is ~2 times higher. In the LED pumping current range 0.02 ILED 0.1 A (60 jLED 300 A/cm2) the optical output 1/f noise is practically independent of ILED. The intensity of the LEDs’ optical output 1/f noise is less than the intensity of the photodiode reverse bias current noise by ~4 orders of magnitude.