Q. Determine degradation rate βrif constant junction temperature is 17 degree celsius.

View solution

Q. The 3 dB electrical bandwidth B is 42 MHz. Determine 3 dB optical bandwidth Bopt.

View solution

Q. Determine the 3 dB electrical bandwidth at 3 dB optical bandwidth Bopt of 56.2 MHz.

View solution

Q. The optical power at 20 MHz is 246.2 μW. Determine dc drive current applied to device with carrier recombination lifetime for LED of 6 ns.

View solution

Q. When a constant d.c. drive current is applied to device, the optical o/p power is 320 μm. Determine optical o/p power when device is modulated at frequency 30 MHz with minority carrier recombination lifetime of LED i.e. 5ns.

View solution

Q. The optical bandwidth is _____________ the electrical bandwidth.

View solution

Q. The optical 3 dB point occurs when currents ratio is equal to _____________

View solution

Q. In optical fiber communication, the electrical signal dropping to half its constant value due to modulated portion of optical signal corresponds to _______

View solution

Q. The active layer composition must be adjusted if a particular center wavelength is desired.

View solution

Q. For particular materials with smaller bandgap energies operating in _____________ wavelength, the linewidth tends to ______________

View solution

Q. To utilize _____________________ of SLDs at elevated temperatures, the use of thermoelectric coolers is important.

View solution

Q. The internal quantum efficiency of LEDs decreasing _______________ with ________________ temperature.

View solution

Q. Linearizing circuit techniques are used for LEDs.

View solution

Q. Intrinsically _________________ are a very linear device.

View solution

Q. The active layer of E-LED is heavily doped with ____________

View solution

Q. The InGaAsP is emitting LEDs are realized in terms of restricted are ____________

View solution

Q. Mesa structured SLEDs are used ____________

View solution

Q. The overall power conversion efficiency of electrical lens coupled LED is 0.8% and power applied 0.0375 V. Determine optical power launched into fiber.

View solution

Q. Determine the overall power conversion efficiency of lens coupled SLED having forward current of 20 mA and forward voltage of 2 V with 170 μW of optical power launched into multimode step index fiber.

View solution

Q. In a multimode fiber, much of light coupled in the fiber from an LED is ____________

View solution