A device which converts electrical energy in the form of a current into optical energy is called as

Related MCQs

• 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.
• A planar LED is fabricated from GaAs is having a optical power emitted is 0.018% of optical power generated internally which is 0.018% of optical power generated internally which is 0.6 P. Determine external power efficiency.
• In optical fiber communication, the electrical signal dropping to half its constant value due to modulated portion of optical signal corresponds to _______
• 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
• The optical power at 20 MHz is 246.2 μW. Determine dc drive current applied to device with carrier recombination lifetime for LED of 6ns.
•  For many applications which involve optical fiber transmission, an intensity modulation optical source is not required. State whether the given statement is true or false.
• Which feature of an optical isolator makes it attractive to use with optical amplifier?
• If a particular optical power is coupled from an incoherent LED into a low-NA fiber, the device must exhibit very high radiance . State whether the given statement is true or false.
• 3dB optical bandwidth is always ___________ the 3dB electrical bandwidth.
• The optical bandwidth is _____________ the electrical bandwidth.