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State the difference between LED and LASER.

written 8.5 years ago by teamques10 ★ 68k

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Mumbai University > Electronics Engineering > Sem7 > Optical Fiber Communication

Marks: 5M

Year: May2014, May2012

optical fiber communication

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written 8.5 years ago by teamques10 ★ 68k

Sr. No.	LED	LASER
1.	LED- Light emitting diode	LASER- Light amplification by stimulated emission of radiation
2.	LED’s are small in size, longer life, reliable & require little power.	Laser’s are bigger in size, longer life, less reliable & require more power than LED.
3.	Laser’s are bigger in size, longer life, less reliable & require more power than LED.	Generating photon by stimulated emission.
4.	LED’s produce a divergent & incoherent light beam.	Laser produces a monochromatic & coherent light beam.
5.	Types of LED (a) surface emitter (b) Edge emitter	Types of LASER (a) semiconductor Laser (b) Gas Laser
6.	Their response is fast.	Their response is faster than LED.
7.	Bandwidth of LED is moderate	Bandwidth of Laser is higher
8.	Here require drive current is 50 to 100mA	Here require drive current is Threshold current of 5-40mA.
9.	Feedback is not required in LED.	Proper feedback is essential in LASER to be treated as an optical source.

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