Question

2) Semiconductor lasers can be direct
1 poin
modulated to high frequency (up to 25 GHz)
because of,
a long life time associated with the
stimulated emission
a short life time associated with stimulated
emission
a long lifetime associated with the
spontaneous emission
the small structure of the laser​

Answer 1

Answer:

b

Explanation:

Answer 2

Answer: 2nd option: short life time associated with stimulated emission.

Explanation:

1. predominantly semiconductor laser devices were made from chips of gallium arsenide. These devices had very high threshold currents and could only be operated at low tempratures.
2. Semiconductor lasers have been developed keeping in mind to be the key component in home systems such as disks, video players, that's they are meant to have short life span when modulated at high frequencies.
3. Though the technique used for developing semiconductor lasers are identical to the technique used for developing electronic devices but a lot of difference in the span and their frequencies at which they work comfortable.
4. The ability to modulate its output by direct modulation of the pumping current . Hence it does work better at high frequency of upto 25 Ghz.

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