Question

In: Electrical Engineering

Describe briefly how the laser is modulated? Using the simple rate equation for carrier and photon...

Describe briefly how the laser is modulated? Using the simple rate equation for carrier and photon density, explain why the high-speed small-signal response will behavior like L-C circuit? Why the bandwidth (resonant frequency) increases as the current increases?

Solutions

Expert Solution

An optical modulator is a device which is used to modulate a beam of light. The beam may be carried over free space, or propagated through an optical waveguide (optical fibre). Depending on the parameter of a light beam which is manipulated, modulators may be categorized into amplitude modulators, phase modulators, polarization modulators etc. Often the easiest way to obtain modulation of intensity of a light beam, is to modulate the current driving the light source, e.g. a laser diode. This sort of modulation is called direct modulation, as opposed to the external modulation performed by a light modulator. For this reason light modulators are, e.g. infiber optic communications, called external light modulators.

With laser diodes where narrow linewidth is required, direct modulation is avoided due to a high bandwidth "chirping" effect when applying and removing the current to the laser.

Please go through the following link

https://googleweblight.com/i?u=https://www.researchgate.net/publication/223141631_High-Speed_Semiconductor_Laser_Design_and_Performance&hl=en-IN


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