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Steve Dods

Hello Jawad,
In the usual case, modes in a waveguide are independent, meaning that the light in one mode will propagate without affecting the light in another mode. The case where light goes from propagation in one mode to propagation in another is exceptional, usually due to some special circumstances, such as a periodic disturbance or possibly an environmental influence. Therefore mode conversion is sometimes the basis for a sensor, making it interesting for practical applications.