Multimode Interference in Waveguides and Free Space

Multi-mode interferenceMulti-mode interference in waveguides and free spaceFree space. The chapter deals with the modes in the waveguides or free spaceFree space which propagates with different velocities and propagation constants. Interference is expected and can be used to design useful functional devices such as multi-mode interferenceMulti-mode interference couplers. Functional devices such as unitary transformers are designed based on the multi-mode interferenceMulti-mode interference concept. In free spaceFree space, the multi-mode interferenceMulti-mode interference is described as the Talbot effect, which can be exploited to generate spatial modes.