Topology structure of the mode multiplexer device Sample Clauses

Topology structure of the mode multiplexer device. The inset shows the principle to excite the LP11ay mode. 3.1. The same principle is applied to excite the other LP11 modes for CH2, CH7 and CH8. For CH3, light is first split into two beams by a 2×2 MMI. With extra π/2 phase shift, the two beams are injected into the following two 2×2 MMIs respectively with phase difference of π. Each beam is then split into two beams afterwards by the corresponding 2×2 MMI, and injected into the corresponding grating couplers. The phases of these four beams in the grating coupler no.1~no.4 will be (0, π, 0, π) polarizing at vertical direction, and LP21ay can be excited. While light from the CH4 is split to four beams being injected into grating coupler no.1~no.4 with the same phase, and LP01y can be excited. The same methods can be applied to excite the other LP01x and LP21ax modes.
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