US 12,092,872 B2
Wavelength division multiplexer and demultiplexer
Yung-Jr Hung, Kaohsiung (TW); and Tzu-Hsiang Yen, Kaohsiung (TW)
Assigned to NATIONAL SUN YAT-SEN UNIVERSITY, Kaohsiung (TW)
Filed by NATIONAL SUN YAT-SEN UNIVERSITY, Kaohsiung (TW)
Filed on Sep. 20, 2022, as Appl. No. 17/933,487.
Claims priority of application No. 111101582 (TW), filed on Jan. 14, 2022.
Prior Publication US 2023/0228944 A1, Jul. 20, 2023
Int. Cl. G02B 6/293 (2006.01)
CPC G02B 6/29355 (2013.01) [G02B 6/2938 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A wavelength division multiplexer and demultiplexer, comprising:
a waveguide structure, comprising:
a first-stage Mach-Zehnder interferometer (MZI) structure having two input terminals and two output terminals, wherein one of the input terminals is configured to receive an input optical beam with a first center wavelength and a second center wavelength, and wherein the output terminals are configured to transmit one first-stage output optical beam with the first center wavelength and another first-stage output optical beam with the second center wavelength, respectively; and
two second-stage MZI structures, wherein one input terminal of one of the second-stage MZI structures and one input terminal of the other second-stage MZI structure are configured to respectively receive the first-stage output optical beams, one output terminal of one of the second-stage MZI structures and one output terminal of the other second-stage MZI structure are configured to transmit one second-stage output optical beam with the first center wavelength and another second-stage output optical beam with the second center wavelength, respectively, and each second-stage MZI structure is configured in cross-state condition such that the one second-stage output optical beam and the one first-stage output optical beam are not in the same optical waveguide path, the another second-stage output optical beam and the another first-stage output optical beam are not in the same optical waveguide path, and no optical beam is outputted through an other output terminal of each second-stage MZI structure.