Optical waveguides – With optical coupler – Particular coupling structure
Patent
1990-02-05
1991-09-03
Healy, Brian
Optical waveguides
With optical coupler
Particular coupling structure
385 14, 385 16, G02B 626, G02B 612
Patent
active
050447157
ABSTRACT:
A guided-wave optical branching component is composed of a Mach-Zehnder interferometer having two or more directional couplers. A slight difference .DELTA.L in the optical-path length is provided in two or more optical waveguides connecting the two or more directional couplers. The difference of the optical-path length is less than the shortest wavelength in the operational wavelength region of the guided-wave optical branching component, and the coupling ratio of each of the two directional couplers monotonically increases with wavelength in the operational wavelength region. By using the optical branching components thus constructed (i.e., Mach-Zehnder interferometer type 3-dB optical coupler) in conjunction with a phase shifter, a Mach-Zehnder interferometer type optical switch can be achieved.
REFERENCES:
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patent: 4976512 (1990-12-01), Safaai-Jazi
patent: 4979790 (1990-12-01), Walker
Takato et al.-"Silica-Based Single-Mode Waveguides on Silicon and Their Application to Guided-Wave Optical Interferometers", Journal of Light Wave Technology vol. 6, No. 6, Jun. 1988.
Jinguji Kaname
Kawachi Masao
Takagi Akihiro
Takato Norio
Healy Brian
Nippon Telegraph and Telephone Corporation
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