1987-10-05
1989-06-13
Sikes, William L.
350 9610, 350 9615, G02B 628
Patent
active
048386367
ABSTRACT:
The invention relates to an optical star coupler comprising cascaded three-ports, a three-port being formed by branching branch circuits into a center channel, a tapered region being provided at the branch point. The star coupler can be of a compact structure and preferably has a short length.
The branch angle between the branching side circuits and the center channel is greater than/equal to 2.5.degree. and the tapered region is reduced.
REFERENCES:
patent: 4262992 (1981-04-01), Berthold, III
patent: 4484794 (1984-12-01), Witte
patent: 4515428 (1985-05-01), Findakly
patent: 4535440 (1985-08-01), Mannschke
patent: 4609252 (1986-09-01), Wong et al.
Hoffman et al., "Low-Loss Multiple-Branching Circuit Ti-Indiffused LiNbO.sub.3 Channel Waveguides", Optics Letters, vol. 9, No. 6, Jun. 1984, pp. 246-248.
Hoffman et al., "Report of the First European Conference on Integrated Optics", London, 14/15, Sep. 1981, pp. 1-3.
Findakly et al., "Single-Mode Integrated Optical 1 X N Star Coupler", Appl. Phys. Lett., 40 (7), Apr. 1, 1982, pp. 549, 550.
Bartlett Ernestine C.
Sikes William L.
U.S. Philips Corp.
Ullah Akm E.
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