Optical waveguides – Integrated optical circuit
Patent
1991-02-21
1992-05-26
Sikes, William L.
Optical waveguides
Integrated optical circuit
385 1, 385122, G02B 612
Patent
active
051174707
ABSTRACT:
A method for adjusting a characteristic of a guided-wave optical circuit which includes one or more waveguides formed by a substrate, a cladding layer formed on the substrate, and a core portion having one or more cores embedded in the cladding layer. The method is carried out by producing a reversible thermal hysteresis phenomenon, after the clading layer and core portion have been formed. The thermal hysteresis phenomenon is produced in a thermal hysteresis produced region preselected so as to include at least a portion of the cladding layer and/or the core portion, thereby adjusting a refractive index difference between the cladding layer and the core portion. To produce a reversible thermal hysteresis phenomenon, the following steps are carried out: raising the temperature of the thermal hysteresis produced region to a predetermined temperature; maintaining the predetermined temperature of the thermal hysteresis produced region for a predetermined time period; and cooling the thermal hysteresis produced region at a predetermined cooling rate. At least one of the values of the predetermined temperature, predetermined time period, and predetermined cooling rate is controlled so that the refractive index difference between the cladding layer and the core portion is adjusted to a desired value, thereby adjusting the characteristic of the guided-wave optical circuit.
REFERENCES:
Ourmazd, et al.; "Thermal Properties of Highly Birefringent Optical Fibers and Preforms"; Applied Optics, vol. 22, No. 15; Aug. 1983, pp. 2375-2379.
"Annealing of 517.645 Borosilicate Optical Glass: 1, Refractive Index", Neill M. Brandt, Journal of the American Ceramic Society, vol. 34, No. 11, Nov. 1951, pp. 332-338.
"Silica-Based Single-Mode Waveguides on Silicon and their Application to Guided-Wave Optical Interferometer", Norio Takato, Kaname Jinguji, Mitsuho Yasu, Hiromu Toba, and Masao Kawachi, Journal of Lightwave Technology, vol. 6, No. 6, Jun. 1988, pp. 1003-1009.
"Low-Loss High-Silica Single-Mode Channel Waveguides", N. Takato, M. Yasu, M. Kawachi, Electronics Letters, Mar. 13, 1986.
"Type Mach-Zehnder Multi/Demultiplexers", H. Uetsuka, M. Kurosawa, K. Imoto, Electronics Letters, Feb. 15, 1990, vol. 26, No. 4, pp. 251-253.
"Properties and Structure of Vitreous Silica. I", R. Bruckner, Journal on Non-Crystalline, pp. 123-175.
Inoue Yasuyuki
Kawachi Masao
Okuno Masayuki
Nippon Telegraph and Telephone Corporation
Sikes William L.
Wise Robert E.
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