Wavelength tunable optical filter

Details Wavelength tunable optical filter Wavelength tunable optical filter

1989-12-12

1991-06-11

Sikes, William L.

G02B 610

Patent

active

050227300

ABSTRACT:
A wavelength tunable optical filter having a characteristic single transmission peak for enhanced tunability comprises a phase control section positioned between a Distributed Bragg Reflector section and a high reflectivity mirror. The Distributed Bragg Reflector section comprises a periodic region grating positioned over an end portion of a passive waveguide whereas the phase control section comprises the portion of the passive waveguide region located between the grating and the mirror. Continuous tunability in the range of several THz may be achieved by controlling the refractive index in either the phase control or distributed Bragg reflector section. The optical filter is expected to have a frequency switching time of a few nanoseconds and, thus, is applicable to both transmission and switching applications.

REFERENCES:
patent: 4057321 (1977-11-01), Mahlein et al.
patent: 4750801 (1988-06-01), Alferness
patent: 4919507 (1990-04-01), Evans et al.
L. G. Kazovsky et al., "Distributed Bragg Reflector Optical Filters", Optical Communication (ECOC'89), The Swedish Exhibition and Congress Center, Gothenburg, Sweden, Sep. 10-14, 1989, vol. 1, pp. 25-28.
T. Numai et al., "Tunable Wavelength Filters Using 2/4-Shifted Waveguide Grating Resonators", Appl. Phys. Lett. 53 (2), 11 Jul. 1988, pp. 83-85.
T. Numai et al., "1.5 .mu.m Tunable Wavelength Filter Using a Phase-Shift-Controlled Distributed Feedback Laser Diode with a Wide Tuning Range and a High Constant Gain", Appl. Phys. Lett. 54(19), 8 May 1989, pp. 1859-1860.
H. Kobrinski et al., "Wavelength-Tunable Optical Filters: Applications and Technologies", IEEE Comm. Magazine, Oct. 1989, pp. 53-63.

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