Optical waveguides – With optical coupler – Input/output coupler
Patent
1992-09-11
1993-11-02
Ullah, Akm E.
Optical waveguides
With optical coupler
Input/output coupler
G02B 600, G02B 636
Patent
active
052590488
ABSTRACT:
When a light wave passes through an optical fiber used as an optical communication line, different time delays are introduced in its frequency components according to the delay characteristic of the optical fiber, limiting the usable bandwidth. An optical equalizer according to the present invention comprises a multi-stage connection of one or more unit optical circuit elements for introducing time delays opposite to the delay characteristic of the optical fiber in frequency components in the neighborhood of the transmission band used. The optical equalizer is placed at the input end of a transmission line and equalizes time delays of the frequency components passing through the transmission line, thereby expanding the usable bandwidth.
REFERENCES:
patent: 5127066 (1992-06-01), Poggiolini
patent: 5185826 (1993-02-01), Delavaux
patent: 5191631 (1993-03-01), Rosenberg
IEEE Photonics Technology Letters, vol. 2, No. 3, Mar. 1990, L. J. Cimini, et al., pp. 200-202, "Optical Equalization for High-Bit Rate Fiber-Optic Communications."
Optics Letters, vol. 16, No. 5, Mar. 1, 1991, F. Quellette, pp. 303-304, "All-Fiber Filter for Efficient Dispersion Compensation."
Post deadline papers, OFC '92, J. M. Dugan, et al., pp. 367-370, "All-Optical, Fiber-Based 1550 Dispersion Compensation in a 10 Gbit/S, 150 Km Transmission Experiment Over 1310 nm Optimized Fiber."
Kabushiki Kaisha Toshiba
Ullah Akm E.
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