Claims
- 1. An optical system comprising an optical device having an optical device transfer function with a device pass band connected in series with a Mach-Zehnder interferometric filter having a substantially aperiodic filter transfer function defining a principal pass band broader than other pass bands of such transfer function, said principal pass band of said filter transfer function being encompassed within said device pass band and having sharper cutoff than said device pass band.
- 2. A system as claimed in claim 1 wherein said aperiodic filter transfer function includes a fluctuating region in which a value of the filter transfer function fluctuates rapidly between maximum and minimum values as the wavelength of transmitted light changes, and wherein said optical device transfer function has values less than 0.5 for wavelengths in said fluctuating region of said filter transfer function.
- 3. A system as claimed in claim 2 wherein said device is an optical amplifier.
Parent Case Info
This is a divisional of application Ser. No. 08/981,169, now U.S. Pat. No. 5,946,432 filed Dec. 11, 1997. This application claims priority to and incorporates herein by reference U.S. Provisional Application Number 60/016,055 filed Apr. 18, 1996, PCT Application Number PCT/US97/06002 filed Apr. 11, 1997, and U.S. patent application Ser. No. 08/981,169 filed Dec. 11, 1997.
US Referenced Citations (6)
Non-Patent Literature Citations (4)
Entry |
Electronics Letters, Oct. 12, 1989, vol. 25, No. 21, "Unbalanced Dissimilar-Fibre Mach-Zehnder Interferomoter: Application as Filter", p. 1416-17, Malo et al. |
"Variable bandwidth and tunable centre frequency filter using transversal-form programmable optical filter", Pawlowski et al., Electronic Letters, vol. 32, No. 2, Jan. 18, 1966, pp. 113-114. |
23.sup.rd European Microwave Conf. Proc. p. 744-746, U.K. 1993. No month. |
Fiber Optic Communications, Third Edition, 1992 Joseph C. Palaris, "Light Sources", pp. 162-163. |
Divisions (1)
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981169 |
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