Optical waveguides – With optical coupler – Particular coupling function
Patent
1995-03-13
1996-03-12
Ullah, Akm E.
Optical waveguides
With optical coupler
Particular coupling function
385 15, 359127, G02B 626
Patent
active
054993083
ABSTRACT:
A guided-wave optical multi/demultiplexer is capable of providing a wide wavelength band freely. Each of two directional couplers is constructed so that the coupling ratio of light intensity in the wavelength .lambda..sub.2 is at least 50% and the coupling ratio of light intensity in the wavelength .lambda..sub.3 having a wavelength band in close proximity to the wavelength .lambda..sub.1 is 0% or 100%, the light in the wave band containing the wavelength .lambda..sub.1 and the wavelength .lambda..sub.3 and the light in the wave band containing the wavelength .lambda..sub.2 being multiplexed and demultiplexed.
REFERENCES:
patent: 4592043 (1986-05-01), Williams
patent: 4652079 (1987-03-01), Shaw et al.
patent: 4725797 (1988-02-01), Thompson et al.
patent: 5179604 (1993-01-01), Yanagawa et al.
patent: 5418868 (1995-05-01), Cohen et al.
"Guided-Wave Optical WDM Circuit with Mach-Zehnder Interferometer configuration" by T. Kominato et al. the Journal of Institute of Electronics, Information & Communication Engr. of Japan, C-I, vol. J73-C-1, No. 5, pp. 354 to 359 issued May 1990.
Arai Hideaki
Uetsuka Hisato
Hitachi Cable Ltd.
Ullah Akm E.
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