Optical fiber transmission system and dichroic beam splitter the

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350166, 350173, 350174, G02B 528, G02B 2710

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active

044312580

ABSTRACT:
A dichroic beamsplitter includes two glass prisms, each having an isosceles right triangular cross section, with a multilayer dielectric coating sandwiched therebetween. Each layer of the coating is tuned for quarter-wave operation with 45.degree. incidence of light at 0.83 .mu.m. The coating comprises 53 layers of three different materials arranged in a specific order. The materials have refractive indexes of 1.45, 1.625, and 2.25 and can be, for example, silicon dioxide, aluminum oxide, and titanium oxide. An optical fiber transmission system includes an optical fiber and a beamsplitter at opposite ends thereof. One of the beamsplitters is oriented with respect to the fiber at 43.degree. incidence and has a high nonpolarizing reflectance at a wavelength .lambda..sub.2 and a low loss transmission at a wavelength .lambda..sub.1. The other beamsplitter is oriented with respect to the fiber at a 47.degree. incidence and has a high nonpolarizing reflectance at the wavelength .lambda..sub.1 and a low loss transmission at the wavelength .lambda..sub.2. The value of the wavelength .lambda..sub.1 is 0.81 .mu.m and the value of the wavelength .lambda..sub.2 is 0.85 .mu.m. A combination, including a dichroic beamsplitter having a high nonpolarizing reflectance at the wavelength .lambda..sub.2 and low loss transmission at the wavelength .lambda..sub.1, has a signal at the wavelength .lambda..sub.1 to one side thereof. An optic fiber receives the signal to the wavelength .lambda..sub.1 at an opposite side of the beamsplitter. A signal at the wavelength .lambda..sub.2 is provided to the beamsplitter at a third side thereof, perpendicular to both aforesaid sides, so that the signal at the wavelength .lambda..sub.2 is reflected to the optic fiber for transmission therethrough. A detector for power monitoring is coupled to a fourth side of the beamsplitter, the fourth side being directly opposite to the third side thereof.

REFERENCES:
patent: 2834246 (1958-05-01), Foskett et al.
patent: 3423147 (1969-01-01), Thelen
patent: 3537306 (1970-11-01), Bedinger
patent: 4373782 (1983-02-01), Thelen
Aiden E. Roche, Alan M. Title, "Tilt Tunable . . . Filters . . . ", Appl. Opt., vol. 14, No. 3, pp. 765-770, (1975).

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