Light beam splitting apparatus

Details Light beam splitting apparatus Light beam splitting apparatus

1994-06-10

1996-02-27

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369 4412, 385 29, 385 37, G11B 700

Patent

active

054954622

ABSTRACT:
When a laser beam enters into a grating coupler at a right angle, a guided wave with a wave mode corresponding to an incident angle can be generated. Although the guided wave is a light beam in single mode, the waveguide mode is deflected by passing through a step-wise structure and is converted into several guided waves having several modes. When the guided waves are radiated from a straight output grating coupler, the radiant angle is dependent upon the waveguide mode, so beams are radiated in different directions according to their respective waveguide modes. Therefore, a guided wave in zero-order mode outputs a radiant beam having a larger radiant angle, while a guided wave in first-order mode outputs a radiant beam having a smaller radiant angle.

REFERENCES:
patent: 3617109 (1971-11-01), Tien
patent: 5200939 (1993-04-01), Nishiwaki et al.
patent: 5208800 (1993-05-01), Isobe et al.
patent: 5247506 (1993-09-01), Sugiura

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