Method and apparatus for separating a first optical control radi

Details Method and apparatus for separating a first optical control radi Method and apparatus for separating a first optical control radi

1992-02-24

1993-11-02

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369110, 369112, G11B 709

Patent

active

052589676

ABSTRACT:
In the read/write head of an optical storage system, a bi-direction grating coupler is used to replace optical components normally found in the read/write head. The use of the bi-directional grating coupler reduces the bulk and weight of the read/write head. The two channels of the bi-directional grating coupler can be used to separate a radiation component that can used to provide a tracking control signal from a radiation component that can be used to provide a focus control signal. One of the channels is also used to provide the radiation component from which the data on the storage medium can be identified. The bi-directional coupler can be implemented by two grating couplers, each grating coupler having a thin film associated therewith and each grating coupler diverting a selected radiation portion into the associated thin film. The bi-directional grating coupler can be implemented using a single grating with tapered thin film surfaces, the taper separating the selected radiation components into selected portions of the thin film. The tapered thin film surface broadens the wavelength response of the associated grating. In either embodiment, a reflection diffraction grating can be inserted in the optical path to compensate for shifts in the radiation wavelength.

REFERENCES:
patent: 4672187 (1987-06-01), Fujita et al.
patent: 4868803 (1989-09-01), Sunagawa et al.
patent: 4945525 (1990-07-01), Yamamoto et al.
patent: 5146080 (1992-09-01), Opheij

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