Fiber optics pulse width modulator |
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| 申请号 | US3600594D | 申请日 | 1968-12-09 | 公开(公告)号 | US3600594A | 公开(公告)日 | 1971-08-17 |
| 申请人 | LOCKHEED AIRCRAFT CORP; | 发明人 | MOORE JOHN F; | ||||
| 摘要 | An optical pulse width modulator having a spiral stack of optical fibers providing a plurality of independent channels of different length for the passage of light. A suitable light source is intensity modulated in accordance with an applied electronic signal waveform and the light directed through the stack of optical fibers. The light emerging from the fibers is correlated with a waveform pattern in an optical grating and detected photoelectrically as a width modulated signal representing the correlation function between the applied electronic signal and the optical grating. | ||||||
| 权利要求 | 1. An optical pulse width modulator for processing electronic signals comprising, a light source responsive to applied electronic signals for generating light energy intensity modulated to replicate the applied signal waveform, a spiral stack of optical fibers providing a plurality of independent channels of different length for the passage of light therethrough, said fibers terminating at one end to form a light inlet and at the opposite end to form a light outlet for each channel, lens means illuminating said inlet for each channel with the intensity modulated light from said source, an optical grating at said outlet for each channel representing a desired waveform pattern contained in said applied electronic signal, and photodetector means for sensing correlation between said grating means and the light intensity pattern emerging from said channels. 2. A device as defined in claim 1 wherein at least one channel is provided for each cycle in the desired output signal. 3. A device as defined in claim 1 wherein said light source is a gallium arsenide diode. 4. A device as defined in claim 1 wherein said light source is a laser biased to lase only with the positive portions of the applied electronic signal. 5. A device as defined in claim 1 wherein said optical fibers are stacked one on the other in a single row. 6. A device as defined in claim 1 wherein said optical grating is formed by variations in length between said optical fibers at said outlet. 7. A device as defined in claim 1 wherein the outlet end of said spiral stack is planar and said optical grating is formed on a plate physically separate from the optical fibers. 8. In an optical pulse width modulator for processing electronic signals, a spiral stack of optical fibers providing a plurality of independent channels of different length for the passage of light therethrough, said fibers terminating at one end to form a light inlet and at the opposite end to form a light outlet for each channel. |
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