WAVELENGTH-CORRECTIVE LIGHT SOURCE APPARATUS AND METHOD
First Claim
1. A wavelength-corrective light source apparatus comprising:
- a light source configured to emit light characterized by a wavelength spectrum having a centroid wavelength with a centroid wavelength operational sensitivity;
a wavelength-sensitive photodetector having a unitary active area characterized by a plurality of different responsivity spectra, the wavelength-sensitive photodetector configured to detect the light and to deliver a plurality of different wavelength constituent photocurrent signals in response to the detected light corresponding to the plurality of different responsivity spectra; and
a centroid wavelength correction circuit configured to receive and act on the plurality of different wavelength constituent photocurrent signals to compensate for the centroid wavelength operational sensitivity.
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Abstract
A wavelength-corrective light source apparatus, and corresponding method, includes a light source emitting light characterized by a wavelength spectrum having a centroid wavelength with a centroid wavelength operational sensitivity. The apparatus also includes a wavelength-sensitive photodetector having a unitary active area characterized by a plurality of different responsivity spectra. The photodetector is configured to detect the light and deliver a plurality of different wavelength constituent photocurrent signals in response to the detected light corresponding to the different responsivity spectra. The apparatus further includes a centroid wavelength correction circuit configured to receive and act on the plurality of different wavelength constituent photocurrent signals to compensate for the centroid wavelength operational sensitivity. The photocurrent signals may have a nonlinearity with respect to the centroid wavelength, and nonlinearity cancellation can be provided. A nonlinearity corrected fiber-optic gyroscope may include the light source apparatus.
2 Citations
20 Claims
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1. A wavelength-corrective light source apparatus comprising:
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a light source configured to emit light characterized by a wavelength spectrum having a centroid wavelength with a centroid wavelength operational sensitivity; a wavelength-sensitive photodetector having a unitary active area characterized by a plurality of different responsivity spectra, the wavelength-sensitive photodetector configured to detect the light and to deliver a plurality of different wavelength constituent photocurrent signals in response to the detected light corresponding to the plurality of different responsivity spectra; and a centroid wavelength correction circuit configured to receive and act on the plurality of different wavelength constituent photocurrent signals to compensate for the centroid wavelength operational sensitivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A wavelength-corrective fiber-optic gyroscope (FOG) apparatus comprising:
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a light source configured to emit light characterized by a wavelength spectrum having a centroid wavelength with a centroid wavelength operational sensitivity; a wavelength-sensitive photodetector having a unitary active area characterized by a plurality of different responsivity spectra, the wavelength-sensitive photodetector configured to detect the light and to deliver a plurality of different wavelength constituent photocurrent signals in response to the detected light corresponding to the plurality of different responsivity spectra; a centroid wavelength correction circuit configured to receive and act on the plurality of different wavelength constituent photocurrent signals to correct for the operational sensitivity; and a light coupler configured to couple the light from the light source into a coil of optical fiber. - View Dependent Claims (17, 18, 19)
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20. A method of correcting a light source wavelength, the method comprising:
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detecting emitted light at a unitary active area of a wavelength-sensitive photodetector, the unitary active area characterized by a plurality of different responsivity spectra, and the emitted light characterized by a wavelength spectrum having a centroid wavelength with a centroid wavelength operational sensitivity; delivering, from the wavelength-sensitive photodetector, a plurality of different wavelength constituent photocurrent signals in response to the detected light corresponding to the plurality of different responsivity spectra; and acting on the plurality of different wavelength constituent photocurrent signals to compensate for the centroid wavelength operational sensitivity.
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Specification