Positive feedback device for processing an optical signal
First Claim
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1. An electrooptical device including a positive feedback loop for conditioning an input optical signal, said positive feedback loop having an associated loop gain and comprising:
- light receiver means responsive to the input optical signal and to an internal optical signal for producing an unamplified internal electrical signal;
light emitting means having an input directly coupled to the unamplified internal electrical signal for producing the internal optical signal; and
loop gain means associated with the light emitting means for increasing the loop gain associated with the feedback loop to a maximum value greater than unity such that the power of the internal optical signal increases at a faster rate than the power of the internal electrical signal.
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Abstract
A photodiode (26) receives an optical input signal (P1) and an internal optical signal (P2) and supplies in response thereto an internal electrical signal (I2), which in turn controls a laser (4) which effects amplification and supplies the internal optical signal and an output signal (P3). The feedback loop formed by this photodiode and laser leads to a strong non-linearity in the variation of the output signal as a function of the input signal. The invention is useful especially in optical fiber telecommunications systems.
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9 Claims
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1. An electrooptical device including a positive feedback loop for conditioning an input optical signal, said positive feedback loop having an associated loop gain and comprising:
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light receiver means responsive to the input optical signal and to an internal optical signal for producing an unamplified internal electrical signal; light emitting means having an input directly coupled to the unamplified internal electrical signal for producing the internal optical signal; and loop gain means associated with the light emitting means for increasing the loop gain associated with the feedback loop to a maximum value greater than unity such that the power of the internal optical signal increases at a faster rate than the power of the internal electrical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification