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US 12,191,912 B2Granted
Linearized optical digital-to-analog modulator
AssigneeRamot at Tel-Aviv University Ltd.
InventorsYossef Ehrlichman, Ofer Amrani, Shlomo Ruschin
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Abstract
In a system for converting digital data into a modulated optical signal, an electrically controllable device, including a modulator having one or more actuating electrodes, provides an analog-modulated optical signal that is modulated in response to output data bits of a digital-to-digital mapping. A digital-to-digital conversion provides the mapping of input data words to the output data bits. The mapping enables adjustments to correct for non-linearities and other undesirable characteristics, thereby improving signal quality.
Claims29
An optical modulation system, the system comprising:
- an input for receiving digital input words, each digital input word comprising a plurality of input data bits;
- an input optical signal,
- wherein the optical modulation system, based on a mapping, maps a digital input word received at the input to a corresponding digital output word comprising a plurality of output data bits,
- wherein the mapping specifies, for each digital input word included in a set of possible digital input words for the plurality of input data bits, a corresponding digital output word from a set of possible digital output words for the plurality of output data bits,
- wherein, for a first subset of digital input words specified in the mapping and having increasing values, deltas between values of digital output words in the set of possible digital output words, corresponding respectively to digital input words in the first subset, decrease,
- wherein, for a second subset of digital input words specified in the mapping and having increasing values, deltas between values of digital output words in the set of possible digital output words, corresponding respectively to digital input words in the second subset, increase,
- wherein, for a third subset of digital input words specified in the mapping and having increasing values, deltas between values of digital output words in the set of possible digital output words, corresponding respectively to digital input words in the third subset, remain the same and
- wherein the optical modulation system further comprises a modulator for modulating the input optical signal responsively to the digital output word mapped from the digital input word, thereby generating one or more modulated optical signal outputs for transmission over one or more optical fibers.
5 more elements
An optical modulation system, the system comprising:
- an input for receiving digital input words, each digital input word comprising a plurality of input data bits;
- an input optical signal,
- wherein the optical modulation system, based on a mapping, maps a digital input word received at the input to a corresponding digital output word comprising a plurality of output data bits,
- wherein, for a first plurality of digital input words applied to the mapping and having increasing values, values of digital output words, corresponding respectively to the first plurality of digital input words, decrease,
- wherein, for a second plurality of digital input words applied to the mapping and having increasing values, values of digital output words, corresponding respectively to the second plurality of digital input words, increase,
- wherein, for a third plurality of digital input words applied to the mapping and having increasing values, values of digital output words, corresponding respectively to the third plurality of digital input words, remain the same, and
- wherein the optical modulation system further comprises a modulator for modulating the input optical signal responsively to the digital output word mapped from the digital input word, thereby generating one or more modulated optical signal outputs for transmission over one or more optical fibers.
4 more elements
An optical modulation system, the system comprising:
- an input for receiving digital input words, each digital input word comprising a plurality of input data bits;
- an input optical signal,
- wherein the optical modulation system, based on a mapping, maps a digital input word received at the input to a corresponding digital output word comprising a plurality of output data bits,
- wherein the mapping specifies, for each digital input word included in a set of possible digital input words for the plurality of input data bits, a corresponding digital output word from a set of possible digital output words for the plurality of output data bits,
- wherein for two successive input words specified in the mapping, a voltage level responsive to the corresponding output words is either increased, decreased, or maintained the same to approximate to a desired modulation of an optical signal output as a function of the digital input word;
- and
- wherein the voltage level responsive to the corresponding output words is applied to at least one electrode of a modulator, thereby generating one or more modulated optical signal outputs for transmission over one or more optical fibers.
4 more elements
An optical modulation system, the system comprising:
- an input for receiving digital input words, each digital input word comprising a plurality of input data bits;
- an input optical signal,
- wherein the optical modulation system, based on a mapping, maps a digital input word received at the input to a corresponding digital output word comprising a plurality of output data bits,
- wherein the mapping specifies, for each digital input word included in a set of possible digital input words for the plurality of input data bits, a corresponding digital output word from a set of possible digital output words for the plurality of output data bits,
- wherein for two successive input words applied to the mapping, a voltage level responsive to the corresponding output words is either increased, decreased, or maintained the same to approximate to a desired modulation of an optical signal output as a function of the digital input word;
- and
- wherein the voltage level responsive to the corresponding output words is applied to at least one electrode of a modulator, thereby generating one or more modulated optical signal outputs for transmission over one or more optical fibers.
4 more elements
An optical modulation system, the system comprising:
- an input for receiving digital input words, each digital input word comprising a plurality of input data bits;
- an input optical signal,
- wherein the optical modulation system, based on a mapping, maps a digital input word received at the input to a corresponding digital output word comprising a plurality of output data bits,
- wherein the mapping specifies, for each digital input word included in a set of possible digital input words for the plurality of input data bits, a corresponding digital output word from a set of possible digital output words for the plurality of output data bits,
- wherein for two successive input words received at the digital input, a voltage level responsive to the corresponding output words is either increased, decreased, or maintained the same to approximate to a desired modulation of an optical signal output as a function of the digital input word;
- and
- wherein the voltage level responsive to the corresponding output words is applied to at least one electrode of a modulator, thereby generating one or more modulated optical signal outputs for transmission over one or more optical fibers.
4 more elements
Dependencies are inferred from the claim text.