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US 11,716,148 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.
Claims58
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, 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
A method, comprising:
- receiving at least one digital input word at an input, each digital input word comprising a plurality of input data bits;
- receiving an input optical signal,
- determining, based on a mapping, a digital output word comprising a plurality of output data bits mapped from a digital input word received at the input,
- 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, and
- 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;
- and
- 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.
6 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, 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.
3 more elements
A method, comprising:
- receiving at least one digital input word at an input, each digital input word comprising a plurality of input data bits;
- receiving an input optical signal,
- determining, based on a mapping, a digital output word comprising a plurality of output data bits mapped from a digital input word received at the input,
- 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;
- and
- 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 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 received successively at the digital input and having increasing values, deltas between values of digital output words mapped respectively from the first plurality of digital input words decrease,
- wherein, for a second plurality of digital input words received successively at the digital input and having increasing values, deltas between digital output words mapped respectively from the second plurality of digital input words increase, 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.
3 more elements
A method, comprising:
- receiving at least one digital input word at an input, each digital input word comprising a plurality of input data bits;
- receiving an input optical signal,
- mapping 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 received successively at the digital input and having increasing values, deltas between values of digital output words mapped respectively from the first plurality of digital input words decrease,
- wherein, for a second plurality of digital input words received successively at the digital input and having increasing values, deltas between digital output words mapped respectively from the second plurality of digital input words increase;
- and
- 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 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 received successively at the digital input and having increasing values, deltas between values of digital output words mapped respectively from the first plurality of digital input words decrease,
- wherein, for a second plurality of digital input words received successively at the digital input and having increasing values, deltas between digital output words mapped respectively from the second plurality of digital input words increase,
- wherein, for a third plurality of digital input words received successively at the digital input and having decreasing values, deltas between values of digital output words mapped respectively from the third plurality of digital input words decrease,
- wherein, for a fourth plurality of digital input words received successively at the digital input and having decreasing values, deltas between values of digital output words mapped respectively from the fourth plurality of digital input words increase,
- wherein, for a fifth plurality of digital input words received successively at the digital input and having decreasing or increasing values, deltas between values of digital output words mapped respectively from the fifth 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.
6 more elements
A method, comprising:
- receiving at least one digital input word at an input, each digital input word comprising a plurality of input data bits;
- receiving an input optical signal,
- mapping 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 received successively at the digital input and having increasing values, deltas between values of digital output words mapped respectively from the first plurality of digital input words decrease,
- wherein;
- for a second plurality of digital input words received successively at the digital input and having increasing values, deltas between digital output words mapped respectively from the second plurality of digital input words increase,
- wherein, for a third plurality of digital input words received successively at the digital input and having decreasing values;
- deltas between values of digital output words mapped respectively from the third plurality of digital input words decrease,
- wherein, for a fourth plurality of digital input words received successively at the digital input and having decreasing values, deltas between values of digital output words mapped respectively from the fourth plurality of digital input words increase, and
- wherein, for a fifth plurality of digital input words received successively at the digital input and having decreasing or increasing values, deltas between values of digital output words mapped respectively from the fifth plurality of digital input words remain the same;
- and
- 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.
10 more elements
The method of 50, wherein the modulator actuates at least one actuating electrode responsive to the digital output word.
The method of 50, wherein the one or more modulated optical signal outputs comprise analog modulated optical signals.
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 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 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 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 decreasing values, deltas between values of digital output words in the set of digital output words, corresponding respectively to digital input words in the third subset, decrease,
- wherein, for a fourth subset of digital input words specified in the mapping and having decreasing values, deltas between values of digital output words in the set of digital output words, corresponding respectively to digital input words in the fourth subset, increase,
- wherein, for a fifth subset of digital input words specified in the mapping and having increasing or decreasing values, deltas between values of digital output words in the set of digital output words, corresponding respectively to digital input words in the fifth subset, remain the same,
- wherein for any of the first, second, third, fourth, or fifth subsets, at least some of the digital input words within the subset specified in the mapping are non-contiguous, 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.
8 more elements
A method, comprising:
- receiving at least one digital input word at an input, each digital input word comprising a plurality of input data bits;
- receiving an input optical signal,
- determining, based on a mapping, a digital output word comprising a plurality of output data bits corresponding to a digital input word received at the input,
- wherein the mapping specifies, for each digital input word included in a set of possible digital input words for the plurality 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 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 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 decreasing values, deltas between values of digital output words in the set of digital output words, corresponding respectively to digital input words in the third subset, decrease,
- wherein, for a fourth subset of digital input words specified in the mapping and having decreasing values, deltas between values of digital output words in the set of digital output words, corresponding respectively to digital input words in the fourth subset, increase,
- wherein, for a fifth subset of digital input words specified in the mapping and having increasing or decreasing values, deltas between values of digital output words in the set of digital output words, corresponding respectively to digital input words in the fifth subset, remain the same, and
- wherein for any of the first, second, third, fourth, or fifth subsets, at least some of the digital input words within the subset specified in the mapping are non-contiguous;
- and
- 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.
9 more elements
Dependencies are inferred from the claim text.