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US 8,712,252 B2Granted
Optical signal output apparatus, electrical signal output apparatus, and test apparatus
AssigneeAdvantest Corporation
InventorsShin Masuda, Kazunori Shiota
Life of this patent
Estimating the term…
Abstract
To efficiently apply jitter to an optical signal using a simple configuration, provided is an optical signal output apparatus that outputs an optical pulse pattern signal including jitter, the optical signal generating apparatus comprising a light source section that outputs an optical signal having an optical frequency corresponding to a frequency control signal; an optical modulation section that modulates the optical signal output by the light source section, according to a designated pulse pattern; and an optical jitter generating section that delays an optical signal passed by the optical modulation section according to the optical frequency, to apply jitter to the optical signal.
Claims30
An optical signal output apparatus that outputs an optical pulse pattern signal including jitter, the optical signal generating apparatus comprising:
- a light source section that outputs an optical signal having an optical frequency corresponding to a frequency control signal;
- an optical modulation section that modulates the optical signal output by the light source section, according to a designated pulse pattern;
- an optical jitter generating section that delays an optical signal passed by the optical modulation section according to the optical frequency, to apply jitter to the optical signal;
- and
- an optical intensity adjusting section that compensates for optical intensity change of the optical signal from the light source section and outputs an optical signal in which intensity change caused by change of the optical frequency is restricted, wherein
- the optical intensity adjusting section adjusts an amplification factor of the input light from the light source section, based on the frequency control signal, to restrict optical intensity change of the optical signal output by the light source section according to the frequency control signal, and outputs the resulting optical signal.
3 more elements
A test apparatus that tests a device under test including an optical modulation section that modulates an input optical signal according to a designated pulse pattern, the test apparatus comprising:
- a light source section that outputs an optical signal having an optical frequency corresponding to a frequency control signal;
- an optical intensity adjusting section that compensates for optical intensity change of the optical signal from the light source section and outputs, to the optical modulation section of the device under test, an optical signal in which intensity change caused by change of the optical frequency is restricted;
- an optical jitter generating section that delays the optical test signal passed by the optical modulation section by a delay amount corresponding to the optical frequency, to apply jitter corresponding to the optical frequency to the optical test signal;
- and
- an optical interface that transmits a plurality of optical signals output by the light source section and the optical jitter generating section to optical input sections of the device under test, receives an optical signal output by the device under test, and outputs the received optical signal, wherein
- the optical intensity adjusting section adjusts an amplification factor of the optical signal from the light source section, based on the frequency control signal, to restrict optical intensity change of the optical signal output by the light source section according to the frequency control signal, and outputs the resulting optical signal.
3 more elements
A test apparatus that tests a device under test including a device light source and an optical modulation section for modulating an optical signal input thereto according to a designated pulse pattern, the test apparatus comprising:
- a light source driving section that applies a modulated drive current to the device light source, such that the device light source outputs an optical signal having an optical frequency corresponding to a frequency control signal;
- an optical intensity adjusting section that receives, from the optical modulating section, an optical test signal obtained as a result of the modulating by the optical modulation section, compensates for optical intensity change of the received optical test signal and outputs an optical test signal in which intensity change caused by change of the optical frequency is restricted;
- an optical jitter generating section that delays the optical test signal output by the optical intensity adjusting section, according to the optical frequency, to apply jitter corresponding to the optical frequency to the optical test signal output by the optical intensity adjusting section;
- and
- an optical interface that transmits the plurality of optical test signals output by the optical jitter generating section to optical input sections of the device under test, receives the optical test signal output by the device under test, and outputs the received optical test signal, wherein
- the optical intensity adjusting section adjusts an amplification factor of the optical test signal from the optical modulation section, based on the frequency control signal, to restrict optical intensity change of the optical test signal output by the optical modulation section according to the frequency control signal, and outputs the resulting optical signal.
3 more elements
An optical signal output apparatus that outputs an optical pulse pattern signal including jitter, the optical signal generating apparatus comprising:
- a light source section that outputs an optical signal having an optical frequency corresponding to a frequency control signal;
- an optical intensity adjusting section that compensates for optical intensity change of the optical signal from the light source section and outputs an optical signal in which intensity change caused by change of the optical frequency is restricted;
- an optical modulation section that modulates the optical signal output by the optical intensity adjusting section, according to a designated pulse pattern;
- an optical jitter generating section that delays an optical signal passed by the optical modulation section according to the optical frequency, to apply jitter to the optical signal;
- and
- wherein
- the optical intensity adjusting section amplifies input light with an amplification factor corresponding to an intensity control signal having an inverse phase of the frequency control signal, and outputs the resulting optical signal.
4 more elements
An optical signal output apparatus that outputs an optical pulse pattern signal including jitter, the optical signal generating apparatus comprising:
- a light source section that outputs an optical signal having an optical frequency corresponding to a frequency control signal;
- an optical modulation section that modulates the optical signal output by the light source section, according to a designated pulse pattern;
- an optical jitter generating section that delays an optical signal passed by the optical modulation section according to the optical frequency, to apply jitter to the optical signal;
- and
- a switching section that switches whether the optical frequency of the optical signal output by the light source section corresponds to the frequency control signal.
2 more elements
A test apparatus that tests a device under test including an optical modulation section that modulates an input optical signal according to a designated pulse pattern, the test apparatus comprising:
- a light source section that outputs an optical signal having an optical frequency corresponding to a frequency control signal;
- an optical intensity adjusting section that compensates for optical intensity change of the optical signal from the light source section and outputs, to the optical modulation section of the device under test, an optical test signal in which intensity change caused by change of the optical frequency is restricted;
- an optical jitter generating section that delays the optical test signal passed by the optical modulation section by a delay amount corresponding to the optical frequency, to apply jitter corresponding to the optical frequency to the optical test signal;
- and
- an optical interface that transmits a plurality of optical signals output by the light source section and the optical jitter generating section to optical input sections of the device under test, receives an optical signal output by the device under test, and outputs the received optical signal, wherein
- the optical intensity adjusting section amplifies input light with an amplification factor corresponding to an intensity control signal having an inverse phase of the frequency control signal, and outputs the resulting optical signal.
3 more elements
A test apparatus that tests a device under test including an optical modulation section that modulates an input optical signal according to a designated pulse pattern, the test apparatus comprising:
- a light source section that outputs, to the optical modulation section of the device under test, an test optical signal having an optical frequency corresponding to a frequency control signal;
- an optical jitter generating section that delays the optical test signal passed by the optical modulation section by a delay amount corresponding to the optical frequency, to apply jitter corresponding to the optical frequency to the optical test signal;
- an optical interface that transmits a plurality of optical signals output by the light source section and the optical jitter generating section to optical input sections of the device under test, receives an optical signal output by the device under test, and outputs the received optical signal;
- and
- a switching section that switches whether the optical frequency of the optical signal output by the light source section corresponds to the frequency control signal.
2 more elements
A test apparatus that tests a device under test including a device light source and an optical modulation section for modulating an optical signal input thereto according to a designated pulse pattern, the test apparatus comprising:
- a light source driving section that applies a modulated drive current to the device light source, such that the device light source outputs an optical signal having an optical frequency corresponding to a frequency control signal;
- an optical intensity adjusting section that receives an optical test signal obtained as a result of the modulating by the optical modulation section, compensates for optical intensity change of the received optical test signal and outputs an optical signal in which intensity change caused by change of the optical frequency is restricted;
- an optical jitter generating section that delays the optical test signal output by the optical intensity adjusting section, according to the optical frequency, to apply jitter corresponding to the optical frequency to the optical test signal output by the optical intensity adjusting section;
- and
- an optical interface that transmits the plurality of optical test signals output by the optical jitter generating section to optical input sections of the device under test, receives the optical test signal output by the device under test, and outputs the received optical test signal, wherein
- the optical intensity adjusting section amplifies the optical test signal with an amplification factor corresponding to an intensity control signal having an inverse phase of the frequency control signal, and outputs the resulting optical signal.
3 more elements
A test apparatus that tests a device under test including a device light source and an optical modulation section for modulating an optical signal input thereto according to a designated pulse pattern, the test apparatus comprising:
- a light source driving section that applies a modulated drive current to the device light source, such that the device light source outputs an optical signal having an optical frequency corresponding to a frequency control signal;
- an optical jitter generating section that delays an optical test signal obtained as a result of the optical modulation section modulating and outputting the optical test signal from the device light source, according to the optical frequency;
- an optical interface that transmits a plurality of optical test signals output by the optical jitter generating section to optical input sections of the device under test, receives an optical test signal output by the device under test, and outputs the received optical test signal;
- and
- a switching section that switches whether the optical frequency of the optical signal output by the light source section corresponds to the frequency control signal.
2 more elements
Dependencies are inferred from the claim text.