Arrangement for monitoring the emission wavelength and power of an optical source
An arrangement for monitoring the main radiation beam emitted by an optical source such as a laser diode ( 10 ) having a nominal emission wavelength, includes first ( 18 ) and second ( 20 ) photodetectors as well as a wavelength selective element ( 22 ). A beam splitter module ( 16 ) is provided for...
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| creator | Lano, Roberto Delpiano, Franco |
| description | An arrangement for monitoring the main radiation beam emitted by an optical source such as a laser diode (
10
) having a nominal emission wavelength, includes first (
18
) and second (
20
) photodetectors as well as a wavelength selective element (
22
). A beam splitter module (
16
) is provided for splitting a secondary beam from the main radiation beam of the laser source and directing it towards the first (
18
) photodetector via the associated wavelength selective element (
22
). The wavelength selective element (
22
) has a wavelength selective transmittance-reflectance characteristic, whereby said secondary beam is partly propagated towards said first (
18
) photodetector and partly reflected from said wavelength selective element (
22
) towards the second (
20
) photodetector. The output signals (
18
a,
20
a) from the photodiodes (
18, 20
) have intensities whose behaviours as a function of wavelength are complementary to each other. Signal processing circuitry (
32
) is further provided including an adder module (
26
) and subtractor module (
28
) fed with the output signals from the photodiodes
818, 20
) to generate:
a wavelength-independent sum signal (
26
a; ?A1+?B1), indicative of the intensity of the optical radiation generated by the optical source (
10
), and
a wavelength-dependent difference signal (
28
a; ?′A1−?′B1), indicative of the difference between the actual wavelength of the radiation generated by said optical source (
10
) and its nominal emission wavelength. |
| format | Patent |
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10
) having a nominal emission wavelength, includes first (
18
) and second (
20
) photodetectors as well as a wavelength selective element (
22
). A beam splitter module (
16
) is provided for splitting a secondary beam from the main radiation beam of the laser source and directing it towards the first (
18
) photodetector via the associated wavelength selective element (
22
). The wavelength selective element (
22
) has a wavelength selective transmittance-reflectance characteristic, whereby said secondary beam is partly propagated towards said first (
18
) photodetector and partly reflected from said wavelength selective element (
22
) towards the second (
20
) photodetector. The output signals (
18
a,
20
a) from the photodiodes (
18, 20
) have intensities whose behaviours as a function of wavelength are complementary to each other. Signal processing circuitry (
32
) is further provided including an adder module (
26
) and subtractor module (
28
) fed with the output signals from the photodiodes
818, 20
) to generate:
a wavelength-independent sum signal (
26
a; ?A1+?B1), indicative of the intensity of the optical radiation generated by the optical source (
10
), and
a wavelength-dependent difference signal (
28
a; ?′A1−?′B1), indicative of the difference between the actual wavelength of the radiation generated by said optical source (
10
) and its nominal emission wavelength.</description><language>eng</language><creationdate>2004</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/20040022282$$EPDF$$P50$$Guspatents$$Hfree_for_read</linktopdf><link.rule.ids>230,308,776,869,881,64032</link.rule.ids><linktorsrc>$$Uhttps://patentcenter.uspto.gov/applications/10389021$$EView_record_in_USPTO$$FView_record_in_$$GUSPTO$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Lano, Roberto</creatorcontrib><creatorcontrib>Delpiano, Franco</creatorcontrib><title>Arrangement for monitoring the emission wavelength and power of an optical source</title><description>An arrangement for monitoring the main radiation beam emitted by an optical source such as a laser diode (
10
) having a nominal emission wavelength, includes first (
18
) and second (
20
) photodetectors as well as a wavelength selective element (
22
). A beam splitter module (
16
) is provided for splitting a secondary beam from the main radiation beam of the laser source and directing it towards the first (
18
) photodetector via the associated wavelength selective element (
22
). The wavelength selective element (
22
) has a wavelength selective transmittance-reflectance characteristic, whereby said secondary beam is partly propagated towards said first (
18
) photodetector and partly reflected from said wavelength selective element (
22
) towards the second (
20
) photodetector. The output signals (
18
a,
20
a) from the photodiodes (
18, 20
) have intensities whose behaviours as a function of wavelength are complementary to each other. Signal processing circuitry (
32
) is further provided including an adder module (
26
) and subtractor module (
28
) fed with the output signals from the photodiodes
818, 20
) to generate:
a wavelength-independent sum signal (
26
a; ?A1+?B1), indicative of the intensity of the optical radiation generated by the optical source (
10
), and
a wavelength-dependent difference signal (
28
a; ?′A1−?′B1), indicative of the difference between the actual wavelength of the radiation generated by said optical source (
10
) and its nominal emission wavelength.</description><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2004</creationdate><recordtype>patent</recordtype><sourceid>EFI</sourceid><recordid>eNqVjbEKAjEQRK-xEPUftrUQQrSwFVFsBftjOTd3gWQ3ZPe83zeFP2A1DLx5s-6el1qRR8rEBkEqZOFoUiOPYBMB5agahWHBDyXi0SZAfkORhSpIaAWkWBwwgcpcB9p2q4BJaffLTbe_317Xx2HWgtZutMdSUltY82rvnTs5570_--M_7BclAz7z</recordid><startdate>20040205</startdate><enddate>20040205</enddate><creator>Lano, Roberto</creator><creator>Delpiano, Franco</creator><scope>EFI</scope></search><sort><creationdate>20040205</creationdate><title>Arrangement for monitoring the emission wavelength and power of an optical source</title><author>Lano, Roberto ; Delpiano, Franco</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-uspatents_applications_200400222823</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2004</creationdate><toplevel>online_resources</toplevel><creatorcontrib>Lano, Roberto</creatorcontrib><creatorcontrib>Delpiano, Franco</creatorcontrib><collection>USPTO Published Applications</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Lano, Roberto</au><au>Delpiano, Franco</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Arrangement for monitoring the emission wavelength and power of an optical source</title><date>2004-02-05</date><risdate>2004</risdate><abstract>An arrangement for monitoring the main radiation beam emitted by an optical source such as a laser diode (
10
) having a nominal emission wavelength, includes first (
18
) and second (
20
) photodetectors as well as a wavelength selective element (
22
). A beam splitter module (
16
) is provided for splitting a secondary beam from the main radiation beam of the laser source and directing it towards the first (
18
) photodetector via the associated wavelength selective element (
22
). The wavelength selective element (
22
) has a wavelength selective transmittance-reflectance characteristic, whereby said secondary beam is partly propagated towards said first (
18
) photodetector and partly reflected from said wavelength selective element (
22
) towards the second (
20
) photodetector. The output signals (
18
a,
20
a) from the photodiodes (
18, 20
) have intensities whose behaviours as a function of wavelength are complementary to each other. Signal processing circuitry (
32
) is further provided including an adder module (
26
) and subtractor module (
28
) fed with the output signals from the photodiodes
818, 20
) to generate:
a wavelength-independent sum signal (
26
a; ?A1+?B1), indicative of the intensity of the optical radiation generated by the optical source (
10
), and
a wavelength-dependent difference signal (
28
a; ?′A1−?′B1), indicative of the difference between the actual wavelength of the radiation generated by said optical source (
10
) and its nominal emission wavelength.</abstract><oa>free_for_read</oa></addata></record> |
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| title | Arrangement for monitoring the emission wavelength and power of an optical source |
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