Patent US6711190B2 successfully refreshed from Google Patents.
US6711190B2
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US
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Laser transmitter bias circuit
Assignee: Koninklijke Philips NV
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Filing: 2001-06-29
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Granted: 2004-03-23
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Expires: 2021-06-29
Abstract
Abstract A laser transmitter bias circuit for a laser diode transmitter, for use in a optical transmission system, e.g. in commercial CATV systems. The laser transmitter bias circuit reduces power consumption and heat dissipation by eliminating the conventional need for a distinct constant DC current supply for biasing the laser diode. Radio frequency (RF) circuitry, e.g., a radio frequency amplifier (e.g., a Hybrid Amplifier), connected in series to the laser diode supplies both a DC bias-current (I B ) and an RF drive-current (I P ) through the laser diode. The DC bias current through the laser diode in turn powers (and/or biases) the radio frequency amplifier and, optionally, other radio frequency circuitry. An optional diode-bypass current (I BP ) path may be connected in parallel with the laser diode, and in series with the radio frequency amplifier to control bias current.
Inventors
- 👤 Marcel F. C. Schemmann
- 👤 Venkatesh G. Mutalik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:51
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/04; H01S5/042; H01S5/0427
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
76 words
A laser transmitter bias circuit comprising: a laser diode having a DC bias-current (I B ) and a radio frequency (RF) modulated RF drive-current (I P ); and a drive-current supply unit adapted to pass the DC bias-current (I B ) and the RF drive-current (I P ) through said laser diode, wherein said drive-current supply unit includes a single amplifier that provides the RF drive-current (I P ) and the DC bias-current (I B ).
Claim 2
Dependent Claim
76 words
A laser transmitter bias circuit comprising: a laser diode having a DC bias-current (I B ) and a radio frequency (RF) modulated RF drive-current (I P ); and a drive-current supply unit adapted to pass the DC bias-current (I B ) and the RF drive-current (I P ) through said laser diode, wherein said drive-current supply unit includes a single amplifier that provides the RF drive-current (I P ) and the DC bias-current (I B ).
Claim 3
Dependent Claim
41 words
The circuit of claim 1 , wherein the output stage of said single amplifier includes at least one RF-controlled transistor that passes the RF drive-current (I P ) and passes at least a portion of the DC bias-current (I B ).
Claim 4
Dependent Claim
39 words
The circuit of claim 1 , wherein the output stage of said single amplifier includes a RF push-pull amplifier that passes the RF drive-current (I P ) and passes a first portion of the DC bias-current (I B ).
Claim 5
Dependent Claim
28 words
The circuit of claim 3 , wherein the push-pull amplifier has magnetically coupled dual primary coils that pass the first portion of the DC bias-current (I B ).
Claim 6
Dependent Claim
24 words
The circuit of claim 4 , wherein the push-pull amplifier has a magnetically coupled secondary coil that passes the RF drive-current (I P ).
Claim 7
Dependent Claim
27 words
The circuit of claim 3 , wherein the push-pull amplifier has asymmetrical magnetically coupled coils that pass the first portion of the DC bias-current (I B ).
Claim 8
Dependent Claim
28 words
The circuit of claim 3 , wherein the push-pull amplifier has two symmetrical RF switching transistors that pass the first portion of the DC bias-current (I B ).
Claim 9
Dependent Claim
65 words
A laser transmitter bias circuit comprising: a laser diode having a DC bias-current (I B ) and an RF drive-current (I P ); and a push-pull (Hybrid) RF amplifier connected in series with the laser diode between the supply voltage (V DD ) and ground, wherein the push-pull (Hybrid) RF amplifier provides the RF drive-current (I P ) and the DC bias-current (I B ).
Claim 10
Dependent Claim
65 words
A laser transmitter bias circuit comprising: a laser diode having a DC bias-current (I B ) and an RF drive-current (I P ); and a push-pull (Hybrid) RF amplifier connected in series with the laser diode between the supply voltage (V DD ) and ground, wherein the push-pull (Hybrid) RF amplifier provides the RF drive-current (I P ) and the DC bias-current (I B ).
Claim 11
Dependent Claim
28 words
The circuit of claim 8 , wherein the push-pull (Hybrid) RF amplifier passes the RF drive-current (I P ) and all of the DC bias-current (I B ).
Claim 12
Dependent Claim
15 words
The circuit of claim 8 , wherein the push-pull (Hybrid) RF amplifier is substantially symmetrical.
Claim 13
Dependent Claim
14 words
The circuit of claim 8 , wherein the push-pull (Hybrid) RF amplifier is asymmetrical.
Claim 14
Dependent Claim
49 words
The circuit of claim 8 , further comprising a diode-bypass current (I BP ) path, wherein the diode-bypass current (I BP ) path is connected in parallel with the laser diode, and the diode-bypass current (I BP ) path is connected in series with the push-pull (Hybrid) RF amplifier.
Claim 15
Dependent Claim
24 words
The circuit of claim 8 , wherein a diode-bypass current (I BP ) passing through the diode-bypass current (I BP ) path is variable.
Claim 16
Dependent Claim
111 words
A laser transmitter bias circuit comprising: a laser diode having a DC bias-current (I B ) and an RF drive-current (I P ); a drive-current supply unit for passing the DC bias-current (I B ) and the RF drive-current (I P ) through said laser diode, wherein said drive-current supply unit includes a single amplifier that provides the RF drive-current (I P ) and the DC bias-current (I B ); and a diode-bypass current (I BP ) path, wherein the diode-bypass current (I BP ) path is connected in parallel with the laser diode, and the diode-bypass current (I BP ) path is connected in series with the drive-current supply unit.
Claim 17
Dependent Claim
111 words
A laser transmitter bias circuit comprising: a laser diode having a DC bias-current (I B ) and an RF drive-current (I P ); a drive-current supply unit for passing the DC bias-current (I B ) and the RF drive-current (I P ) through said laser diode, wherein said drive-current supply unit includes a single amplifier that provides the RF drive-current (I P ) and the DC bias-current (I B ); and a diode-bypass current (I BP ) path, wherein the diode-bypass current (I BP ) path is connected in parallel with the laser diode, and the diode-bypass current (I BP ) path is connected in series with the drive-current supply unit.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2007-03-23 | 2007-09-22 | 2008-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-03-23 | 2011-09-22 | 2012-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-03-23 | 2015-09-22 | 2016-03-23 | $7700.00 | Window Closed / Lapsed |