TW267275B - In-line predistorter for linearization of electronic and optical signals - Google Patents
In-line predistorter for linearization of electronic and optical signalsInfo
- Publication number
- TW267275B TW267275B TW084105966A TW84105966A TW267275B TW 267275 B TW267275 B TW 267275B TW 084105966 A TW084105966 A TW 084105966A TW 84105966 A TW84105966 A TW 84105966A TW 267275 B TW267275 B TW 267275B
- Authority
- TW
- Taiwan
- Prior art keywords
- predistortion
- distortion
- line
- real
- component
- Prior art date
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- Optical Communication System (AREA)
- Networks Using Active Elements (AREA)
- Filters And Equalizers (AREA)
Abstract
An electronic circuit provides a linear output from a nonlinear transmission device such as a laser. Second and higher order distortion of the nonlinear device is compensated by applying a predistorted signal equal in magnitude and opposite in sign to the real and imaginary components of distortion produced by the nonlinear device. The input signal for the nonlinear device is applied to an in-line electrical path coupled to the nonlinear device. The in-line path contains at least one component for generating primarily real components of distortion. In some applications, at least one component for generating imaginary components of distortion is located on the in-line path. Filter stages are used to provide frequency dependent predistortion. In a preferred embodiment, an attenuator, a MMIC amplifier, a CATV hybrid amplifier, and a varactor in line with a semiconductor laser, provide the predistorted signal. In another embodiment, the real component of predistortion is generated by a FET configured as a voltage controlled resistor. In still another embodiment, the real component of predistortion is generated by the parallel combination of a diode and a resistor connected in series with the RF signal path. Also provided is a separate circuit including antiparallel diodes and reactive elements for generating frequency dependent third-order predistortion.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US24587894A | 1994-05-19 | 1994-05-19 | |
PCT/US1995/006352 WO1995032561A1 (en) | 1994-05-19 | 1995-05-19 | In-line predistorter for linearization of electronic and optical signals |
Publications (1)
Publication Number | Publication Date |
---|---|
TW267275B true TW267275B (en) | 1996-01-01 |
Family
ID=51452931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW084105966A TW267275B (en) | 1994-05-19 | 1995-06-12 | In-line predistorter for linearization of electronic and optical signals |
Country Status (1)
Country | Link |
---|---|
TW (1) | TW267275B (en) |
-
1995
- 1995-06-12 TW TW084105966A patent/TW267275B/en active
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