Laser diode module
First Claim
1. A laser diode module comprising:
- a rectangular box-shaped metal casing with a bottom, two long and two short side walls, a tubular passage for a glass fiber being provided in one of the short side walls, and in which at least six guide pins are passed through the bottom in a standardized DIL order, at least one of the guide pins being inserted in the bottom by means of an electrically conductive material and the remaining guide pins being inserted in the bottom by means of feedthrough insulators;
a sheet-like metal base carrier having a electrically conductive coupling with the casing, on which base carrier are mounted a first subcarrier with a laser diode attached to it, a support for mounting the glass fiber in a manner such that its end faces the front facet of the laser diode, and a second subcarrier with the photodiode attached to it; and
connecting lines for electrically connecting the laser diode, the photodiode and the metal base carrier to the respective guide pins, characterized in that the guide pin for electrically connecting the laser diode, which pin is inserted in the bottom by means of a feedthrough insulator, forms, only inside the casing and substantially throughout its entire length inside the casing, the inner guide of a coaxial transmission line whose outer guide is electrically conductively connected to the casing, and in the connecting line between the linear guide and the laser diode a resistor is inserted having a value such that the sum of the resistances of this resistor and the laser diode is substantially equal to the characteristic impedance of the coaxial transmission line.
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Accused Products
Abstract
A laser diode module includes a rectangular box-shaped metal casing having a bottom (B), an even number of guide pins (1-14) being led through the bottom (B) in a standardized DIL order. In addition to the laser diode itself (LD) the laser diode module further includes a metal base carrier (BC) on which the laser diode (LD), a photo diode (PD) and a support (S) for the glass fiber (F) are installed. The laser diode module further includes a guide pin (9) which is inserted in the bottom (B) by means of a feedthrough insulator for electrically connecting the laser diode module to an external transmission line (MT). In order to achieve a proper matching of the laser diode module and the characteristic impedance of the external transmission line (MT), so that reflection phenomena are avoided and the laser diode module is made suitable for use in systems with considerably higher bit rates than 1 Gbit/s, the aforesaid guide pin (9) forms the inner guide of a coaxial transmission line situated inside the casing, of which transmission line the outer guide (CBL) is electrically conductively connected to the casing, whereas in the connecting line between the inner guide (9) and the laser diode (LD) a resistor (CS) is inserted having a value such that the sum of the resistances of this resistor (CS) and the laser diode (LD) is substantially equal to the characteristic impedance of the coaxial transmission line (9, CBL).
142 Citations
17 Claims
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1. A laser diode module comprising:
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a rectangular box-shaped metal casing with a bottom, two long and two short side walls, a tubular passage for a glass fiber being provided in one of the short side walls, and in which at least six guide pins are passed through the bottom in a standardized DIL order, at least one of the guide pins being inserted in the bottom by means of an electrically conductive material and the remaining guide pins being inserted in the bottom by means of feedthrough insulators; a sheet-like metal base carrier having a electrically conductive coupling with the casing, on which base carrier are mounted a first subcarrier with a laser diode attached to it, a support for mounting the glass fiber in a manner such that its end faces the front facet of the laser diode, and a second subcarrier with the photodiode attached to it; and connecting lines for electrically connecting the laser diode, the photodiode and the metal base carrier to the respective guide pins, characterized in that the guide pin for electrically connecting the laser diode, which pin is inserted in the bottom by means of a feedthrough insulator, forms, only inside the casing and substantially throughout its entire length inside the casing, the inner guide of a coaxial transmission line whose outer guide is electrically conductively connected to the casing, and in the connecting line between the linear guide and the laser diode a resistor is inserted having a value such that the sum of the resistances of this resistor and the laser diode is substantially equal to the characteristic impedance of the coaxial transmission line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification