Optical communication device
An optical communication device may include a driver component, arranged to achieve a driving voltage, and a modulator component, including a laser or arranged to receive light from a laser. The modulator component may be arranged to achieve a modulated light signal modulated based on the driving voltage. The device may include a transmission line arranged to transfer the driving voltage between the driver component and the modulator component. The transmission line may not impedance matched to the driver component, the transmission line may have an impedance which is at least 20% lower than an output impedance of the driver component, and the transmission line may be impedance matched with respect to signal reflections to the modulator component.
1. An optical communication device comprising:
a driver component, arranged to achieve a driving voltage;
a modulator component, comprising or arranged to receive light from a laser, the modulator component being arranged to achieve a modulated light signal modulated based on the driving voltage; and
a transmission line, arranged to transfer the driving voltage between the driver component and the modulator component;
wherein the transmission line is not impedance matched to the driver component, the transmission line has an impedance which is at least 20% lower than an output impedance of the driver component, and the transmission line is impedance matched with respect to signal reflections to the modulator component.
2. The optical communication device according to claim 1 , wherein the impedance of the transmission line is present across a frequency interval of 50 kHz-25 GHz.
3. The optical communication device according to claim 1 , wherein the transmission line is impedance matched to the modulator component with respect to signal reflections across a frequency interval of at least 50 kHz-25 GHz.
4. The optical communication device according to claim 1 , further comprising an impedance matching network coupled to a modulator of the modulator component, wherein the impedance matching network is arranged to achieve the impedance matching between the transmission line and the modulator component.
5. The optical communication device according to claim 1 , wherein the transmission line has an impedance which is at least 40% of the output impedance of the driver component.
6. The optical communication device according to claim 5 , wherein the transmission line has an impedance which is between 50% and 70% of the output impedance of the driver component.
7. The optical communication device according to claim 6 , wherein the transmission line has an impedance which is between 55% and 65% of the output impedance of the driver component.
8. The optical communication device according to claim 1 , wherein the output impedance of the driver component is between 90 and 110 ohms differential or between 45 and 55 ohms single-ended.
9. The optical communication device according to claim 1 , wherein the impedance of the transmission line is between 40 and 80 ohms differential or between 20 and 40 ohms single-ended.
10. The optical communication device according to claim 1 , wherein the driver component is connected to the transmission line without any intermediate components with non-negligible impedance.
11. The optical communication device according to claim 1 , wherein the transmission line is at least 1 mm of length.
12. The optical communication device according to claim 1 , wherein modulation of the optical communication device is a conventional 25, 56 or 100 Gb/s, corresponding to 25G, 50G and 100G, non-return to zero modulation.
13. The optical communication device according to claim 1 , wherein the modulator component is arranged to modulate the modulated light signal across a frequency spectrum of at least 25 Gb/s.
14. The optical communication device according to claim 1 , wherein the laser is a tunable laser.
15. The optical communication device according to claim 1 , wherein the driver component and the modulator component are discreet components.
16. The optical communication device according to claim 1 , wherein the transmission line being impedance matched with respect to signal reflections to the modulator component results in fewer reflections at an intersection between the transmission line and the modulator component.
17. The optical communication device according to claim 1 , wherein the impedance matching minimizes intersection reflection boundaries such that an output impedance is substantially the same as an input impedance.
18. The optical communication device according to claim 1 , wherein the modulator component is a Mach-Zehnder modulator producing a non-return to zero modulation.