REFLECTION BASED SIGNAL PRE-EMPHASIS

摘要

Systems, and apparatus for adding reflection based pre-emphasis to a laser driver. In one aspect, a device includes a load (e.g. a laser) having a load impedance, a first end of a transmission line connected to the load, and a reflective impedance element connected to a second end of the transmission line. The reflective impedance element has a given impedance value that differs from the transmission line's characteristic impedance, and the characteristic impedance differs from the load impedance. This mismatch causes reflections between the reflective impedance element and the load. The reflections between the reflective impedance element and the load combine with an incident signal at the load to create a target signal having a target spectral shape.

主权项

1. A device comprising:
a load having a load impedance; a first end of a transmission line connected to the load, wherein the transmission line has a characteristic impedance that differs from the load impedance; and a reflective impedance element connected to a second end of the transmission line, wherein:
the reflective impedance element has a given impedance value that differs from the characteristic impedance;mismatches between the characteristic impedance and each of the given impedance value and the load impedance value causes reflections between the reflective impedance element and the load; andthe reflections between the reflective impedance element and the load combine with an incident signal at the load to create a signal having a target spectral shape.