Method of using low bandwidth sensor for measuring high frequency AC modulation amplitude
US7502568B1 · kind B1 · utility
7Cited by
7References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 4, 2003 |
| Grant date | Mar 10, 2009 |
| Priority date | — |
| Expiry date | Apr 30, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/564
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A slow monitor diode having a bandwidth only partially overlapping a lower end of a data transmission spectrum for a data transmission laser is employed to detect and control average output power of the data transmission laser and, from peak-to-peak measurements, optical modulation amplitude. The output current from the monitor diode reaches a peak value for long runs of consecutive logical 1's or 0's. Using peak detectors with a long decay rate, the peak-to-peak signal amplitude, directly representative of optical modulation amplitude, may be determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.