Free-space integrated photodetector with reduced phase tracking error
US7783138B2 · kind B2 · utility
2Cited by
8References
12Claims
0Family size
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Key dates
| Filing date | Nov 14, 2008 |
| Grant date | Aug 24, 2010 |
| Priority date | — |
| Expiry date | Feb 17, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/58
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A Mach-Zehnder (MZ) interferometer modulator structure for fiberoptic telecommunications is disclosed in which drift of the operating point can be monitored with a reduced phase tracking error. One or more components of free-space light radiated into the substrate of the MZ modulator are selectively detected with one or more photodetectors. Suitable summing circuits are described for nulling out undesired photocurrent contributions in the photodetector(s) from on-state and off-state light radiated from the MZ.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.