Polarization-independent optical sampling with extended wavelength range
US6898000B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2001 |
| Grant date | May 24, 2005 |
| Priority date | — |
| Expiry date | Jun 10, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A nonpolarization-dependent method and apparatus for optical sampling of a user optical signal of a known frequency range (e.g., corresponding to 1550 nm wavelength) uses a probe signal in an unsplit form and applies a conversion {e.g., by sum frequency generation (SFG)} operation in a first stage to the probe signal and to a first polarization component of the user optical signal (e.g., ‘s’ component) to produce a first component of an output signal. In a second stage, a second polarization component of the user optical signal (e.g., ‘p’ component) is rotated by 90° to align with the first polarization component and then converted by mixing with the unsplit probe signal to produce a second component of an output signal. The first and second output component signals are both added and measured using a photomultiplier tube (PMT) or an avalanche diode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.