Polarization-independent optical sampling with extended...

Details Polarization-independent optical sampling with extended... Polarization-independent optical sampling with extended...

2005-05-24

2005-05-24

Lee, John D. (Department: 2874)

Optical: systems and elements

Optical frequency converter

Harmonic generator

C359S490020

Reexamination Certificate

active

06898000

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.

REFERENCES:
patent: 6661577 (2003-12-01), Wu et al.
patent: 6744508 (2004-06-01), Jungerman et al.

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