Optical: systems and elements – Optical demodulator
Reexamination Certificate
2006-05-09
2006-05-09
Lee, John D. (Department: 2874)
Optical: systems and elements
Optical demodulator
C359S246000, C398S205000, C398S207000
Reexamination Certificate
active
07042629
ABSTRACT:
A linear optical sampling apparatus, temporally samples a modulated optical signal using the amplitude of the interference of its electric field with the electric field of a laser pulse. The apparatus includes a 90° optical hybrid that combines the optical signal and laser pulse in order to generate two quadratures interference samples SAand SB. A processor compensates for optical and electrical signal handling imperfections in the hybrid, balanced detectors, and A/D converters used in the optical sampling apparatus. The processor numerically scales the two quadratures interference samples SAand SBover a large collection of samples by imposing that the average <SA>=<SB>=0 and <SA2>=<SB2> and then minimizes 2<SA·SB>/(<SA2>+<SB2>) =cos(φB−φA)). This is done by adjusting the phase between the two quadratures (ideally either −π/2 or +π/2) so that cos(φB−φA)) is zero. The processor then generates a demodulated sample signal using the quadratures interference samples SAand SB. According to one feature, the hybrid sets the relative phase between two quadratures of their interferometric component so that the phase sensitivity inherent to linear optics is removed. A variety of hybrid arrangements is disclosed that can be implemented using integrated waveguide technology. The apparatus enables sampling of picosecond pulses up to 640 Gb/s with high sensitivity and temporal resolution.
REFERENCES:
patent: 6564160 (2003-05-01), Jungerman et al.
patent: 6654153 (2003-11-01), Kaneko
patent: 6756775 (2004-06-01), Jungerman
C. Dorrer et al, “Linear Optical Sampling,” published in IEEE Photonics Tech. Letters, vol. 15, No. 12, Dec. 2003, pp. 1746-1748.
Doerr Christopher Richard
Dorrer Christophe J.
Winzer Peter J.
Lee John D.
Lucent Technologies - Inc.
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