Optical modulator and controlling method and apparatus thereof

Details Optical modulator and controlling method and apparatus thereof Optical modulator and controlling method and apparatus thereof

2011-03-15

2011-03-15

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S239000, C359S289000

Reexamination Certificate

active

07907324

ABSTRACT:
The optical modulator branches an input light into (2×N) lights in an optical branching section, and then phase modulates each of the branched lights in (2×N) phase modulating sections, and couples the phase modulated lights in an optical coupling section and generates a quadrature amplitude modulated (QAM) signal light having a 4Nvalue. At this time, a relative difference of optical phases of the phase modulated lights is variably adjusted by an optical phase adjusting section. Moreover, a power ratio of the phase modulated lights is variably adjusted with an optical power adjusting section. As a result, it is possible to output 4NQAM signal light, with good signal quality.

REFERENCES:
patent: 2008/0239448 (2008-10-01), Tanaka et al.
patent: 2010/0202785 (2010-08-01), Kawanishi et al.
patent: 03/049333 (2003-06-01), None
Seimetz M. et al. “Optical Systems With High-Order DPSK and Star QAM Modulation Based on Interferometric Direct Detection”, Journal of Lightwave Technology, IEEE Service Center, New York, NY, US., vol. 25, No. 6, Jun. 2007, pp. 1515-1530.
European Search Report mailed Jul. 2, 2009 and issued in corresponding European Patent Application 08020473.8.
T. Sakamoto, A. Chiba and T. Kawanishi, “50 Gb/s 16 QAM by a quad-parallel Mach-Zehnder modulator”, ECOC 2007, PD2.8 (2 pages).

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