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Integrated Lithium Niobate Mach-Zehnder Interferometers for Advanced Modulation Formats
Tetsuya KAWANISHI Takahide SAKAMOTO Akito CHIBA
IEICE TRANSACTIONS on Electronics
Publication Date: 2009/07/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Recent Advances in Ultra-high-speed Photonic Devices for Next-generation Optical Fiber Communications)
optical modulator, quadrature amplitude modulation, lithium niobate, Mach-Zehnder interferometer,
Full Text: FreePDF(634.1KB)
We present recent progress of high-speed Mach-Zehnder modulator technologies for advanced modulation formats. Multi-level quadrature amplitude modulation signal can be synthesized by using parallel Mach-Zehnder modulators. We can generate complicated multi-level optical signals from binary data streams, where binary modulated signals are vectorially summed in optical circuits. Frequency response of each Mach-Zehnder interferometer is also very important to achieve high-speed signals. We can enhance the bandwidth of the response, with thin substrate. 87 Gbaud modulation was demonstrated with a dual-parallel Mach-Zehnder modulator.