We theoretically prove that a conventional Mach–Zehnder modulator can generate an optical frequency comb with excellent spectral flatness. The modulator is asymmetrically dual driven by large amplitude sinusoidal signals with different amplitudes. The driving condition to obtain spectral flatness is analytically derived and optimized, yielding a simple formula. This formula also predicts the conversion efficiency and bandwidth of the generated frequency comb.
© 2007 Optical Society of America
Original Manuscript: December 8, 2006
Revised Manuscript: March 19, 2007
Manuscript Accepted: March 26, 2007
Published: May 8, 2007
Takahide Sakamoto, Tetsuya Kawanishi, and Masayuki Izutsu, "Asymptotic formalism for ultraflat optical frequency comb generation using a Mach-Zehnder modulator," Opt. Lett. 32, 1515-1517 (2007)