Abstract

To expand the span of the optical frequency comb (OFC), we generated the second harmonics of an OFC at 1.55 μm, using a multiperiod periodically poled lithium niobate (PPLN) crystal. A coupled-cavity OFC generator with an average output power of 0.2  mW was amplified and expanded with a fiber amplifier and a dispersion-flattened fiber. The fundamental OFC average power and span were 100  mW and 45  THz, respectively. The second-harmonic comb's span was 3.2  THz; however, we tuned the center frequency over 30  THz by changing the poling period. We also demonstrated that the second-harmonic comb can be used for frequency-difference measurement.

© 1999 Optical Society of America

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