Super wide span optical frequency comb generation by nonlinear self-phase-modulation in an optical fiber

In summary, expansion of the optical frequency comb (OFC) span was realized by applying self-phase modulation, and the resulted span of the OFC was 47THz. The OFC is based on an electro-optical modulator enclosed in a high finesse optical cavity driven by microwaves with a constant frequency, generating more than one thousand equally spaced sidebands on large frequency span as wide as several THz from a cw laser light.