Flexible RF-Based Comb Generator

A comb generator based on feeding a single dual drive Mach-Zehnder modulator with a sinusoidal radio frequency (RF) at one arm and its double frequency at the other arm is demonstrated. Our comb generator benefits from the superposition of optical subcarriers generated by the fundamental and its second harmonic. We demonstrate flexibility in center wavelength tunability, subcarrier spacing, and subcarrier count. For a fundamental frequency at, e.g., 6.25 GHz, our comb generator can produce 9, 5, 4, or 3 optical subcarriers with a spectral flatness of <; 1.2 dB. We successfully demonstrate to the best of our knowledge, the generation of the largest number of comblines requiring the lowest drive signal with the least components within the field of RF-generated combs.

[1]  Tetsuya Kawanishi,et al.  Widely wavelength-tunable ultra-flat frequency comb generation using conventional dual-drive Mach-Zehnder modulator , 2007 .

[2]  Zhensen Gao,et al.  Versatile waveform generation using single-stage dual-drive Mach-Zehnder modulator , 2011 .

[3]  Minyu Yao,et al.  Improvement of flatness of optical frequency comb based on nonlinear effect of intensity modulator. , 2011, Optics letters.

[4]  T. Sakamoto,et al.  Asymptotic formalism for ultraflat optical frequency comb generation using a Mach-Zehnder modulator. , 2007, Optics letters.

[5]  Francesca Parmigiani,et al.  26 Tbit s-1 line-rate super-channel transmission utilizing all-optical fast Fourier transform processing , 2011 .

[6]  H. Takara,et al.  Bit-rate-flexible all-optical OFDM transceiver using variable multi-carrier source and DQPSK/DPSK mixed multiplexing , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

[7]  B.-E. Olsson,et al.  Microwave harmonic frequency generation utilizing the properties of an optical phase Modulator , 2004, Journal of Lightwave Technology.

[8]  J. O'Reilly,et al.  Optical generation of very narrow linewidth millimetre wave signals , 1992 .

[9]  Sylwester Latkowski,et al.  40nm wavelength tunable gain-switched optical comb source , 2011, 2011 37th European Conference and Exhibition on Optical Communication.

[10]  Toshio Morioka,et al.  More than 1000 channel optical frequency chain generation from single supercontinuum source with 12.5 GHz channel spacing , 2000 .

[11]  Rui Wu,et al.  Generation of very flat optical frequency combs from continuous-wave lasers using cascaded intensity and phase modulators driven by tailored radio frequency waveforms. , 2010, Optics letters.

[12]  David Hillerkuss,et al.  Silicon-organic hybrid (SOH) modulator generating up to 84 Gbit/s BPSK and M-ASK signals , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[13]  Qi-Jin Chen,et al.  Spectrum analysis of phase amplitude modulation , 1990 .

[14]  W. Shieh,et al.  1-Tb/s Single-Channel Coherent Optical OFDM Transmission With Orthogonal-Band Multiplexing and Subwavelength Bandwidth Access , 2010, Journal of Lightwave Technology.

[15]  A. Ellis,et al.  Spectral density enhancement using coherent WDM , 2005, IEEE Photonics Technology Letters.

[16]  S. Gee,et al.  Ultraflat Optical Comb Generation by Phase-Only Modulation of Continuous-Wave Light , 2008, IEEE Photonics Technology Letters.

[17]  T. Suzuki,et al.  Whole C-band, repetition rate tunable optical pulse generation using a high-resolution arrayed-waveguide grating and an optical comb generator , 2005, OFC/NFOEC Technical Digest. Optical Fiber Communication Conference, 2005..

[18]  1 THz-bandwidth optical comb generation using Mach-Zehnder-modulator-based flat comb generator with optical feedback loop , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[19]  Andrew M. Weiner,et al.  High-rate femtosecond pulse generation via line-by-line processing of phase-modulated cw laser frequency comb , 2006 .