Boundless-range optical phase modulator for high-speed frequency-shift and heterodyne applications

Optical phase modulators are used for many applications in optical communication systems and signal processing, but they are fundamentally limited in the amount of a monotonic phase change that can be induced due to practical physical limits on the drive-signal magnitude. In this paper, the necessary drive conditions are derived to achieve a boundless monotonic phase change on the output while keeping the drive inputs within practical physical bounds, i.e., comparable to an amplitude modulator. A simulation of a three-section modulator with two distinct drive signals is provided whereby a continuous phase change on the output is achieved with only a maximum phase shift of /spl pi//2 created in any individual section. The architecture has two outputs, therefore a design tradeoff can be made in choosing the power splitting ratio between the outputs. The amplitudes are kept constant as the phase is modulated. The other output is not frequency shifted and may provide a convenient heterodyne signal for subsequent coherent processing.

[1]  E.L. Wooten,et al.  A review of lithium niobate modulators for fiber-optic communications systems , 2000, IEEE Journal of Selected Topics in Quantum Electronics.

[2]  Rotating-Waveplate Optical-Frequency Shifting in Lithium Niobate , 1971 .

[3]  T. Kobayashi,et al.  10-GHz-order high-efficiency electrooptic frequency shifter using slant-periodic domain inversion , 2004, IEEE Photonics Technology Letters.

[4]  T. Kobayashi,et al.  Numerical Simulation of a lightwave synthesized frequency sweeper incorporating an optical SSB Modulator composed of four optical phase Modulators , 2002 .

[5]  H. Takesue,et al.  Broad-band lightwave synthesized frequency sweeper using synchronous filtering , 2004, Journal of Lightwave Technology.

[6]  M. Cappuzzo,et al.  Reset-free integrated polarization controller using phase shifters , 2004, IEEE Journal of Selected Topics in Quantum Electronics.

[7]  F. Heismann,et al.  Integrated‐optical frequency translator with stripe waveguide , 1984 .

[8]  H. Kogelnik,et al.  PMD fundamentals: polarization mode dispersion in optical fibers. , 2000, Proceedings of the National Academy of Sciences of the United States of America.

[9]  M. Izutsu,et al.  Integrated optical SSB modulator/frequency shifter , 1981 .

[10]  Robert A. Griffin,et al.  Optical differential quadrature phase-shift key (oDQPSK) for high capacity optical transmission , 2002, Optical Fiber Communication Conference and Exhibit.

[11]  Steven K. Korotky,et al.  Dual Parallel Modulation Schemes for Low-Distortion Analog Optical Transmission , 1990, IEEE J. Sel. Areas Commun..

[12]  M. Sugiyama.  Broadband LiNbO/sub 3/ modulators , 2004, 2004 IEEE International Topical Meeting on Microwave Photonics (IEEE Cat. No.04EX859).

[13]  A. C. Lindsay,et al.  A wide-band microwave photonic phase and frequency shifter , 1997 .

[14]  Joerg Heber,et al.  Broadband Modulation of Light by Using an Electro-Optic Polymer , 2002, Science.

[15]  W.S.C. Chang,et al.  Spur-free dynamic range measurements of a fiber optic link with traveling wave linearized directional coupler modulators , 1994, IEEE Photonics Technology Letters.

[16]  G. H. Smith,et al.  TECHNIQUE FOR OPTICAL SSB GENERATION TO OVERCOME DISPERSION PENALTIES IN FIBRE-RADIO SYSTEMS , 1997 .

[17]  Gary E. Beth.  Linearized Modulator for Suboctave-Bandpass Optical Analog Links , 1994 .

[18]  Inuk Kang,et al.  Highly sensitive direct characterization of femtosecond pulses by electro-optic spectral shearing interferometry. , 2003, Optics letters.

[19]  P. Oswald,et al.  Deterministic analysis of endless tuning of polarization controllers , 2006, Journal of Lightwave Technology.

[20]  H. Fetterman,et al.  Demonstration of 110 GHz electro-optic polymer modulators , 1997 .

[21]  J. Stiens,et al.  Cascade acousto-optic frequency shift of light , 2001 .

[22]  D. Willetts,et al.  Chirp-pulse-compression three-dimensional lidar imager with fiber optics. , 2005, Applied optics.

[23]  C. F. Buhrer,et al.  OPTICAL FREQUENCY SHIFTING BY ELECTRO‐OPTIC EFFECT , 1962 .