Microwave Photonic Link with Carrier Suppression for Increased Dynamic Range

Theoretical analysis and experimental investigation of microwave photonic links with bias-shifted Mach-Zehnder modulators are presented. An optical amplifier is used to increase link gain and reduce noise figure. The combination of modulator bias shift away from quadrature and optical amplification reduces the link noise figure by more than 15 dB. For modulation frequencies from 2 to 18 GHz, the third-order limited spurious-free dynamic range (SFDR3) of these links is greater than 120 dB, normalized to a 1-Hz bandwidth. Conventional links based on Mach-Zehnder modulators are limited to SFDR3 values of approximately 110 dB, normalized to a 1-Hz bandwidth. This level of performance is achieved without electronic or optical linearization.

[1]  N. Olsson,et al.  Erbium-Doped Fiber Amplifiers: Fundamentals and Technology , 1999 .

[2]  E. Desurvire.  Erbium-doped fiber amplifiers , 1994 .

[3]  G. Betts,et al.  Direct-detection analog optical links , 1997 .

[4]  Suwat Thaniyavarn,et al.  Optical carrier filtering for high dynamic range fibre optic links , 1994 .

[5]  W.K. Burns,et al.  Multi-octave operation of low-biased modulators by balanced detection , 1996, IEEE Photonics Technology Letters.

[6]  Charles Howard Cox,et al.  Analog Optical Links: Theory and Practice , 2006 .

[7]  Leonid G. Kazovsky,et al.  Dynamic range of optically amplified RF optical links , 2001 .

[8]  A. Nirmalathas,et al.  Millimeter-wave broad-band fiber-wireless system incorporating baseband data transmission over fiber and remote LO delivery , 2000, Journal of Lightwave Technology.

[9]  N. A. Olsson,et al.  Optical Amplifiers in Fiber Optic Communication Systems — Theory , 1999 .

[10]  W.S.C. Chang,et al.  Increased linear dynamic range by low biasing the Mach-Zehnder modulator , 1993, IEEE Photonics Technology Letters.

[11]  Frederick J. O'Donnell,et al.  Semiconductor laser sources for externally modulated microwave analog links , 1997 .

[12]  Gary E. Betts,et al.  Techniques and Performance of Intensity-Modulation Direct-Detection Analog Optical Links , 1998 .

[13]  K. Williams,et al.  Wideband efficiency improvement of fiber optic systems by carrier subtraction , 1995, IEEE Photonics Technology Letters.

[14]  C. R. Lima,et al.  Optical generation of millimeter-wave signals for fiber-radio systems using a dual-mode DFB semiconductor laser , 1995 .

[15]  Lew Goldberg,et al.  Generation and control of microwave signals by optical techniques , 1992 .