Modulation of relaxation oscillation frequency of a DFB laser by using direct detection

Relaxation oscillation frequency is produced when a laser is operated in the low laser threshold current region. In this operation region, a semiconductor laser shows a smooth curve, where we can observe uncertainty into defining the onset of laser oscillation. Relaxation oscillations in the laser intensity can be seen as sidebands on both sides of the main laser line. In this context, a communication system by using a relaxation oscillation frequency as an information carrier is proposed in this paper. The experimental setup is based on operation principle of direct detection, where the obtained microwave signal at the output of a fast photodetector is located on C band and it is modulated with an analog NTSC TV signal.

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

[2]  C. McMahon,et al.  High Accuracy Measurement of Relaxation Oscillation Frequency in Heavily Damped Quantum Well Lasers , 2006, 2006 International Conference on Nanoscience and Nanotechnology.

[3]  M. Ibsen,et al.  Relaxation oscillation noise suppression in fibre DFB lasers using a semiconductor optical amplifier , 2004, Conference on Lasers and Electro-Optics, 2004. (CLEO)..

[4]  J. B. Georges,et al.  Optical transmission of narrow-band millimeter-wave signals by resonant modulation of monolithic semiconductor lasers , 1994, IEEE Photonics Technology Letters.

[5]  Stavros Iezekiel,et al.  Microwave Photonics: Devices and Applications , 2009 .

[6]  W. Loh,et al.  Polarization modulation for optical-microwave applications in phased array antennas , 1991, IEEE Photonics Technology Letters.

[7]  David V. Plant,et al.  60 GHz sources using optically driven heterojunction bipolar transistors , 1992 .

[8]  Xiaoping Zheng,et al.  A Radio-Over-Fiber Downstream Link Employing Carrier-Suppressed Modulation Scheme to Regenerate and Transmit Vector Signals , 2007, IEEE Photonics Technology Letters.

[9]  R. Baets,et al.  Analysis of the carrier-induced FM response of DFB lasers: theoretical and experimental case studies , 1989 .

[10]  A. Seeds,et al.  Fast heterodyne optical phase-lock loop using double quantum well laser diodes , 1992 .

[11]  P. M. Lane,et al.  Fibre-supported optical generation and delivery of 60 GHz signals , 1994 .

[12]  H. Taylor,et al.  35 GHz microwave signal generation with an injection-locked laser diode , 1985 .

[13]  A.J. Seeds.  Broadband wireless access using millimetre-wave over fibre systems , 1997, 1997 IEEE MTT-S International Microwave Symposium Digest.

[14]  A. Nirmalathas,et al.  Fibre-radio: challenges and possible solutions , 2003, MWP 2003 Proceedings. International Topical Meeting on Microwave Photonics, 2003..

[15]  Dennis Derickson,et al.  Fiber optic test and measurement , 1998 .

[16]  C. R. Lima,et al.  Compact optical millimetre-wave source using a dual-mode semiconductor laser , 1995 .

[17]  Ke Wu,et al.  A novel millimeter-wave-band radio-over-fiber system with dense wavelength-division multiplexing bus architecture , 2006, IEEE Transactions on Microwave Theory and Techniques.

[18]  D. Lenstra,et al.  Interacting Frequency and Relaxation Oscillations in a Semiconductor Laser with Filtered Optical Feedback , 2006, 2006 European Conference on Optical Communications.

[19]  K. Petermann.  Laser Diode Modulation and Noise , 1988 .