KEYWORDS: Signal detection, Homodyne detection, Semiconductor lasers, Chaos, Frequency shift keying, Fermium, Frequency modulation, Laser processing, Analog electronics, Modulation
The present study is devoted to a theoretical investigation of coherent light signal homodyne detection with an injection-locked laser. In this detection method the external modulated light is injected into the cavity of the laser generating a single mode. The frequencies of the light signal and the laser should be near to each other. Information signal is detected in the bias circuit. We show the appearance of an additional noise due to the chaos excitation if the injected intensity is higher than -30 dBm. The fractal dimensions of the corresponding strange attractors are calculated. The effect of analog FM signals distortion is found. The reason is dependence of phase difference between external and laser radiations on frequency detuning.
The method of parallel information transmission through an optical communication line by single semiconductor laser, coupled to an external multi mirror cavity, is proposed. The method is based upon the theoretically predicted possibility of each mode independent excitation within the laser coupled to external multi mirror cavity multi mode spectrum. The experiment was accomplished on arbitrary two-digit binary sequence transmission. The output signal and noise properties of the transmitter were investigated in both channels simultaneously. It was shown that mode hopping of the transmitter is the main source of noise in the transmission line. The possibility of mode hopping noise reduction by low bias current harmonic modulation was demonstrated.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.