In this paper we describe a compact optoelectronic circuit for spike-free nanosecond pulse generation in semiconductor lasers. The device is designed to work as an injection seeder in high-power fiber lasers built in master oscillator power amplifier architecture. To reduce a significant pulse distortion resulted from relaxation oscillations, a technique called light injection was used. It allows achieving the pulse generation with excellent temporal and spectral properties. Smooth pulses with duration of 1.9ns and narrowband spectrum with a central wavelength of 1550nm have been presented experimentally.
Fiber-based laser sources delivering optical pulses at a wavelength of ~1.5μm have attracted a great interest in recent years mainly due to their unique properties. High efficiency, high output power, eye-safe wavelength and very good output beam quality make them a perfect tool for Free Space Optics communication. The most suitable modulation scheme for long-haul communication is pulse-position modulation mainly due to its high peak-to-average power ratio. In this paper we discuss a potential use of high power fiber laser system built in Master Oscillator Power Amplifier architecture for pulse-position modulated Deep Space Optical Communication. We focus on power scalability, beam quality, laser driver simplicity and temporal deformation of nanosecond laser pulses as well. In summary we shortly compare features of pulse-position modulated fiber laser transmitter with other high power laser sources being used in optical communication.
The paper describes an injection seeder driver (prototype) for a directly modulated semiconductor laser diode. The
device provides adjustable pulse duration and repetition frequency to shape an output signal. A temperature controller
stabilizes a laser diode spectrum. Additionally, to avoid a back oscillation, redundant power supply holds a generation
until next stages shut down. Low EMI design and ESD protection guarantee stable operation even in a noisy
environment. The controller is connected to the PC via USB and parameters of the pulse are digitally controlled through
a graphical interface. The injection seeder controller can be used with a majority of commercially available laser diodes.
In the experimental setup a telecommunication DFB laser with 4 GHz bandwidth was used. It allows achieving
subnanosecond pulses generated at the repetition rate ranging from 1 kHz to 50 MHz. The developed injection seeder
controller with a proper laser diode can be used in many scientific, industrial and medical applications.
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.