A laser diode module for optical communication is disclosed and includes a plurality of leads, a housing having a vertical wall, a heat sink disposed on the housing, a superlattice microcooler disposed on the heat sink, a laser diode disposed on one side of the superlattice microcooler, a ...
We describe the frequency locking of the second-harmonic signal of a 197.2-THz (1520.25-nm) distributed-feedback diode laser to the absorption lines of the iodine hyperfine structure; a frequency jitter below 0.1 MHz was achieved at a 300-ms time constant. This scheme provides a simple, ...
The light emitting diode of chapter 2 can be modulated to act as the source in an optical communication system. The primary disadvantage of using an LED in such a system is that it emits light over a relatively wide range of wavelengths — the relative width of an LED’s emission is typi...
Semiconductor laser device for optical communication A backward laser beam radiated from a laser diode is received in a photo diode, and an intensity of a forward laser beam radiated from the laser diode is adjusted according to the intensity of the received backward laser beam. The forwar......
A 50 Mbps direct detection optical communication system for use in an intersatellite link was constructed with an AlGaAs laser diode transmitter and a silicon avalanche photodiode photodetector. The system used a Q = 4 PPM format. The receiver consisted of a maximum likelihood PPM detector and a...
The laser diode module (1) has a laser diode transmitter (2) and a monomode optical fibre (3). The laser diode transmits to an optical system (4) enlarging the near field image. Light is collected by an optical fibre with varying gradient index and having an elliptical centre (5) and...
A 50 Mbps direct detection optical communication system for use in an intersatellite link was constructed with an AlGaAs laser diode transmitter and a silicon avalanche photodiode photodetector. The system used a Q = 4 PPM format. The receiver consisted of a maximum likelihood PPM detector and a...
Keywords: semiconductor laser, optical communication, quantum well 1. Introduction The performance, functionality and productivity of the semiconductor laser have been dramatically improved since its invention in 1962. Today it came to be indispen- sable for our life as optical components connecting ...
Violet laser diode (VLD) based ultrahigh-speed free-space optical (FSO) system is demonstrated for point-to-point data transmission. By directly encoding the VLD with 64-quadrature amplitude modulation discrete multi-tone (64-QAM DMT) data stream for optical wireless communication through 0.5–10...
Widely tunable sampled-grating distributed feedback laser diode The SG-DFB laser diode of the present invention has a high output optical efficiency in comparison with a conventional wavelength tunable laser provided with Bragg reflection ends at the both ends of the gain region for the wavelength ...