Modulation characteristic and intensity noise of CW superluminescent diodes
Abstract
The low-frequency intensity noise, frequency response to small-signal modulation, and emission linewidth have been measured for CW superluminescent diodes (SLDs) fabricated from standard four-layer double-hetero material. It is shown that as regards the linewidth (below 22 nm) and modulation capability (600 MHz), the SLD occupies a position halfway between the LED and the injection laser. The low-frequency relative excess noise of the photocurrent generated by the radiation of the SLD is less than -125 dB for a bandwidth of 1 Hz. These properties make the SLD an effective light source for optical-fiber systems.
- Publication:
-
Electronics Letters
- Pub Date:
- September 1981
- DOI:
- 10.1049/el:19810502
- Bibcode:
- 1981ElL....17..715S
- Keywords:
-
- Continuous Radiation;
- Light Emitting Diodes;
- Light Modulation;
- Noise Spectra;
- Spectral Line Width;
- Aluminum Gallium Arsenides;
- Gallium Arsenides;
- Heterojunction Devices;
- Light Sources;
- Luminescence;
- Optical Communication;
- Photoelectric Emission;
- Threshold Currents;
- Electronics and Electrical Engineering