1 February 1992 1.25-Gb/s LED-based optical transmitter
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Abstract
An optical transmitter is described which uses a commercial LED coupled to an external modulator to achieve a 1.25 Gb/s data rate. Both a Mach-Zehnder modulator and a reverse ?? directional coupler were evaluated for modulation of the optical signal. Analytical expressions are derived for the extinction ratio in each device as a function of spectral width of the source. Experimentally, both devices produced an extinction ratio > 20 dB with peak output powers of —20.1 and —23.9 dBm respectively. We estimate that by minimising losses in the system, peak output powers of —12.5 and —15.1 dBm respectively can be achieved with the two devices using the available LED. We also discuss design improvements which can reduce the wavelength sensitivity of the ?? switch and describe a drive circuit capable of extending the upper frequency limit of the current switch from 200 to 1250 MHz.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Warren A. Rosen, Warren A. Rosen, Warren N. Herman, Warren N. Herman, Afshin S. Daryoush, Afshin S. Daryoush, T. Daniel, T. Daniel, } "1.25-Gb/s LED-based optical transmitter", Proc. SPIE 1580, Fiber Optic Components and Reliability, (1 February 1992); doi: 10.1117/12.135389; https://doi.org/10.1117/12.135389
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