Journal article
2.5 Gb/s laser-driver GaAS IC
A laser-diode driver GaAs IC incorporating an optional NRZ/RZ (non-return-to-zero/return-to-zero) conversion facility, having ECL (emitter-coupled logic) and SCFL (source-coupled FET logic)-compatible inputs and providing a 0-60-mA adjustable output current into a 50-Ω/5-V termination at bit rates up to 2 Gb/s NRZ and maintaining a clear eye opening of 50 mA at 2.5 Gb/s NRZ bit rate has been designed, using a commercial 1-μm gate-length (Fτ=12 GHz) GaAs MESFET foundry service.
The high maximum output current is obtained by implementing the output driver as a cascode differential amplifier. The logic circuitry implemented using a novel, DCAL (diode-clamped active-load) SCFL family, which is based on gate-width scaling rather than on absolute values, so that the on-chip logic voltage swing is less sensitive to process variations than conventional SCFL.
A 60% improvement in noise margin is also obtained. To verify laser driving performance a back-to-back optical-fiber transmission experiment was performed, giving good optical eye diagrams at 2.5 Gb/s. The electrooptical interplay between laser-diode driver and laser-diode has been demonstrated using SPICE simulations
Language: | English |
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Publisher: | IEEE |
Year: | 1993 |
Pages: | 1139-1146 |
ISSN: | 15582213 and 07338724 |
Types: | Journal article |
DOI: | 10.1109/50.238073 |
0 to 60 mA 2.5 Gbit/s Bit rate FET integrated circuits GaAs MESFET foundry service Gallium arsenide III-V semiconductors Laser noise Lasers and electrooptics Logic circuits MESFET integrated circuits Optical noise Optical sensors Optical signal processing SPICE simulations adjustable output current back-to-back optical-fiber transmission experiment cascode differential amplifier clear eye opening diode-clamped active-load driver circuits electrooptical interplay emitter-coupled logic field effect integrated circuits gallium arsenide gate-length gate-width scaling integrated optoelectronics laser driver GaAs integrated circuit laser driving performance logic circuitry maximum output current noise margin nonreturn to zero/return to zero conversion facility on-chip logic voltage swing optical communication equipment optical eye diagrams power integrated circuits semiconductor lasers source coupled field effect transistor logic compatible inputs termination