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A set of high-speed integrated circuits (ICs) has been introduced for 10 gigabit-per-second (Gbit/s) synchronous optical networking (SONET) and synchronous digital hierarchy (SDH) optical networking systems. The ICs include a clock synthesizer/data multiplexer (TTRN0110G), clock recovery/data demultiplexer (TRCV0110G), laser driver (TLAD0110G), modulator driver (TMOD011G), limiting amplifier (TLMA0110G) and transimpedance amplifier(TTIA0110G). Using silicon germanium (SiGe) and gallium arsenide(GaAs) technologies, they offer a comprehensive OC-192 (STM-64)solution for such optical networking applications as digital cross connects, add-drop multiplexers (ADMs), switches, routers, repeaters and access equipment.

The TTRN0110G multiplexes 16 parallel 622.08 megabit-per-second (Mbit/s) data lines and generates a 10 Gbit/s clock and data output. The multiplexer features a clockless data transfer and contra-clocking may be used. The TRCV0110G integrates the clock and data recovery with a 1-to-16 data demultiplexer. Both devices use low-voltage differential swing (LVDS) data interfaces and operate at the SONET/SDH OC-192 rate of 9.9532 Gbit/s, the forward error correction rate (FEC) of 10.6642 Gbit/s, and the serial 10 Gbit/s-Ethernet rate of 10.3125 Gbit/s. The combined power dissipation is 3.0 to 3.7 watts.

The laser driver and the modulator driver are current and voltage drivers used to drive lasers and modulators in 10 Gbit/s optical transmission systems. They contain four cascaded stages and accept ECL level inputs. The TMOD0110G is available in two versions (-5.2 and -6.8-volt power supply), is capable of driving Lithium Niobate modulators and contains an output buffer.

The limiting amplifier provides 33 dB of gain and eight gigahertz (GHz) of bandwidth and has a typical single-ended input sensitivity of seven milli-volts peak-to-peak. The transimpedance amplifier is a hybrid IC that combines a transimpedance amplifier die with the necessary filtering to achieve a dynamic range amplifier. A typical application is a low-noise, high-speed optical receiver when combined with an Avalanche Photo Detector (APD) or positive intrinsic negative (PIN) photodetector.

Lucent Technologies, 600 Mountain Avenue, Murray Hill, NJ 07974. Tel: 888-458-2368; Fax: 908-508-2576.

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