This brief presents a CMOS burst-mode optical transmitter suitable for use in 1.25-Gb/s Ethernet passive optical network applications. Based on feedback from the monitoring photodiode, in order to control consecutive burst data the proposed transmitter in this brief uses a reset mechanism, which allows fast responses from the beginning of a high-speed input burst. The chip is fabricated in mixed-mode 0.18-m CMOS technology and measurements are implemented in a chip-on-board configuration using a pig-tailed type Fabry-Perot laser. Under burst-mode operation of 1.25-Gb/s pseudorandom binary sequences, measurements show about 1-dBm averaged transmitted optical power with an over 12-dB extinction ratio over a wide temperature range.Index Terms-Burst mode, Ethernet passive optical network (E-PON), gigabit Ethernet, laser driver, optical transmitter.
A fully integrated burst-mode upstream transmitter chip for gigabit-class passive optical network applications is implemented in 0.18µm CMOS technology. In order to control consecutive burst data, the transmitter proposed in this paper uses a reset mechanism with TX_enable as a burst envelope signal. The feedback from the monitoring photodiode (MPD) is separated by two independent paths for temperature compensation. The chip tested with chip-on-board configuration shows an average power of 2dBm with extinction ratio of above 12dB under 1.25Gb/s burstmode operation. Based on the measurement, this work complies with the GPON ITU-T Recommendation G.984.2.
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