The design and fabrication of OEICs on semi-insulating InP substrates comprising 1300nm DFB lasers, 1300/1530 nm wavelength duplexers and monitor photodiodes is described. OEIC lasing thresholds were as low as 20mA. The throughstate crosstalk for the integrated duplexer was typically — 12dB. Linear tracking of the laser output by the monitor photodiode was achieved with sensitivities in the region of 70μA/mW. The OEICs operated successfully in a 622Mbit/s bidirectional optical link.
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Charles et al. (1992) studied this question.