We report on the design and performance of a silicon photonic micro-transceiver required to operate in high ambient temperature environments above 105°C. The four channel “I/O core” micro-transceiver incorporates a 1310 nm Quantum Dot laser system and operates at a data-rate of 32 Gbps per lane. The 5mm x 5mm micro-transceiver chip benefits from a multimode coupling interface for low-cost assembly and robust connectivity at high temperatures and an optical redundancy circuit, increasing reliability by over an order of magnitude. I/O core is a photonic building block used to construct more complex application-customized modules such as 512 Gb/s modules for HPC, 5G and AI systems.
An evanescently coupled waveguide photodiode (EC-WG-PD) for both 1310-nm and 1550-nm wavelength bands has been developed for use in long-haul and high capacity very-short-reach (VSR) transmission systems. The EC-WG-PD is much more robust than a conventional waveguide photodiode (WG-PD) under high optical input operation because its absorbed optical power density is distributed along the light propagation in the waveguide. High external quantum efficiency of 65% for 1310 nm and 74% for 1550 nm, and a high 3-dB-down bandwidth of 41 GHz were demonstrated. No significant degradation of the frequency response was observed up to an average photocurrent of 10 mA. Moreover, a clear receiving eye-waveform was obtained at 40 Gb/s for an implemented single-output receiver module.
This paper clarifies superior external optical feedback resistant characteristics in partially-corrugated-waveguide laser diodes (PC-LDs), compared to conventional distributed feedback laser diodes (DFB-LDs). Based on a novel large single dynamic analysis by using the van der Pol equations in single-mode laser diodes (LDs), it is found that the external optical feedback resistance in single-mode LDs is dominated by the transient fluctuation of mirror loss (total net threshold gain), and depends on the grating phases at the cleaved facets. Theoretical results predict that in the PC-LDs, mirror loss is insensitive to the grating facet phases due to a unique waveguide, which consists of a corrugated waveguide near the antireflection-coated front facet and an uncorrugated waveguide near the high- reflection-coated rear facet. Therefore the variation of phase conditions for oscillation caused by the external optical feedback gives rise to a relative low transient fluctuation of the mirror loss that suppresses the positive feedback effect of mirror loss, as well as the optical output fluctuations. Furthermore, optimum-grating length, i.e. 150 micrometers for 250 micrometers cavity length, was derived by the calculations. The relative intensity noise (RIN) caused by external optical feedback was measured for PC-LDs with different grating length over a wide feedback level range from -40 dB to -20 dB. Experimental results show that, for the cavity length of 250 micrometers , the PC-LDs with a grating length of 150 micrometers have the most excellent external optical feedback resistant characteristics. The increase of RIN was suppressed to as low as -126 dB/Hz with the external optical feedback of -20 dB. These results agreed well with the theoretical analysis.
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