In:
Optica, Optica Publishing Group, Vol. 7, No. 7 ( 2020-07-20), p. 775-
Abstract:
Photodetectors are cornerstone components in integrated optical
circuits and are essential for applications underlying modern science and engineering. Structures harnessing conventional crystalline
materials are typically at the heart of such devices. In particular, group-IV semiconductors such as silicon and germanium open up more
possibilities for high-performing on-chip photodetection thanks to their favorable electrical and optical properties at near-infrared
wavelengths and processing compatibility with modern chip manufacturing. However, scaling the performance of silicon-germanium
photodetectors to technologically relevant levels and benefiting from improved speed, reduced driving bias, enhanced sensitivity, and
lowered power consumption arguably remains key for densely integrated photonic links in mainstream shortwave infrared optical
communications. Here we report on a reliable 40 Gbps direct detection of chip-integrated silicon-germanium avalanche p-i-n photo receiver
driven with low-bias supplies at 1.55 µm wavelength. The avalanche photodetection scheme calls upon fabrication steps commonly used in
complementary metal-oxide-semiconductor foundries, alleviating the need for complex epitaxial wafer structures and/or multiple ion
implantation schemes. The photo receiver exhibits an internal multiplication gain of 120, a high gain-bandwidth product up to
210 GHz, and a low effective ionization coefficient of ∼ 0.25 . Robust and stable photodetection at
40 Gbps of on–off keying modulation is achieved at low optical input powers, without any need for receiver electronic stages.
Simultaneously, compact avalanche p-i-n photodetectors with submicrometric heterostructures promote error-free operation at
transmission bit rates of 32 Gbps and 40 Gbps, with power sensitivities of − 12.8 d B m and − 11.2 d B m , respectively (for 10 − 9 error rate and without error
correction coding during use). Such a performance in an on-chip avalanche photodetector is a significant step toward large-scale
integrated optoelectronic systems. These achievements are promising for use in data center networks, optical interconnects, or quantum
information technologies.
Type of Medium:
Online Resource
ISSN:
2334-2536
DOI:
10.1364/OPTICA.393537
Language:
English
Publisher:
Optica Publishing Group
Publication Date:
2020
detail.hit.zdb_id:
2779175-0
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