Critical Communications

NeoPhotonics Suite Supports 400G Networks

29 September 2015

NeoPhotonics Corporation has unveiled a suite of products and capabilities in support of 400G optical transport. Targeting various multiple network segments, including long haul, metro and data center interconnects, the products include high-speed indium phosphide-based waveguide photodetectors for coherent receivers, ultra-narrow line width lasers for 16QAM and 64QAM, dual-output lasers and small form factor coherent components for high-density line cards and pluggable coherent optics.

Increased transport bandwidth is the common denominator among all of the new 400G products and technology advances. NeoPhotonics’ indium phosphide-based photo-detectors are incorporated in monolithic and hybrid integrated coherent receivers. They are capable of symbol rates of 64 Gbaud, 2x the standard 32 Gbaud in the current 100G systems.

Long-haul applications require higher baud rate transmission, as this segment can use higher data rates without compromising system reach. The integrated coherent receivers, configured in compact small form factor packages, support 400G when coupled with NeoPhotonics dual micro-ITLA, which according to the company, provides two independent, ultra-narrow linewidth, separately tunable lasers. These lasers are said to be 25% smaller than separate micro-ITLAs and suitable for dense linecards with either 400G or multiple 100G ports.

A higher order of modulation also supports higher bandwidth. The 16QAM feature doubles the number of bits transported and quadruples the data rate in metro and data center applications. These modulation schemes are sensitive to amplitude and phase noise and require stable, ultra-narrow linewidth laser sources. External cavity lasers feature the narrowest linewidth and the NeoPhotonics micro-ITLA has typical linewidths of 20 kHz for high fidelity in higher order modulation.

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