First 140 GBaud optical subassembly for 800G links

First 140 GBaud optical subassembly for 800G links

New Products |
By Nick Flaherty

Coherent is launching the first 140 GBaud integrated coherent transmitter-receiver optical subassembly (IC-TROSA) for 800G QSFP-DD and OSFP digital coherent optics (DCO) pluggable transceivers

The 140 GBaud IC-TROSA from Coherent is the first to enable 800G ZR/OpenZR+ transmission in datacentre interconnects and metro communications networks in the ultra-dense QSFP-DD and OSFP pluggable form factors.

It was combined with the Orion digital signal processor (DSP) from Marvell to successfully demonstrate the performance capabilities of a complete transceiver for 800G links and will be shown at the ECOC conference in Glasgow next week.

Artificial intelligence and machine learning (AI/ML) applications are accelerating the exponential growth of datacentre traffic in cloud networks, driving the demand for efficient bandwidth upgrades in datacentre interconnects and optical transport networks.

The IC-TROSA is a highly integrated coherent optics subassembly with embedded optical amplification that can deliver high transmitter output power with low power dissipation, enabling DCO modules that can plug directly into routers. This approach lowers the total cost of network ownership for hyperscalers and service providers by eliminating an entire layer of transponder equipment.

The 140 GBaud IC-TROSA is a complete coherent optical engine that includes a wavelength-tunable laser, optical amplifiers, modulators, drivers, a coherent mixer, a photodiode array, and transimpedance amplifiers.

It features an embedded microcontroller, DAC/ADCs, and a simple digital communication interface for all control and monitoring at 800G speeds. The module supports symbol rates of up to 140 GBaud and multiple modulation formats, including QPSK, 8QAM, 16QAM, 32QAM, and 64QAM. It is designed to meet the requirements of the OIF IC-TROSA Implementation Agreement (Type-2 version).

“This 140 GBaud IC-TROSA follows the 64 GBaud IC-TROSA introduced in March 2020, which was also an industry first,” said Matthias Berger, Vice President, Coherent Technology, at Coherent Corp. “We continue to advance the state of the art of optical transmission in core networks by leveraging the inherent capabilities of our indium phosphide technology platform. Indium phosphide photonic integrated circuits are differentiated by their high output power, which enables disruptive use cases such as IP-over-DWDM in metro networks.”

“Marvell’s close collaboration with Coherent has enabled us to showcase the power of the combination of technologies from two leading companies,” said Samuel Liu, Sr. Director, Product Line Management, Coherent DSP at Marvell. “Together, the 140 GBaud IC-TROSA and the Orion coherent DSP enable pluggable transceivers for 800 Gbit/s with more than 500 km reach, allowing datacentre interconnects to scale network capacity quickly and economically so as to accommodate the surging traffic from AI/ML and other distributed, data-intensive workloads.”

Alpha samples of the 140 GBaud 800G IC-TROSA are available now and the product will be generally available in mid-2024.

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