News: Optoelectronics
7 June 2021
NeoPhotonics announces CFP2-DCO module transmission of 400Gbps over 1500km in 75GHz-spaced EDFA-only DWDM system
NeoPhotonics Corp of San Jose, CA, USA – a vertically integrated designer and manufacturer of silicon photonics and hybrid photonic integrated circuit (PIC)-based lasers, modules and subsystems for high-speed communications – says that it has used its multi-rate CFP2-DCO coherent pluggable transceivers to effectively transmit at a 400Gbps data rate over a distance of 1500km in a 75GHz-spaced DWDM network.
This 1500km transmission demonstration was carried out on NeoPhotonics’ Transmission System Testbed using production modules with enhanced firmware and utilized 75GHz-spaced channels taking the adjacent-channel crosstalk-induced penalty into account. The transmission system contains 19 in-line erbium-doped fiber amplifiers (EDFAs).
To achieve 1500km reach and a 400G data rate, the modules were operated at 69Gbaud using 16 QAM modulation. Probabilistic constellation shaping and a soft-decision forward error correction (FEC) codec were used to achieve a required optical signal-to-noise ratio (OSNR) of about 20dB, which is comparable to coherent line-card port performance from leading chassis-based coherent systems. The modules each consumed considerably less electrical power than line-card solutions operating at comparable data rates and distances, it is reckoned.
The 400G CFP2-DCO coherent pluggable transceiver modules use NeoPhotonics’ high-performance indium phosphide (InP)-based coherent components, along with its ultra-narrow-linewidth tunable laser. These components are all shipping in high volume into multiple coherent system applications, and include:
- Class 40 CDM: NeoPhotonics’ Class 40, polarization-multiplexed, quadrature coherent driver modulator (CDM) features a co-packaged InP modulator with a linear, high-bandwidth differential driver, and is designed for low V-Pi, low insertion loss and a high extinction ratio. The compact package is designed to be compliant with the form factor of the OIF Implementation Agreement #OIF-HB-CDM-01.0.
- Class 40 Micro-ICR: NeoPhotonics’ Class 40 high-bandwidth micro-intradyne coherent receiver (Micro-ICR) is designed for >60GBaud symbol rates. The compact package is designed to be compliant with the OIF Implementation Agreement OIF-DPC-MRX-02.0.
- Nano-ITLA: NeoPhotonics’ Nano-ITLA is based on the same proven and reliable high-performance external-cavity architecture as the firm’s Micro-ITLA and maintains comparable ultra-narrow linewidth, low-frequency phase noise and low power consumption in a compact package approximately half the size.
NeoPhotonics’ multi-rate CFP2-DCO modules are fully qualified. Telcordia testing has been successfully extended to 2000 hours of high-temperature operating life (HTOL) testing, showing the high reliability and performance of NeoPhotonics’ CFP2-DCO platform.
Multi-rate CFP2-DCO modules supporting metro (64Gbaud/DP-16 QAM) and long haul (64Gbaud/DP-QPSK) applications are shipping in general availability.
“Coupled with our recent demonstration of 800km 400Gbps transmission using our 400ZR+ QSFP-DD, our CFP2-DCO 400G 1500km transmission brings the use of pluggable modules in regional and long-haul networks closer to reality,” says chairman & CEO Tim Jenks. “The ability to implement a long-haul coherent transponder in the size and power envelope of a pluggable module is a testament to the progress that has been made in photonic integration and DSP [digital signal processor] development, and has the potential to be a game changer for telecom as well as DCI networks,” he concludes.
NeoPhotonics’ 400ZR+ QSFP-DD transceiver demos 400Gbps transmission over 800km in 75GHz-spaced DWDM
