Abstract
In this article, we first review the current status of 400GBASE client-side optics standards and multi-source agreements (MSAs). We then compare different form factors for 400GE modules, including CFP8, OSFP and QSFP-DD. The essential techniques to implement 400GE, such as pulse amplitude modulation (PAM4), forward error correction (FEC) and a continuous time-domain linear equalizer (CTLE), are discussed. A 400GE physical interface card (PIC) in Juniper’s PTX5000 platform has been developed, conforming to the latest IEEE802.3bs standard. To validate the PIC’s performance, a commercial optical network tester (ONT) and the PIC are optically interconnected through two CFP8-LR8 modules. The CFP8-LR8 module utilizes eight optical wavelengths through coarse wavelength division multiplexing (CWDM). Each wavelength carries 50 Gb/s PAM4 signal. The signal transmits through 10 km of single mode fiber (SMF). The ONT generates framed 400GE signal and sends it to the PIC through the first CFP8 module. The PIC recovers the signal, performs an internal loopback, and sends 400GE signal back to the ONT through the second CFP8 module. The optical spectrum, eye diagram, receiver sensitivity, long time soaking results, and internal digital diagnosis monitoring (DDM) result are fully characterized. The pre-FEC bit error rate (BER) is well below the KP4 FEC threshold of 2.2 × 10−4. After KP4 FEC, error-free performance over 30 km of SMF is achieved. In this way, we demonstrate both the interoperation between the PIC and the ONT, as well as the interoperation between the two CFP8 modules. This demonstration represents the successful implementation of the 400GE interface in the core IP/MPLS router.
Highlights
Processing information and transmitting information are two fundamental functions in communication networks [1]
After KP4 forward error correction (FEC), error-free performance over 30 km of single mode fiber (SMF) is achieved. We demonstrate both the interoperation between the physical interface card (PIC) and the optical network tester (ONT), as well as the interoperation between the two CFP8 modules
Information processing in the communication network is mainly performed by these functional units, which is in the electron domain
Summary
Processing information and transmitting information are two fundamental functions in communication networks [1]. As there is minimal interaction between bosons, photons are ideal for transmitting information in different degrees of freedom including wavelength, time, amplitude, phase, polarization, mode, and space [2,3]. Information processing in the communication network is mainly performed by these functional units, which is in the electron domain. ×x 2 wavelength selective switching (WSS), embedded switch gain optical multiplexer/de-multiplexers, and optical supervisory channelbi-directional for optical management. of 9 into amplifiers, optical multiplexer/de-multiplexers, and optical supervisory channel for optical a single package that supports up to 64 ITU-T C-band wavelengths at 50 GHz spacing via an IPLC management a single package that supports up(WSS), to 64 ITU-T. Series PICs thatgain support spacing via optical an IPLC multiplexer/de-multiplexers, expansion line card. Up to 64 ITU-T C-band wavelengths at 50 GHz management into a15single package that supports spacing via an IPLC expansion line card.
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