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N－6 Extremely Flexible 400Gbps-class Adaptive Modulation / Demodulation Technology

Leading-edge Technology for 100/400 Gbps-class Ultra-high Speed Network

This work is partly supported by R&D programs for “High-speed Optical Transport System Technologies,” “High-speed Optical Edge Node Technologies,” and “Ultra-high Speed and Green Photonic Networks” by the Ministry of Internal Affairs and Communications (MIC) of Japan and by the “Universal Link Project” and “R&D of optical transparent transmission technology (Lambda Reach)” of the National Institute of Information and Communications Technology (NICT) of Japan.

Features

Application Scenarios ■ 100 Gbps photonic transport system ■ Next-generation 400 Gbps photonic transport system

■ [Network] Realization of 100/400-Gbps-class ultra-high-speed optical networks employing adaptive multi-level modulation and demodulation technology for optical polarization, amplitude, and phase using high-speed OSNR and chromatic dispersion estimation techniques

■ [Device] ① DSP LSI that operates at low power (20W; 1/4 power reduction) with fast OSNR/chromatic dispersion estimation function. ② InP MZ modulator, with multi-level modulation function that is the key to ultra-high-speed transmission, achieves small size (1/10 conventional size) and low driving voltage (conventionally < 3.5V) of the transceiver module. ③ Compact (1/3 conventional size) wavelength selective switch (WSS) that provides the switching function in the transmission node (ROADM) and realizes equipment suitable for metro-area applications.

Creating the future with value partners To realize high-speed, highly reliable, low-cost service network, we are working on developing state-of the-art optical network technology utilizing open innovation framework in cooperation with domestic equipment vendors.

〈Contact〉scl-forum@lab.ntt.co.jp

R&D is underway on ultra-high-speed digital coherent transmission and optical/electrical device technologies to develop a long-haul large-capacity optical transport network. We have demonstrated real-time 100Gbps transmission with plug & play functionality. We are also researching 400Gbps-class transmission using multi-level modulation/demodulation technique.

Optical amplifier Optical fiber

λn

λ1

RO

ADM

RO

ADM

RO

ADM

CFP4 Receiver module

λn

λ1

CFP4 Transceiver

module

100GbE

100GbE

１００ギガ超級デジタルコヒーレント伝送技術の位置付け

OTN framer

OTN framer

OTN framer

OTN framer

Advancement in optical technologies

100 M

1 G

10 G

100 G

1T

10 T

100 T

1980 1990 2000 2010 2020

Electrical TDM

WDM & Optical

Amplification

1 P

Year of commercialization

Syst

em c

apac

ity (b

ps) Digital Coherent

Transport & DWDM

8Tb/s/fiber

100-400 Gb/s/ch

Long-haul large-capacity optical transport network

100G/400G Adaptive multi-level

mod/demodulation technology

BPSK

QPSK

8QAM

16QAM Select modulation format appropriate for the quality of

the link

Optical transmission node (ROADM)

Wavelength path

• Digital coherent signal processing LSI • 20W (1/4 power reduction) • Spectral compression, nonlinear

optical effects compensation

① Low-power DSP ② InP MZM • Key device for multilevel modulation • Small size 10mm×25mm (1/10 conventional size) • Low driving voltage < 2.5V (conventionally < 3.5V)

③ WSS module • Device for wavelength path

switching • Less than 1/3 conventional size

(suitable for metro-area applications)

Large capacity and highly reliable NWs

NWs with co-created services