Yokogawa periodically publishes the Yokogawa Technical Report, which contains articles that take a detailed look at the technologies employed in Yokogawa's products. At this site you will find links to all of the reports that have been published since 1997 as well as links to PDF files containing the full text of selected articles from each issue.
- MIURA Akira*1
*1Photonics Business Headquarters, Vice president
This paper outlines Yokogawa’s activities in the field of optical communications, which are one of the most important social infrastructures in the 21st century. It examines how Yokogawa provides total solutions ranging from modules to subsystems and measuring instruments, and reviews the future direction of optical communication technologies and Yokogawa’s prospects.
- OHTA Atsunobu*1
- TANIMURA Daisuke*1
- KYAKUNO Tomohiko*1
- IIO Shinji*2
*1Photonics Business Headquarters, Engineering Center
*2Photonics Business Headquarters, Engineering Department I
We have successfully developed a high performance transponder subsystem first in the world by using 43-Gbps RZ-DQPSK (Return to Zero Differential Quadrature Phase Shift Keying) modulation formats. We have already manufactured, inspected and shipped over three hundred transponder subsystems as a commercial product of optical transmission system to a domestic major telecommunication career. Our transponder is applicable to high capacity optical networks which are recommended by international standard OTN (Optical Transport Network) and the combination of our transponder and OTN-framer including Forward Error Correction (FEC) realizes a DWDM (Dense Wavelength Division Multiplexing) optical transmission system which operates over 43-Gbps per wavelength channel. This paper reports features, configuration and performance of 43-Gbps RZ-DQPSK Transponder subsystem.
- TANIMURA Kazunori*1
- MAEDA Minoru*1
- AKAHORI Hiroshi*1
- OHTA Hiroshi*1
*1Communication and Measurement Business Headquarters, Core Technology Development Department, Application Gr.
We have developed a new measurement instrument, NX7000, for evaluating and monitoring the signal quality of phase-modulated optical signals in the nextgeneration 40-Gbps optical communication networks. Measurement of the differential constellation/phasor diagrams and demodulated signals of 40-Gbps differential phase-shift keying (DPSK) and differential quadrature phase-shift keying (DQPSK) signals using the NX7000 enables quantitative analysis and evaluation of the signals. The instrument will help users to develop and improve their products for 40-Gbps transmission systems. The NX7000 is based on our original technology in which we use 1-bit delayed self-homodyne detection and high time-resolution signal sampling in order to analyze DPSK/DQPSK signals directly. This paper outlines the basis and features of the NX7000.
- DAIRI Kenji*1
- SHIDA Hideo*1
- TSUTSUMI Seiichi*1
- TAKAHASHI Kenji*1
*1Communications and Measurement Business Headquarters, Optical Communication Measurement Development Department
The 40-Gbit/s transport networks that will meet the communication demand of Next-Generation Networks (NGN) are starting to be deployed commercially. To meet the increasing measurement needs of the 40-Gbit/s networks and transmission equipment, we have developed the NX4000 Transport Analyzer. This can accurately and efficiently measure the transmission quality and characteristics of the networks, transmission equipment corresponding to 40-Gbit/s Synchronous Digital Hierarchy (SDH), Synchronous Optical NETwork (SONET), and Optical Transport Network (OTN). This paper describes the various measurement applications of the NX4000 Transport Analyzer.
- UMEZAWA Toshimasa*1
- KUDOU Takahiro*1
- HIHARA Mamoru*2
- WADA Morio*2
*1Photonics Business Headquarters, Engineering Department I
*2Photonics Business Headquarters, Engineering Department IV
We have developed 40-Gbps dual PIN photodiode modules for Differential Phase Shift Keying (DPSK) or Differential Quadrature Phase Shift Keying (DQPSK) telecommunication systems using proprietary compound semiconductor devices. The modules are composed of a surface illuminated dual PIN device, unifying a post amplifier with a twin pigtail fiber. The modules offer high responsivity of 40 Gbps, good frequency response, high common mode reduction ratio, and low bit error rate. This dual PIN photodiode is used in Yokogawa’s RZDQPSK transponder (PNTR404), the world’s first to enable 40-Gbps long-haul transmission.
- SUGAWARA Hiroshi*1
- IZAWA Toshiyasu*1
- IWABUCHI Naoki*1
- ITO Naoki*1
*1Photonics Business Headquarters, Engineering Department II
We have developed a high-speed burst mode clock recovery (Burst CR) IC operating on a lock-in time of 50 ps, i.e. a half bit of 10-Gbps data, and have developed an optical packet transceiver which incorporates the Burst CR. These are based on indispensable technologies for accurate communications and stable operations in next-generation optical networks such as optical packet networks and 10G-PON (Passive Optical Network), and will greatly contribute to earlier implementation of such optical networks.
- SUEHIRO Masayuki*1
- NAKAJIMA Shinichi*1
- ASANO Yoshiyuki*2
- ISHII Takayuki*1
*1Photonics Business Headquarters, Engineering Department IV
*2Photonics Business Headquarters, Engineering Department I
We have developed a new type of ultra-high-speed optical line exchange equipment called the optical router core subsystem, which incorporates ultra-highspeed optical switching devices. This equipment offers ultra-high-speed bidirectional line exchange, enabling independent operation of optical modulation formats and bit rates. We have successfully demonstrated operation of this equipment in 43-Gbps DQPSK (Differential Quadrature Phase-Shift Keying), DPSK (Differential Phase-Shift Keying), and 160-Gbps RZ (Return to Zero) modulation formats without signal deterioration. This optical router core subsystem is expected to be applied to high-speed line switching in GMPLS (Generalized Multi-Protocol Label Switching), burst switches in optical networks, and interconnections of supercomputer nodes networks.