Design and performance of an optical path cross-connect system based on wavelength path concept

Author

Koga, Masafumi ; Hamazumi, Yoshiyuki ; Watanabe, Atsushi ; Okamoto, Satoru ; Obara, Hitoshi ; Sato, Ken-Ichi ; Okuno, Masayuki ; Suzuki, Senichi

Author_Institution

NTT Opto-Electron. Labs., Kanagawa, Japan

Volume

14

Issue

6

fYear

1996

fDate

6/1/1996 12:00:00 AM

Firstpage

1106

Lastpage

1119

Abstract

This paper describes the system design and performance of an optical path cross-connect (OPXC) system based on wavelength path concept. The (OPXC) is designed to offer 16 sets of input and output fiber ports with each fiber transporting eight multiwavelength signals for optical paths. Each optical path has a capacity of 2.5 Gb/s. Consequently, the total system throughput is 8×16×2.5=320 Gb/s and the OPXC features high modularity and expandability for switch components. By exploiting planar lightwave circuit (PLC) technologies, four sets of (8×16) delivery-and-coupling-type optical switches (DC-switches) are developed for the 320 Gb/s throughput OPXC system. The DC-switch offers the average insertion-loss of 12.6 dB and ON/OFF ratio of 42.1 dB. The PLC arrayed-waveguide gratings are confirmed to successfully demultiplex the eight directly modulated signals, multiplexed at a spacing of 1 nm, with a crosstalk of under -25 dB. Eight wavelength-division multiplexing signals, directly modulated at 2.5 Gb/s, are confirmed to be transported over 330 km via a cross-connection node in the test-bed system that simulates five-node network. The experimental performances demonstrated In this paper ensures full scale implementation of the proposed optical path cross-connect system with 320 Gb/s throughput and high integrity

Keywords

diffraction gratings; electro-optical switches; integrated optoelectronics; optical fibre couplers; optical fibre networks; optical losses; optical planar waveguides; optical waveguide components; telecommunication network routing; wavelength division multiplexing; 2.5 Gbit/s; 320 Gbit/s; 330 km; Gb/s throughput; PLC arrayed-waveguide gratings; cross-connect system; cross-connection node; crosstalk; delivery-and-coupling-type optical switches; directly modulated; directly modulated signals; high modularity; input fiber ports; multiwavelength signals; optical path cross-connect system; optical paths; output fiber ports; planar lightwave circuit; switch components; system design; test-bed system; total system throughput; wavelength path concept; wavelength-division multiplexing signals; Circuits; Gratings; Optical crosstalk; Optical design; Optical switches; Programmable control; Signal design; System testing; Throughput; Wavelength division multiplexing;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.511612

Filename

511612