Kazuo Hironishi

Evaluation of FSK light labels superimposed on 112 Gbps DP-QPSK signal with real-time coherent receiver and optical filter based decoder for light path tracing

We experimentally evaluate the feasibility of FSK light labels superimposed on 112 Gbps DP-QPSK signals using real time digital coherent receiver and optical filter based light label decoder.

Crosstalk Analysis of FSK Light Label on 112 Gbps DP-QPSK Signal in CNCG ROADM Network

We investigated crosstalk of FSK supervisory channel superimposed on a 112 Gbps DP-QPSK caused by pass-band narrowing effect in CNCG ROADM network. We estimated maximum number of ROADM nodes and frequency misalignment tolerance between main signal and center frequency of WSS pass-band that the FSK light label technique could support.

Optical cross-connect architecture using free-space optical switches based on PI-LOSS topology

An optical cross-connect (OXC) system is an essential ingredient needed to create an optical transport network for B-ISDN. We propose an OXC architecture, incorporating failure restoration based on reserved wavelengths, which consists of a routing block and bypass block. We compare the number of required optical devices in our structure with a conventional structure. We also propose a polarization controlled free-space switch based on path-independent insertion loss (PI-LOSS) topology, adopt it to the routing block, and demonstrate a 4/spl times/4 prototype free-space switch.