Hideyuki Miyata

FM response of narrow-linewidth, multielectrode lambda /4 shift DFB laser

Flat FM response from 100 kHz to 15 GHz was achieved in a multielectrode distributed-feedback (DFB) laser. A lambda /4-shifted corrugation and a 1200- mu m-long cavity were very effective not only in reducing the linewidth to less than 1 MHz, but also in making FM response flat by selective current injection.<<ETX>>

Measuring the longitudinal distribution of four-wave mixing efficiency in dispersion-shifted fibers

We measured and analysed four-wave mixing (FWM) efficiency and fluctuation along the actual dispersion-shifted fibers (DSFs). In the short, 1.1-km DSF, our results agreed with theory, and we also obtained zero-dispersion wavelength /spl lambda//sub 0/, zero-dispersion slope dD/d/spl lambda/, and nonlinear refractive index n/sub 2/ simultaneously. In the long, 23-km, DSF, a high FWM efficiency was observed in the wide wavelength region, due to the longitudinal zero-dispersion wavelength distribution. The fluctuation range was about 3.5 nm and the maximum slope about 1.1 km/nm.<<ETX>>

Field trial of data-granularity-flexible reconfigurable OADM with wavelength-packet-selective switch

Reconfigurable optical add/drop multiplexers (ROADMs), which enable dynamic and flexible node-to-node connection via wavelength paths, are key components in metro ring network nodes. A data-granularity-flexible ROADM node that combines a wavelength-tunable filter, and an optical packet ADM (PADM) has been proposed and demonstrated. In this paper, the first field trial of the data-granularity-flexible ROADM network with wavelength- and packet-selective switch is demonstrated using a novel concurrent generation technique of address-reconfigurable optical-code (OC) labels and payload data. Bit error rates (BERs) of less than 10/sup -12/ for all 16-wavelength channels are obtained over 90 km of transmission at 10 Gb/s.

Fully dynamic and reconfigurable optical add/drop multiplexer on 0.8 nm channel spacing using AOTF and 32-wave tunable LD module

We developed and confirmed the feasibility of a dynamic optical add drop multiplexer (OADM) system using an acousto optical tunable filter (AOTF) and a wavelength tunable LD module. A 4-concatenation transmission of this system was performed successfully.

Impact of Polarization Dependent Loss and Cross-Phase Modulation on Polarization Multiplexed DQPSK Signals

We investigated PolMux-RZ-DQPSK signal degradation modes due to PDL and XPM in WDM transmission with co-propagating NRZ signals. SNR degradation due to PDL and XPM-induced polarization dependent phase noise greatly impact transmission system.

Compact photonic gateway for dynamic path control using acousto-optic tunable filter

A compact photonic gateway for wavelength-path control with a simple configuration at low cost was developed. The gateway achieves wavelength-path control by using acousto-optic tunable filters (AOTF). The fabricated four-channel integrated AOTF device exhibits a high performance with regard to polarization-independent characteristics, side-lobe suppression, higher extinction ratio, and narrower bandwidth for 100 GHz spacing. An AOTF subsystem was fabricated by combining an AOTF with the control circuit to exploit the AOTFs high-speed switching to the full and operate it stably for practical use and achieve stable operation of the AOTF. We manufactured the photonic gateway node by assembling the AOTF subsystem with the provisioning control and redundant system.

Bandwidth and ripple requirements for cascaded optical (de)multiplexers in multiwavelength optical networks

In conclusion, we evaluated the influence of the transmittance slope of the cascaded MUX/DMUXs. We proposed to determine the requirements for the bandwidth and the ripple of the MUX/DEMUX from this transmittance slope. In 16 spans (32 stages), there is tolerable ripple range per stage. Assuming that the MUX/DEMUXs are a third-order Butterworth filter, the optimum bandwidth is 1.1 nm.

40 Gbit/s packet-wavelength-selective, reconfigurable optical add/drop multiplexing using label-selectivity-enhanced optical en/decoder and wide-passband AOTF

We demonstrate the packet-wavelength-selective reconfigurable OADM network on 16-wavelength /spl times/ 40-Gbit/s NRZ signal using a label-selectivity-enhanced optical en/decoder and wide-passband AOTF. Error-free operations for all 16-wavelength channels at three nodes with 100-km transmission are realized.

Field trial of granularity-flexible reconfigurable OADM with wavelength-packet-selective switch using concurrent generation technique of optical code label and payload data

We demonstrate the first field trial of a granularity-flexible ROADM (reconfigurable optical add/drop multiplexing) network with a wavelength-packet-selective switch using concurrent generation technique of address-reconfigurable optical code label and payload. Error-free operations for all 16-wavelength channels are obtained over 90-km transmission.