We propose and demonstrate experimentally a novel technique for packet switching on a ring network. We use the wavelength dimension to increase the transmission line rate and a novel packet-stacking technique to add/drop packets. Packet stacking is used for transport rate multiplication and for equal loading of wavelengths on the physical layer. Packet stacking, switching, and unstacking have been successfully demonstrated on a four-node hubbed ring network serving five source-destination pairs on four wavelengths. Each wavelength was running at 1-Gb/s bit rate.

We describe a protocol for assessing aging in the tuning section of a multisection distributed Bragg reflector laser integrated with amplifier, tap coupler, and electro-absorption modulator. Under accelerated aging, we observe a transient change of nonradiative recombination followed by saturation. A simple model of aging of the Bragg section of the tunable lasers enables prediction of changes in each wavelength channel using information obtained from a single channel only.

A wavelength selectable transmitter for 2.5 or 10 Gb/s dense wavelength division multiplexed (DWDM) systems must tune across a substantial number of channels while meeting rigorous system specifications in each channel. Moreover, a tunable transmitter must feature the same level of stability, reliability and ease of use compared to single wavelength counterparts. We examine a 20-channel transmitter designed to meet the needs of high bit-rate DWDM systems.

We demonstrate a composite packet switched network serving 5 source destination-pairs. Packets are multiplexed both in time and in wavelength resulting in maximum network reconfigurability without the need for tunable receivers.

Wavelength selectable semiconductor lasers serve as tunable light sources in wavelength division multiplexed telecommunication systems. We report on 2.5 and 10Gb/s electro-absorption modulated wavelength selectable laser modules based on highly reliable, closed-loop controlled, five-section InP wavelength selectable lasers.

High power buried heterostructure 1.55 mum tunable DBR lasers have been designed, fabricated and characterized. The laser consists of a gain section, a distributed Bragg reflector, a semiconductor optical amplifier and front photodetector for automated power control. The heterostructures were grown by MOCVD with the help of selective area growth techniques and dual waveguide heterostructure. Several advantages stem from this integration scheme which include simplicity of design and fabrication, increased reliability and low cost. The laser exhibits output power of 13dBm in the fiber and is tunable over 30 (50GHz) ITU channels. The laser exhibits excellent performance and long-term control and reliability. The laser/transmitter also demonstrates significant increase of its functionality while its size remains small.

We report on a fully functional 2.5-Gb/s electroabsorption (EA)-modulated wavelength-selectable laser module meeting all long-haul transmission requirements for stability, chirp, power, and linewidth over 20 channels on a 50-GHz grid. Based on a highly integrated InP chip comprising a distributed Bragg reflector (DBR) laser, semiconductor optical amplifier, power monitor, and EA-modulator, the compact transmitter module also contains optics and control circuits necessary to ensure simultaneous long-term wavelength and mode stability. We have achieved 2.5-Gb/s transmission on all 20 channels over 680 km of standard fiber.

A wavelength selectable source within a transmitter for high-speed, dense wavelength division multiplexed systems must tune across a substantial number of channels while meeting rigorous system specifications in each channel. It must offer the same level of stability, reliability and ease of use as single wavelength counterparts. We examine a tunable source designed to meet the needs of high bit-rate DWDM systems for long-haul and metro applications

We demonstrate for the first time a 10 Gb/s EA-modulated wavelength-selectable DBR laser module with an integrated semiconductor optical amplifier. Transmission over 82 km of standard fiber with -3 dBm average power on 20 channels spaced by 50 GHz is achieved.

Tunable lasers are becoming critical in DWDM systems for reasons of increased system functionality, system adaptability and costs. Key issues that arise are wavelength tuning range, characterization of the devices, wavelength control, mode stabilization, wavelength switching times, output power and long term stability of operation. We have developed tunable EML components and transmitters that address all these issues. Transmission at 2.5 Gb/sec over 640 km of fiber has been demonstrated using an EA-DBR capable of being tuned to any one of 20 wavelengths spaced at 50 GHz. These lasers are integrated into a single package with wavelength stabilization elements and can be stabilized such that both the desired wavelength and mode are maintained during operation. These integrated modules are also incorporated into a small form factor transmitter capable of operating in DWDM systems.

Wavelength-selectable lasers are key enablers for future all-optical networks. We report on fully functional 2.5 and 10 Gb/s EA-modulated wavelength-selectable laser modules based on a highly integrated InP chip that are suitable for high-reliability telecom applications.

Fabry-Perot and distributed feedback spot size converted 1.3 /spl mu/m lasers are demonstrated with competitive performance (/spl sim/10 mA threshold, >0.30 W/A slope) and narrow (16/spl times/9) far fields capable of coupling 45% of the output light into flat cleaved fiber. The Fabry-Perot device demonstrated error-floor-free transmission at 85/spl deg/C with a wide-open eye, uncooled 2.5 Gb/s operation up to 85/spl deg/C, and reliability of 105 FITS at 50/spl deg/C. The DFB devices have good DC performance with side mode suppression ratios of >40 dB. These devices will allow passive alignment and packaging without the need for intervening optics.

We report measurements of excess wavelength chirp caused by high frequency electrical crosstalk between an electroabsorption modulator and the tuning section of a monolithically integrated DBR laser. The high tuning efficiency of the laser leads to stringent electrical isolation requirements. (C) 2000 Optical Society of America.

Clock recovery from a 160 Gbit/s optical time-division-multiplexed data stream is experimentally demonstrated using an electroabsorption modulator-based phase-locked loop. The recovered clock signal exhibits excellent stability. With an RMS timing jitter of <230 fs, a dynamic range of 25 dB, and a locking range of 16 MHz.

Single-channel transmission at 320 Gb/s is demonstrated over record length of 200 km of nonzero-dispersion fiber. Typical terrestrial amplifier spacing of 100 km is achieved by using pseudolinear transmission and distributed Raman amplification. Stable semiconductor electroabsorption modulators are used in the transmitter, demultiplexer, and clock recovery, and uncorrelated multiplexing is employed in the OTDM transmitter.