product focus: wdm


Lightbit's WaveXchange Optical 2R Regenerator is claimed to cut the cost of deploying 10-Gbit/sec DWDM systems, particularly over legacy fibre. It processes multiple DWDM channels on a single chip. WaveXchange increases reach by improving optical-signal-to-noise ratio (OSNR), which reduces the need for 3R optical-electrical-optical (OEO) regenerators, the most expensive network element in DWDM transport systems.

Systems that integrate WaveXchange can utilise simpler, single-stage EDFAs, further improving reach and OSNR. WaveXchange reshapes the data pulses, eliminating dispersion-compensating fibre (DCF) from the system. It thus removes the loss, OSNR degradation, and nonlinear signal impairments caused by DCF.

WaveXchange operates with any fibre type and removes up to 80 dB of loss from a DWDM link. It reshapes data pulses and suppresses distortion and nonlinear impairments caused by four-wave mixing and self-phase and cross-phase modulation.

Net to Net Technologies' EIM2000-12 Loop Bonding E1 access module is designed for the company's IPD12000 and IPD4000 modular IP DSL access multiplexers. The module supports selectable E1 data rates up to 2 Mbits/sec (symmetrical), providing up to 4 Mbits/sec of symmetrical bandwidth when used in conjunction with Net to Net's other Loop Bonding-compatible E1 products such as ENE2020-S Loop Bonding E1 modems or UIM-2E1 and MIM-2E1 DSLAM uplink modules. E1 Loop Bonding can provide redundant, business class E1 connectivity to businesses as a high-performance access service connecting an IP router or switch at the enterprise.

Adva Optical Networking added a CWDM feature to its Fibre Service Platform (FSP) 2000 that the company claims will cut costs for the enterprise and carriers. The CWDM module enables network migration to a hybrid CWDM and DWDM system. The new design can be configured with two or four channels in a network and later upgraded to a full eight-channel CWDM system or 20-channel CWDM and DWDM hybrid system. That will enable more cost-effective WDM solutions, analysis of bandwidth demand and future requirements, and migration to additional CWDM or DWDM capabilities, says Adva, "at 40% to 50% lower initial installation costs than a traditional DWDM system."

The CWDM module set was developed in response particularly to small storage projects being implemented by small- and medium-sized enterprises that may only require two to three wavelengths initially but need to add more channels in the future as SAN and LAN applications grow. The FSP 2000 CWDM feature is fully compliant with the new ITU-T G.694.2 CWDM specifications and was to be released for general availability in volume shipment in April.

OpsiTech launched a polarisation-maintaining (PM) multiplexer/demultiplexer series. Based on arrayed-waveguide-grating technology, the company says its PM multiplexer/ demultiplexers are designed for improving optical performance and reducing the cost of WDM network ownership. "OpsiTech's PM multiplexers perform high polarization extinction ratio (PER >15 dB), enabling polarization multiplexing that provides an appealing solution to double the optical-network capacity in a very competitive way," explains Jerome Prieur, vice president of sales and business development. The company's silica-on-silicon planar waveguide platform offers the flexibility to design single optical functions and allows for the highly value-added multi-optical functionalities on the same chip.

Cube Optics (CUBO) introduced what it calls the smallest available eight-channel coarse wavelength-division multiplexer (CWDM), which also provides a Flexible Fiber Connection. The compact module, with dimensions of 19¥15.5¥8.5 mm, are up to 100 times smaller than standard devices and has been designed to meet the tough space constraints of metro/access systems, the developer says. "Our customers need small-sized solutions, since CWDM communication systems often are installed where space is limited and expensive," says CUBO chief executive Thomas Paatzsch. "We help them to shrink their systems with our miniaturised CWDM COLOR-Cubes and let them efficiently use their space with our Flexible Fiber Connection, where the customer decides the location of fiber ports."

The eight-channel CWDM COLOR-Cube complements CUBO'S CWDM product family, which includes add/drops and four-channel CWDMs, and provides additional functions such as tap ports, upgrade channels, and integrated bandsplitters. Designed to work with uncooled lasers having wavelengths spaced 20 nm apart, the module's performance is independent of protocol and data rate. The device features standard market specifications, and CUBO's packaging technology has already demonstrated its excellent stability under various environmental conditions.

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