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OPTIMIZED PERFORMANCE FOR WDM PASSIVE OPTICAL NETWORKS

The Centre for Integrated Photonics has developed a reflective semiconductor optical amplifier offering highly optimised performance for WDM passive optical network (PON) applications.
The Centre for Integrated Photonics has developed a reflective semiconductor optical amplifier offering highly optimised performance for WDM passive optical network (PON) applications. Capable of delivering 20 dB of gain, the semiconductor optical amplifier (SOA) can be modulated at rates up to 1.5 Gbits/sec to provide wavelength-agile optical data transmission facilities for clients in fibre-to-the-home/premises (FTTH/FTTP) access network architectures - without the expense of a tuneable wavelength source.

A novel curved waveguide architecture inside the monolithic InP (indium phosphide) based SOA, the SOA-RL-OEC-1550, delivers smooth output characteristics with a ripple of just 0.5 dB typical and a polarisation-dependent gain of 1.5 dB typical. This highly optimised performance provides the first practical building block for the development of flexible and cost-effective PONs based on wavelength division multiplexing (WDM).

"A lot of PON development is in progress, but for this kind of optical transmission architecture we're seeing engineers using prototypes based on standard SOAs with less than optimal anti-reflection characteristics," says Neil Weston of The Centre for Integrated Photonics (CIP). "This reflective SOA offers application-specific performance to support development and trials, and is based on a monolithic device design that is well suited to high-yield, low-cost volume manufacture."

The SOA-RL-OEC-1550 has ultra-low front facet reflectivity (<10-5), and is ideal as a reflective colourless amplifying modulator in WDM-PON schemes, or as a gain block for external cavity lasers. The device employs CIP's proprietary InP buried heterostructure design, which delivers very high light confinement. It is available in a 7-pin butterfly/SMA package with a thermistor, thermo-electric cooler, single-mode fibre pigtail and a 50 ohm input impedance matching circuit, or as a custom chip-on-carrier product.
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