Little Optics Has Little Filters

Multicavity filters based on compact microring resonator technology have up to eleven cavities for 50GHz, 25GHz, or narrower-band apps

October 11, 2003

1 Min Read

ANNAPOLIS JUNCTION, Md. -- Little Optics announces the introduction of very high order multi-cavity filters based on its proprietary compact microring resonator technology. These filters have up to eleven cavities giving them unprecedented performance for 50 GHz, 25 GHz, or narrower band applications. They are particularly useful where high out-of-band rejection is required, or where large 3dB-to-25dB shape factors are needed. For example, rejection ratios that exceed 100 dB, and shape factors that exceed 75% are possible. Filters with various free-spectral ranges can be produced.

High order microring resonators mark a breakthrough in WDM filter technology. Almost arbitrarily high orders can be produced with microring resonators, as all cavities reside in a single dielectric layer. In thin film filter technology on the other hand, even a fourth order cavity for 25 GHz applications typically requires two to four hundred dielectric layers to be sequentially deposited. Microring resonators also have the advantage of four spatially separated ports, which gives them unique advantages in optical circuit architectures.

High order filters are part of Little Optics' library of high index contrast micro-components that can be integrated together on a single chip to produce highly functional Optical Application Specific Integrated Circuits (Optical ASIC). The microring filters can be thermally tuned to produce tunable filters with 0.5 GHz positioning accuracy.

Microring resonators are used in a variety product applications including:

  • * Amplitude filters for WDM
    * All pass filters for phase filtering
    * Tunable filters
    * Hyperfine filters (bandwidths of 12.5, 6.25 GHz or less)
    * Sensors for biological, chemical and gas detection
    * Optical spectrometers

Little Optics Inc.

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