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From thin-film.com
Many new enabling optical modulation techniques rely on critical electrical filtering at both the front and back end of the electro-optical system. At the front end there are many emerging modulation techniques being developed. Optical Duo-binary systems with conventional electric components (NRZ Driver) require a low drive voltage modulator and an electrical filter exhibiting good return loss and group delay performance. At the back end there is an issue of tuning the receiver sensitivity to optimize for the spectral content of the data. These objectives have been achieved with “Enhanced Passive Bessel" filters.
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Optical modulators vary the amplitude and phase of a light beam; e.g., from a laser or by sound waves.
Passive filters are implemented using only passive components such as resistors, capacitors and inductors. These filters do not produce any amplification of the input signal.
Neutral density filters are designed to reduce transmission evenly across a portion of the spectrum. They are slightly sensitive to angles but they are much more forgiving than interference filters.
Optical spectrum analyzers (OSA) can divide a lightwave signal into its constituent wavelengths. This means that it is possible to see the spectral profile of the signal over a certain wavelength range.
Spectrum analyzers and signal analyzers display raw, unprocessed signal information such as voltage, power, period, wave shape, sidebands, and frequency. They can provide the user with a clear and precise window into the frequency spectrum.
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Topics of Interest
Thin Film Technology (TFT) is a high-speed passive component manufacturer who can provide you with custom electrical filter designs for your optical system designs. In addition to the custom filter...
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Optical Duobinary modulation has been illustrated to have higher spectral efficiency in high capacity transmission [1], and have better tolerance to chromatic dispersions due to narrower spectral...
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Absorption: The portion of optical attenuation in an optical fiber resulting from the conversion of optical power to heat; caused by impurities such as hydroxyl ions in the fiber.
A/B Switch: A...
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Filter banks composed of five or more bandpass filters fabricated on a single die have been demonstrated and are under continuing development. Such filters will find applications in multi-channel...
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Wide bandwidth filters are of interest in current and emerging wireless and system applications for use in IF circuits or as front end filters. Filters for the new GPS M code and for wireless LAN are...
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Technical Articles
High Performance Enhanced Filters for the Optical Market (.doc)
- Optoelectronics
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