What is meant by tunable filter?

[′tü·nə·bəl ′fil·tər] (electronics) An electric filter in which the frequency of the passband or rejection band can be varied by adjusting its components.

What is LTCC filter?

LTCC filters are multi-layer ceramic devices that integrate several inductors and capacitors for signal processing. Obtainable in compact sizes, the filters offer superior performance over discrete circuits.

What are the passive filters?

Passive filters are made of passive components (inductance, capacitance, and resistance) tuned to the harmonic frequencies that are to be attenuated. The values of inductors and capacitors are selected to provide low impedance paths at the selected frequencies.

How does an optical filter work?

Optical filters selectively transmit light in a particular range of wavelengths, that is, colours, while absorbing the remainder. They can usually pass long wavelengths only (longpass), short wavelengths only (shortpass), or a band of wavelengths, blocking both longer and shorter wavelengths (bandpass).

Which of the tunable filter is most suitable for DWDM?

Up to date, the most commonly used tunable filter structures are interferometric such as Fabry-Perot (FP) and Mach-Zehnder (MZ) interferometers[1]. They are usually poor in the performance of passband flatness and the crosstalk, and require robust electronics to stabilize the central wavelength.

What is LTCC technology?

× APITech’s LTCC is an alternative glass-ceramic multilayer substrate medium that incorporates conventional thick-film-material metal systems, providing a rugged, cost competitive substrate that can incorporate embedded passive components, along with more advanced devices such as flipchips and wire bonded bare die.

What is a band pass filter used for?

Bandpass filters are used in many applications including wireless transmitters to limit the bandwidth of the output signal to the minimum necessary.

What is the purpose of using passive filters?

A passive filter component is a combination of capacitors and inductors that are tuned to resonate at a single frequency, or through a band of frequencies. In power systems, passive filters are used to suppress harmonic currents and decrease voltage distortion appearing in sensitive parts of the system.

What is difference between active filter and passive filter?

Active filters need outside sources for their operation, while passive filters do not need any outside source for their operation. Active filters have the capability of amplifying filter output, while passive filters consume the power of the input signal and cannot amplify the output signal.

What are the two types of optical filters?

Optical filters are passive devices that allow the transmission of a specific wavelength or set of wavelengths of light. There are two classes of optical filters that have different mechanisms of operation: absorptive filters and dichroic filters.

Can we use grating as optical filter?

Diffraction gratings are desirable as narrow-band filters because they are highly dispersive. A grating, if used properly, has a dλ/dθ that may be an order of magnitude larger than that of a typical prism. Also, since they are reflective, it is possible to use gratings far into the UV.

What is LTCC used for?

The major applications of LTCC include hybrid circuits, inductors, resistors, transformers, sensors and microsystems. LTCC offers functionality such as high/low permittivity, low dielectric loss in a single multilayer package and multi-functional features by integration and interconnections.