What is meant by tunable filter?

The tunable filter arrangement consists of an off-the-shelf DWDM filter seated on a silicon MEMS device consisting of a square platform and an actuation system composed of an array of thermal actuators, thereby creating a compact hybrid MEMS device.

What is tunable RF filter?

Tunable filters at RF and microwave frequencies can po- tentially place an important role in the implementation of future reconfigurable wireless systems. This typically requires the ability to reconfigure the radio’s hardware and particularly the RF front-end, over a wide frequency range.

Why use tunable filter?

For some applications, one requires optical filters where certain filter parameters are tunable – either manually or with an electronic control system. There are also tunable filters where the filter transmission can be tuned independently for a wide range of wavelengths.

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.

How do optical filters 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).

What are the tunable optical source?

Among the types of tunable lasers are excimer lasers, gas lasers (such as CO2 and He-Ne lasers), dye lasers (liquid and solid state), transition metal solid-state lasers, semiconductor crystal and diode lasers, and free electron lasers.

What does an RF filter do?

RF filters are electronic components that are used to allow or prevent selected signals or frequencies in order to eliminate noise or pass through of unwanted signals.

What is the function of band pass filter?

Band-pass filter, arrangement of electronic components that allows only those electric waves lying within a certain range, or band, of frequencies to pass and blocks all others.

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.

What are types of filter?

Filters can be active or passive, and the four main types of filters are low-pass, high-pass, band-pass, and notch/band-reject (though there are also all-pass filters).

Is Tunable a laser?

A tunable laser is a laser whose wavelength of operation can be altered in a controlled manner. While all laser gain media allow small shifts in output wavelength, only a few types of lasers allow continuous tuning over a significant wavelength range.

Why is a tunable laser of importance in optical networking?

If a single tunable laser can replace an array of fixed-wavelength lasers, then the optical network will realize step function increases in flexibility and capacity, with massive reductions in network complexity, wavelength contention, and investment in inventory.

What’s the tuning range of a tunable filter?

A design method is suggested to maximize TR and optimize Q . This method demonstrates tunable resonators and ﬁlters with higher Quand tuning range than the state-of-the-art with similar technologies. A two-pole ﬁlter with tuning range of 0.5–1.1 GHz and measured insertion loss of 1.67 dB at 1.1 GHz is demonstrated.

What are the keywords for tunable filters?

Keywords— combline ﬁlter, combline resonator, evanescent-mode design, ﬁlter design, ﬁlters, full-wave simulation, measurement and modeling, modeling, tunable ﬁlters, tunable resonators, waveguide ﬁlters I. INTRODUCTION RECENTLY, there has been a growing interest in tunable RF/microwave ﬁlters.

Is there a dynamically tunable transmissive color filter?

Here we report a dynamically tunable, transmissive color filter by incorporating an ultra-thin phase change layer inside a thin-film optical resonator. The transmitted color spectrum can be designed over the entire visible range and shifted by around 50 nm after phase transition.

What is the definition of a tunable metamaterial?

A tunable metamaterial is a metamaterial with a variable response to an incident electromagnetic wave. This includes remotely controlling how an incident electromagnetic wave (EM wave) interacts with a metamaterial.

What is meant by tunable filter? The tunable filter arrangement consists of an off-the-shelf DWDM filter seated on a silicon MEMS device consisting of a square platform and an actuation system composed of an array of thermal actuators, thereby creating a compact hybrid MEMS device. What is tunable RF filter? Tunable filters at RF and…