Polarization-independent electro-optically tunable narrow-band wavelength filter

Abstract

We propose and demonstrate the first polarization-independent electro-optically tunable wavelengh filter with single-mode waveguides. The Ti:LiNbO3 filter utilizes narrow-band electro-optic TE ↔ TM conversion and employs TE/TM polarization splitters in the input and output waveguides. The filter operates at 1.52 μm with a bandwidth of only 12 Å and can be electro-optically tuned over at least 110 Å at a tuning rate of 0.55 Å/V.

<title>Passive tunable fiber Fabry-Perot filters for transparent optical networks</title>

“…Presently, electro-optic tunable filters [11], distributed Bragg reflector (DBR) tunable lasers [12], and two-section semiconductor Fabry-Perot tunable filters [13] can tune rapidly with nanosecond response but over a very small range (a few nanometers). Acousto-optic tunable filters [14] have microsecond tuning speed and several hundred-nanometer tuning range, but their wide passband (> 1 nanometer) and low extinction ratio prohibit dense WDM.…”

Rapidly Tunable Optical Add Drop Multiplexer in Ti:LiNbO<inf>3</inf> Utilizing Non-polarizing Beam Splitters

“…Of these technologies, the electro-optic tunable filter (EOTF) can be tuned at sub-microsecond speeds needed for packet switched networks. Conventional schemes for making the EOTF [3][4][5] have several features in common. They are fabricated in birefringent materials (LiNbO 3 or LiTaO 3 ), they make use of a Mach-Zehnder interferometer configuration, and they utilize phase-matched TE↔TM polarization conversion.…”

Tunable integrated optical filter made of a glass ion-exchanged waveguide and an electro-optic composite holographic grating

“…Such an hybrid approach can be proposed as a low cost alternative to the different technologies developed in the past decades such as electro-optically [12] or acoustooptic tunable filters/switches on LiNbO 3 [13] or in fibers [14]. In this paper the first demonstration of an optical tunable filter made of a novel Bragg holographic grating with a POLICRYPS morphology written over a channel ion-exchanged waveguide diffused in BK7 glass is described.…”