Tunable channel-drop filters consisting of polymeric Bragg reflectors and a mode sorting asymmetric X-junction

Abstract

A tunable channel-drop filter as essential component for the wavelength-division-multiplexing optical communication system has been demonstrated, which is based on polymer waveguide Bragg reflectors. For an ordinary Bragg reflector, the filtered signal is reflected toward the input waveguide. Thus an external circulator is required to separate the filtered signal from the input port, though it increases the total footprint and cost. For this purpose, we employed dual Bragg reflectors and a mode sorting asymmetric X-junction. The Bragg reflector exhibited a maximum reflectivity of 94% for a 6-mm long grating, a 3-dB bandwidth of 0.39 nm and a 20-dB bandwidth of 2.6 nm. The mode sorting crosstalk in asymmetric X-junction was less than -20 dB, and linear wavelength tuning was achieved over 10 nm at the applied thermal power of 377 mW.

Detuned Plasmonic Bragg Grating Sensor Based on a Defect Metal-Insulator-Metal Waveguide

“…In the past few years, several novel photonic devices based on SPPs, such as triangular waveguides [ 3 ], absorption switches [ 4 ], reflectors [ 5 , 6 , 7 ], and absorbers [ 8 ] have been investigated. Particularly, the MIM Bragg reflectors have a wide range of applications in optical communication fields such as optical filters [ 9 ], which have been theoretically proposed and experimentally demonstrated, single-cavity and multi-cavity structures filters [ 10 ], and tunable channel drop filters [ 11 ].…”

Compact 2×2 parabolic multimode interference thermo–optic switches based on fluorinated photopolymer

“…[5][6][7][8][9] Compared with the fiber-type TO optical switches, the waveguide-type TO switches have captured considerable interest such as functional compact photonic chips with smaller size, lower driving power consumption and faster response. Diversified TO waveguide switching structures have been used in actual optical chips, such as x-junction, [10,11] Mach-Zehnder interference (MZI), [12][13][14] directional coupling (DC) and multimode interference (MMI) type, [15][16][17][18][19] etc. Compared with the other structural TO waveguide switches, the MMI TO waveguide switches with highintegration and lower process tolerance are more suitable to realizing N × N multi-channel integrated switching matrixes for high-quality photonic chips.…”

Light-Induced Waveguide With Directional Transmission

“…Currently, among all the photonic integration technologies, polymer-based integration technology offers many distinctive advantages, such as ease of processability, high flexibility, and ease of synthesis of various materials with various optical properties. Meanwhile, the polymeric optical waveguides [5] and components, such as arrayed waveguide grating [6]- [8], splitter [9], optical switch [10], and filter [11], [12], also have attracted much attention for use in optical interconnects and in integrated devices for optical communications in the access network and the home network areas To date, the polymeric optical waveguides can be fabricated by multistep processes using lithography [13]- [15], laser-writing [16], and ion etching [17]- [19]. Since these processes require time and patience, many types of simple and low-cost polymer optical waveguide fabrication methods were reported which included a laser lithography method [20], a light-induced polymerization method [21], and a hot-embossing method [22].…”