Broad-spectral-range synchronized flat-top arrayed-waveguide grating applied in a 225-channel cascaded spectrometer.
Optics express（2013）
摘要
We present a new synchronized design for flattening the passband of an arrayed-waveguide grating (AWG) over a broad wavelength range of 90 nm. A wavelength-insensitive 3-dB balanced coupler is designed to be used in duplicate in a Mach-Zehnder interferometer (MZI); the phase deviation created by one of the balanced couplers is cancelled by flipping the other coupler around. This MZI is arranged in tandem with the AWG such that the output signal of the MZI is the input signal of the AWG. We demonstrate a 5-channel, 18-nm-spacing AWG with a 0.5-dB bandwidth of 12 nm over a 90-nm spectral range. A low-loss cascaded AWG system is demonstrated by using the MZI-synchronized flat-top AWG as a primary filter.
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关键词
output channels,size 149 mum,large device size,size 34 mum,wavelength 90 nm,nonadjacent crosstalk value,mach-zehnder-interferometer synchronized awg,central excess-loss value,loss 30 db,delay length,loss 4.5 db,high-density cascaded multiplexer/demultiplexer systems,wavelength 18 nm,multiplexing equipment,mach-zehnder interferometers,loss 3 db,fsr,wavelength dependency,electrical heaters,loss 1 db,box-like pass band,arrayed waveguide gratings,transmission spectrum,insertion loss,balanced couplers,central output waveguides,thermal tuning effect,outer output waveguides,size 0.281 mum,optical communication equipment,optical losses,fabrication-related performance degradations,optical filters,wavelength 20.4 nm,secondary awg,optical crosstalk,primary filter,225-channel cascaded spectrometer,optical directional couplers,directional couplers,spectrometers,primary flat-top awg spectrometer,intrinsic loss,mzi-synchronized awg configuration,wavelength resolution,wavelength 0.4 nm,broad-spectral-range synchronized flat-top arrayed-waveguide grating,pass-band flattening method,loss 3.5 db,flattened pass band,low-loss cascaded awg system,band-pass filters,straight coupler section lengths,mach zehnder interferometer
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