InP-based 64-channel arrayed waveguide grating with 50 GHz channel spacing and up to –20 dB crosstalk

Compact SOI-based polarization diversity wavelength de-multiplexer circuit using two symmetric AWGs

“…One such compact component in SOI is the arrayed waveguide grating (AWG) [1,2], which is commonly used for wavelength division multiplexing (WDM) in telecoms networks. Highly confined silicon waveguides allow a significant reduction in footprint of AWGs compared to traditional low-contrast waveguide platforms [3][4][5]. But the high contrast waveguides severely impact on the performance of the AWGs: sidewall roughness introduces losses, as well as phase errors in the delay lines, and similarly, silicon thickness variations can affect the dispersion and therefore the intended channel spacing.…”

Arrayed‐Waveguide Gratings

“…This 15 15 channel device measured 1 cm 2 and had an insertion loss of 2 7 dB and a crosstalk > 18 dB. The InP-based device with the largest number of channels so far is a 64-channel AWG with dimensions 3.6 7 mm 2 reported by NTT [100], and it has a crosstalk level better than 20 dB. Small device dimensions are achieved by applying deeply etched waveguides with a high lateral index contrast which allow for small bending radii.…”

Low-loss, compact, and polarization independent PHASAR demultiplexer fabricated by using a double-etch process

“…Compact PHASAR-demultiplexers have been reported with high-contrast nonbirefringent waveguides [7]- [10] or high-contrast waveguides with a birefringence compensation [11].…”