High Sidelobe Suppression Research Articles

Horizontal directional coupler filter suitable forintegration in a 1.3 + /1.3 - µm duplexer

The authors report the design and first realisation of a grating-assisted horizontal directional coupler filter exibiting a highly reduced polarisation sensitivity (below 1 dB on the filtered channel) and a high sidelobe suppression ratio (>25 dB for both polarisations). This filter is particulary suitable for integration in a 1.3+/1.3-µm duplexer.

Lithium niobate electro-optic tunable filter with high sidelobe suppression

The first demonstration of a high sidelobe suppression, tunable, electro-optic filter fabricated in lithium niobate for 1.55 μm is reported. Weighting of the mode convenor structure using a Taylor distribution resulted in a −3 dB passband width of 1.6 nm and nearest sidelobes of −25 dB. A continuous, linear electro-optic tuning rate of ±30 V/nm is also reported.