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A colorless ONU is demonstrated on the polymer-based hybrid integration platform. Polymer Bragg gratings provide power-efficient wavelength tuning over the C-band. Thin-film element is inserted in the waveguide circuits for C/L band splitting and bi-directional transmission. On-chip U-groove and 45° mirror allow submount-free and passive attachment of optical fiber and photo detectors, respectively. Arrays of deep-etched air trenches are introduced for cross-talk suppression. With an optical wavelength rejection level larger than 34 dB, 10-Gb/s bidirectional transmission and detection are achieved. [ABSTRACT FROM PUBLISHER]

Multicore, compact, and low-crosstalk polymer waveguides have been designed, fabricated, and characterized. These single-mode waveguides are arranged in five layers following a hexagonal lattice with 20-\(\mu \) m pitch. The waveguides exhibit similar propagation loss of <;1 dB/cm (at 1550 nm) without any polarization-dependent effect. The interwaveguide crosstalk remains below -40 dB at 3.8-cm propagation length. A series of multistep 45° mirrors have been introduced to extract light from each of the individual layers. The mirror loss ranges from 1.5 to 1.9 dB, with deep mirrors being gradually more loss-prone due to the free-space beam broadening. [ABSTRACT FROM PUBLISHER]