A silicon nitride narrow-band multimode waveguide Bragg grating (NBMWBG) optical filter with high SLSR and low insertion loss based on the inverse design of MWBG is demonstrated. The complementary lateral-misalignment modulation apodization is used to create physically grating structure of NBMWBG. The insertion loss, 3-dB bandwidth and SLSR of proposed NBMWBG are measured to be 0.9 dB, 0.8 nm and 32 dB, respectively. Keywords: Silicon nitride, Bragg grating, Narrow-band,
Base on Silicon-On-Insulator (SOI), we demonstrate and compare three O-band 8-channel (de-)multiplexers based on box-shaped AWG, freeform-shaped AWG and saddle-shaped AWG for the 400 GBASE-LR8 norms. The comparison results indicate that the box-shaped AWG with large channel crosstalk of 23.3 dB, well-matched channel spacing and the FSR is more advisable choice for the 50 Gb/s PAM4 signal adopted by the 400 GBASE-LR8 standards with bandwidth of 0.14 nm.
A polarization-insensitive optical filter based on silicon and silicon nitride film is demonstrated. The lateral-shift apodization is introduced to suppress the sidelobes. The fabricated optical filter shows polarization-insensitive performances with large 3dB-bandwidths of 3.5–5.1 nm, low losses of 1.72-1 dB, decent SLSRs of 18.5-19.1 dB for both polarizations.
ultra-compact silicon mode (de)multiplexers are demonstrated based on asymmetric directional couplers with subwavelength structure (ADCWSS), the subwavelength structure is a series of corrugation on the sidewalls of waveguides, and the two arrays of corrugation extend into the gap region between the waveguides and interlace with each other. The coupling length of ADCWSS are 5.6μm, 6.5μm, and 7.9μm for TE0-TE1, TE0-TE2, TE0-TE3 mode (de)multiplexers, respectively. The four-mode mode-division-multiplexing (MDM) link was fabricated and measured. The insertion losses of TE0-TE0-TE0, TE0-TE1-TE0, TE0-TE2-TE0, and TE0-TE3-TE0 are 0.2dB, 0.7dB, 0.7dB and 0.9dB (around 1.55μm). The maximum insertion losses and crosstalk are 2.4dB, 2.9dB, 3.0dB, 4.0dB and -18dB, -19dB, -16dB, -18dB for the TE0, TE1, TE2 and TE3-mode channels over a 50-nm bandwidth.
Based on cascaded Mach-Zehnder lattice filter, an eight-channel silicon photonic (de-)multiplexer with flat passband is demonstrated in the O-band. The insertion loss of the device is -0.55~-2.48dB and the channel crosstalk is below -7dB. The FSR and channel spacing are about 36nm and 4.4nm respectively.
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