Technical depth: why SiN wins in each vertical
Silicon nitride (SiN) excels wherever optical loss, coherence, optical power, or wavelength range become system-level limitations. By combining ultra-low propagation loss (<0.5 dB/m), broad transparency from the visible to the mid-infrared, negligible two-photon absorption, engineered dispersion, and scalable 200 mm CMOS manufacturing, SiN enables applications that are difficult or impossible to realize on conventional silicon photonics platforms.
Frequency metrology and optical atomic clocks: AN800 delivers Q-factors above 20 million — required for octave-spanning soliton microcombs used in national standards laboratories and chip-scale atomic clock programmes (e.g. chip-scale on-chip 1f-to-2f self-referencing interferometers locked to atomic transitions).
Quantum photonics: Negligible two-photon absorption and ultra-low loss are critical for quantum state fidelity. SiN supports quantum processors, QKD chips, and entangled photon pair sources. LIGENTEC’s QPIC1550 product targets this application directly.
Coherent transceivers and datacom: Low-loss passive routing and filtering for C-band and O-band, critical as interconnect speeds move toward 1.6 Tbit/s and passive loss budgets tighten. SiN’s advantage over SOI grows as channel count and reach increase.
LiDAR: High power handling (up to 10 W tested), broad wavelength transparency (0.8–1.7 µm for common LIDAR sources), tight bends (<10 µm) for compact folded designs, and long delay lines for FMCW coherent detection.
Biosensing and microscopy: Transparency and low loss in visible and NIR enable evanescent-field sensors, Raman spectroscopy, and refractive index sensing — fabricated in high volume on 200 mm wafers for disposable diagnostic cartridges.
Laser integration and metrology: Hybrid external cavity lasers combining III-V gain sections with SiN circuits deliver linewidths below 1 kHz, output power >200 mW, and tuning ranges >170 nm across visible to mid-IR.
In summary, silicon nitride is the platform of choice whenever performance depends on long optical path lengths, high-Q resonators, low phase noise, high optical power, or operation beyond the traditional telecom bands. These capabilities make it a leading technology for quantum systems, precision timing, advanced communications, sensing, LiDAR, and next-generation integrated laser sources.
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See also: SiN · AN800 · AN350 · Frequency Comb · QPIC · LiDAR · Heterogeneous Integration