Technical notes and assessments. Every claim comes with its primary source.
Write the 1 μm acceptance definition clearly, then hold the error with carriage-position feedback, error compensation, thermal management, and work-point geometry. The XMS ±0.75 μm is the compensated axial guarantee, corresponding to a 1.5 μm total band; a material elongation or a scale reading is not directly the work-point positioning error.
The vertical cavity (two DBR mirrors) lets VCSELs be tested at wafer level and built into arrays; combined with the 850 nm multimode ecosystem, that makes them the most economical short-reach data-center laser. This article breaks down the structure, manufacturing advantages, mainstream wavelengths, and reach limits.
Cavity structure sets spectral purity; modulation method sets speed. FPLD is cheapest but multimode, DFB is the stable single-mode workhorse behind WDM, and EML integrates a high-speed modulator on one chip. Together they form a cost × speed ladder, each matched to different links.
400G/800G/1.6T/3.2T are the total data rate of an optical module (per-lane rate × lane count), not the rate of a single wavelength or lane. This article breaks down the formula, the four standard generations (802.3bs/df/dj), PAM4 modulation and distance variants, and the electrical bottleneck plus CPO route for 1.6T/3.2T.
An optical transceiver is the standardized interface between switches and fiber: transmitter (laser + driver + modulation), receiver (photodetector + TIA + DSP), the IM-DD and coherent routes, SFP-to-OSFP packaging, and silicon-photonics integration. This article breaks down the full architecture of a modern module.
The core question of high-power manufacturing lasers: how to keep near-diffraction-limited beam quality at kilowatt-level power. The answer is MOPA — the seed sets beam quality, the amplifier sets power, and the two are decoupled; combined with multi-stage Yb-doped fiber amplification, pump combining, and isolators, verified with a concrete JPT optical path.
Examines gross margin trends using financial reports and filings from Taiwan's Market Observation Post System (MOPS).
Collects capacity and capex data disclosed at investor conferences and in annual reports.
Reviews leading applicants and technical directions from public patents.
Compiles optical-interconnect revenue disclosures from the last four quarters of earnings reports.
Tests the corrected status and the revision list at the end of an article.
Reads the original paper and extracts measured numbers such as bandwidth and drive voltage.
Compares key rates and transmission distances from public datasheets.
Reviews capex and R&D expense ratios over the last three years of reports.
Compares statements made at investor conferences against MOPS filings.