14-Pin Butterfly Package
Compact, industry-standard housing for fiber-coupled optoelectronic modules — electrical fan-out, fiber feed-through, and built-in thermal management for DFB lasers, TOSA/ROSA builds, and external-cavity tunable sources. FerraLink supplies qualified outlines with submount and DFM support for global laser and photonics programs.
Key features
14-pin DC fan-out
Standard pin field for laser diode, TEC, thermistor, and monitor photodiode — compatible with telecom module test fixtures.
Fiber feed-through
Edge or side-window options for SM/PM pigtails — up to multi-channel arrays for coherent and datacom builds.
TEC integration
Internal thermoelectric cooler pocket and thermistor routing for wavelength-stable DFB and external-cavity tunable lasers.
Hermetic sealing
Metal-ceramic construction with fine leak-rate targets suitable for long-life field deployment.
Thermal submount pairing
Pair the shell with AlN or SiC spreading submounts from FerraLink — one engineering contact for die-level and package-level thermal design.
DFM & pin-map review
Send chip outline, pad map, and fiber bend radius — we confirm keep-outs, window band, and submount footprint before quote.
Example applications
External-cavity tunable laser
The 14-pin butterfly is the de facto shell for narrow-linewidth tunable sources — TEC, isolation optics, and fiber exit in one qualified envelope.
DFB / DML telecom transmitters
C- and L-band DFB modules with monitor photodiode and TEC pins — butterfly footprint matches transceiver line cards and burn-in fixtures.
Coherent datacom & lidar engines
FMCW and coherent receivers where fiber coupling, hermeticity, and controlled junction temperature matter more than TO socket economics.
14-pin butterfly vs TO vs BOX cavity
Pick the envelope that matches fiber coupling, pin count, and assembly flow — not just cavity volume.
| Factor | 14-pin butterfly | TO56 / TO60 | BOX cavity |
|---|---|---|---|
| Fiber coupling | Pigtail / side window built-in | Cap window only | Custom window / lid |
| Pin count | 14 DC + monitor paths | 4–8 typical | Varies — often higher |
| TEC integration | Common internal pocket | Optional in TO | Flexible floor layout |
| Typical use | DFB, tunable laser, TOSA | Pump, sensor, discrete LD | Bar stack, multi-die |
| Assembly | Flex + fiber fixture | Socket on PCB | Hybrid / bench |
| FerraLink path | Quote + submount DFM | TO catalog + samples | Cavity RFQ |
Deep dive: 14-pin butterfly selection guide · TO header selection
Catalog outlines — 14-pin family
Starting points for RFQ — pin map, window band, and submount footprint are confirmed after your drawing review.
Thermal stack inside the butterfly
Junction temperature is set by the submount and attach inside the shell — not the box alone. FerraLink pairs butterfly quotes with datacom AlN submounts, laser SiC spreading, and material selection guidance so one team owns die attach through hermetic floor flatness.
Request a 14-pin butterfly quote
Share wavelength band, pin assignment, fiber type, and whether you need TEC pocket dimensions. We reply with outline options and lead time — typically within one business day.