Glossary | Co-Pac Optics

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2xDR4: Two DR4 interfaces in one module. The 1.6T OSFP224 2xDR4 carries 8 lanes of 200G on a dual MPO-12/APC connector. Source: 1.6T OSFP224 2xDR4 optical transceiver technical data (OSFP-1.6T-2xDR4), manufacturer datasheet, Rev 1.0, 2026-03-12.

Breakout: Splitting one high-speed port into several lower-speed links. The 1.6T DR8 breaks out to 2 × 800G DR4 or 8 × 200G DR. Source: Manufacturer product specification, 1.6T OSFP224 DR8 Closed-Top.

CMIS: Common Management Interface Specification. A standard software interface a host uses to read status from and configure a pluggable module. The 1.6T 2xDR4 datasheet lists CMIS support. Source: 1.6T OSFP224 2xDR4 optical transceiver technical data (OSFP-1.6T-2xDR4), manufacturer datasheet, Rev 1.0, 2026-03-12.
Co-packaged optics (CPO): A design that places optical engines in the same package as the switch chip instead of in pluggable modules. Co-Pac Optics does not sell CPO. Source: Co-Pac Optics website positioning directive.

DDM: Digital diagnostic monitoring. The module reports its own temperature, supply voltage, Tx bias, Tx power and Rx power to the host. Source: 1.6T OSFP224 2xDR4 optical transceiver technical data (OSFP-1.6T-2xDR4), manufacturer datasheet, Rev 1.0, 2026-03-12.
DR4: A parallel single-mode optical interface with four lanes and a 500 m reach. Each lane uses one transmit fiber and one receive fiber, so 8 fibers are used on an MPO-12 connector. Source: Manufacturer product specification, 800G OSFP224 DR4 RHS.
DR8: A parallel single-mode optical interface with eight lanes and a 500 m reach. It uses 16 fibers, on one MPO-16 connector or two MPO-12 connectors. Source: Manufacturer product specification, 1.6T OSFP224 DR8 Closed-Top.

IHS (integrated heat sink): A heat sink built into the module. The 1.6T OSFP224 2xDR4 has a top closed fin design, which is an integrated heat sink. Source: 1.6T OSFP224 2xDR4 optical transceiver technical data (OSFP-1.6T-2xDR4), manufacturer datasheet, Rev 1.0, 2026-03-12.

MPO-12/APC: A multi-fiber push-on connector with 12 fiber positions and an angled physical contact (APC) polish. Source: 1.6T OSFP224 2xDR4 optical transceiver technical data (OSFP-1.6T-2xDR4), manufacturer datasheet, Rev 1.0, 2026-03-12.

OSFP: Octal Small Form-factor Pluggable. A hot-pluggable optical module form factor defined by the OSFP MSA. Source: OSFP MSA module specification, Rev 5.22.
OSFP224: The name the manufacturer's datasheets use for OSFP modules with 200G-class lanes: 8 lanes on our 1.6T modules and 4 lanes on the 800G DR4. Source: 1.6T OSFP224 2xDR4 optical transceiver technical data (OSFP-1.6T-2xDR4), manufacturer datasheet, Rev 1.0, 2026-03-12.

PAM4: Four-level pulse amplitude modulation, the signaling listed for the lanes of our 1.6T and 800G modules, for example 8 x 200G PAM4 on the 1.6T 2xDR4. Source: 1.6T OSFP224 2xDR4 optical transceiver technical data (OSFP-1.6T-2xDR4), manufacturer datasheet, Rev 1.0, 2026-03-12.
Pluggable optics: Optical transceivers in standard form factors such as OSFP, QSFP112 and QSFP-DD that insert into and remove from a port on a switch or server. Source: OSFP MSA module specification, Rev 5.22.
Pre-FEC BER: Bit error ratio measured before forward error correction is applied. The 1.6T 2xDR4 datasheet gives a pre-FEC BER of 1×10⁻⁶ and a post-FEC ratio of 1×10⁻¹² with host FEC. Source: 1.6T OSFP224 2xDR4 optical transceiver technical data (OSFP-1.6T-2xDR4), manufacturer datasheet, Rev 1.0, 2026-03-12.

QSFP-DD: QSFP Double Density, a QSFP form factor. Our catalog lists a 400G QSFP-DD SR8 module. Source: Manufacturer archived product specification, 400G QSFP-DD SR8 (retired below-800G archive).
QSFP112: A Quad Small Form-factor Pluggable form factor. The manufacturer's presentation lists 4 x 53.125 GBd PAM4 for QSFP112. Our catalog lists 400G QSFP112 DR4 and VR4 modules. Source: Manufacturer 2026 optical modules engineering presentation.

RHS (riding heat sink): A module design with no integrated heat sink: the host cage supplies the heat sink, which rides on the module (OSFP MSA). Our 800G OSFP224 DR4 uses it. Source: OSFP MSA module specification, Rev 5.22.

Silicon photonics: An optical engine technology that builds optical components on silicon chips. The 1.6T OSFP224 2xDR4 datasheet lists silicon photonics as its optical engine. Source: 1.6T OSFP224 2xDR4 optical transceiver technical data (OSFP-1.6T-2xDR4), manufacturer datasheet, Rev 1.0, 2026-03-12.
SR8: A short-reach multimode interface with eight lanes at 850 nm. The 400G QSFP-DD SR8 on our catalog list is rated for 100 m over OM4 fiber. Source: Manufacturer archived product specification, 400G QSFP-DD SR8 (retired below-800G archive).

VR8: A short-reach multimode interface with eight lanes at 850 nm. The 800G OSFP VR8 on our catalog list is rated for 50 m over OM4 fiber. Source: Manufacturer product specification, 800G OSFP VR8.

Discuss 1.6T and 800G distributor allocation, custom White-Label OEM branding, or platform verification directly with Mike Clarke.