# Optics Published articles for Optics. This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles. ## Multi-Core Fiber: Several Optical Cores Inside One Strand DevFeed: [Multi-Core Fiber: Several Optical Cores Inside One Strand]() Original publisher: [Read original article]() Author: j2sw Published: 2026-08-18T13:39:00Z Content type: tutorial Language: en Sources: [Justin Wilson (j2sw)]() Topics: [Hardware](), [Networks](), [interface]() Tags: [400g](), [cabling](), [channel](), [connectors](), [data-center](), [fiber](), [fiber-optics](), [internet-architecture](), [multi-core-fiber](), [network-engineering-resources](), [networks](), [optical-networking](), [optics](), [space-division-multiplexing](), [transmission]() ### AI overview This article explains how multi-core fiber places several optical cores inside one standard 125-micron cladding. It distinguishes MCF from high-fiber-count cable, describes aggregate capacity using separate channels and space-division multiplexing, and explains the need for specialized optical interfaces, connectors, splicing, and testing. ### Source excerpt Multi-core fiber places several independent optical cores inside one standard 125-micron cladding. It increases channel density, but it also requires different connectors, splicing methods, and testing procedures. The post Multi-Core Fiber: Several Optical Cores Inside One Strand appeared first on Justin Wilson (j2sw). ## Multi-Core Fiber and How It Is Used in Data Centers DevFeed: [Multi-Core Fiber and How It Is Used in Data Centers]() Original publisher: [Read original article]() Author: j2sw Published: 2026-08-12T14:27:20Z Content type: tutorial Language: en Sources: [Justin Wilson (j2sw)]() Topics: [data centers](), [datacenter]() Tags: [400g](), [cabling](), [connectors](), [data-center](), [data-centers](), [fiber](), [fiber-optics](), [it-operations](), [mpo](), [mtp](), [multi-core-fiber](), [network-engineering-resources](), [optics](), [panel](), [parallel](), [single-mode](), [structured-cabling]() ### AI overview This article explains how "multi-core fiber" is used in data center discussions, distinguishing multi-fiber or high-fiber-count cables from true multicore fiber. It covers cable construction, fiber counts, single-mode and multimode options, and MPO and MTP connectors. ### Source excerpt If you work around data centers and high-density builds, you have probably heard the term "Multi-Core Fiber" thrown around. People use it in a few different ways. Sometimes, it means a new fiber trunk that comes into a cabinet as a single cable and breaks out into dozens or even hundreds of fibers. That setup ... Read more The post Multi-Core Fiber and How It Is Used in Data Centers appeared first on Justin Wilson (j2sw). ## Profunctor Optics DevFeed: [Profunctor Optics]() Original publisher: [Read original article]() Author: Bartosz Milewski Published: 2026-07-19T11:39:02Z Content type: article Language: en Sources: [Bartosz Milewski's Programming Cafe]() Topics: [Haskell](), [Programming language](), [Programming](), [modules]() Tags: [category-theory](), [haskell](), [language](), [lens](), [mapping](), [modules](), [optics](), [profunctors](), [programming-language](), [tambara-modules]() ### AI overview This article explains profunctor optics through Tannakian reconstruction. It presents optics as a category, describes lenses and their composition in Haskell, and introduces Tambara modules as a representation that simplifies optic composition. ### Source excerpt You may think of Tannakian Reconstruction as an example of redundant encoding. It lets you replace a simple hom-set with a much more complex end that is taken over an entire functor category. Why would anyone want to do it? The answer is simple: composition! Morphisms on the left compose according to the rules of [...] ## Tambara Equipment DevFeed: [Tambara Equipment]() Original publisher: [Read original article]() Author: Bartosz Milewski Published: 2026-07-11T08:13:34Z Content type: article Language: en Sources: [Bartosz Milewski's Programming Cafe]() Topics: [modules](), [Haskell](), [Code]() Tags: [category-theory](), [code](), [double-categories](), [double-category](), [haskell](), [modules](), [optics](), [proarrow-equipment](), [profunctors](), [structure](), [tambara-modules](), [tannakian-reconstruction](), [theory](), [transformation]() ### AI overview This article explains Tambara modules through category theory and illustrates the concepts with Haskell code. It discusses their relationship to profunctors, monoidal actions, double categories, proarrow equipment, and Tannakian reconstruction. ### Source excerpt I was originally attracted to category theory when trying to understand Haskell optics. I was puzzled by the van Laarhoven's functor representations and Kmett's use of Tambara modules. By playing Tetris with the Yoneda lemma I was able to make some progress, attacking more and more esoteric topics. With a group of researcher and students [...] ## Actegories DevFeed: [Actegories]() Original publisher: [Read original article]() Author: Bartosz Milewski Published: 2026-06-30T11:45:46Z Content type: tutorial Language: en Sources: [Bartosz Milewski's Programming Cafe]() Topics: [Programming](), [Haskell](), [Code]() Tags: [actegories](), [category-theory](), [class](), [haskell](), [lens](), [optics](), [programming](), [types]() ### AI overview This tutorial introduces actegories, explaining their relationship to monoidal categories and their role in programming optics such as lenses, prisms, and traversals. It develops the concepts through Haskell models, including tensor products, unit objects, constraints, associators, unitors, and categorical actions. ### Source excerpt Previously: Kan Extensions in Double Categories. In programming, actegories play a central role in optics: lenses, prisms, traversals, etc. To understand actegories, let's start with the definition of a monoidal category. Monoidal Category A monoidal category is a category equipped with a tensor product. A tensor product is a functor . We assume that this [...]