diff --git a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/03.reflexion-refraction-raytracing/02.optical-fiber/textbook.en.md b/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/03.reflexion-refraction-raytracing/02.optical-fiber/textbook.en.md
deleted file mode 100644
index 3b5e43527..000000000
--- a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/03.reflexion-refraction-raytracing/02.optical-fiber/textbook.en.md
+++ /dev/null
@@ -1,19 +0,0 @@
----
-title: 'Optical fiber'
-slug: optical-fiber
----
-
-#### course to build
-
-<!-- ideas :
-
-1) to study the simple two homogeneous layers fiber
-
-2) talk about optical fibers with a gradient spectral index
-
-3) part M : 
-a - application in telecom 
-b - phenomenon : locally, the emerging light is a measure of the curvation
-c - luminous fontain (with beautiful video?)
-
--->
diff --git a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/03.reflexion-refraction-raytracing/02.optical-fiber/textbook.fr.md b/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/03.reflexion-refraction-raytracing/02.optical-fiber/textbook.fr.md
deleted file mode 100644
index dd0aafb63..000000000
--- a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/03.reflexion-refraction-raytracing/02.optical-fiber/textbook.fr.md
+++ /dev/null
@@ -1,18 +0,0 @@
----
-title: 'Les fibres optiques'
----
-
-#### cours à construire
-
-<!-- idées :
-
-1) étudier la fibre simple à deux couches homogènes
-
-2) parler de fibres optiques ayant un indice spectral de gradient
-
-3) partie M :
-a - application dans les télécommunications
-b - phénomène : localement, la lumière émergente est une mesure de la courbure
-c - fontaine lumineuse (avec belle vidéo?)
-
--->
diff --git a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/03.reflexion-refraction-raytracing/02.optical-fiber/topic.es.md b/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/03.reflexion-refraction-raytracing/02.optical-fiber/topic.es.md
deleted file mode 100644
index 24afaf574..000000000
--- a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/03.reflexion-refraction-raytracing/02.optical-fiber/topic.es.md
+++ /dev/null
@@ -1,19 +0,0 @@
----
-title: 'Las fibras ópticas'
-slug: optical-fiber
----
-
-#### Curso que hay que construir
-
-<!--ideas :
-
-1) estudiar la fibra simple de dos capas homogéneneas
-
-2) hablar de fibras ópticas con un índice espectral de gradiente
-
-3) Parte M :
-a - aplicación en telecomunicaciones
-b - fenómeno : localmente, la luz emergente es una medida de la curvación
-c - fuente luminosa (¿con un hermoso vídeo?)
-
--->