Monolithic optical device for light transmission, and multi-channel optical system using same

A light-transmitting optical device, comprising:

• a condenser element having a first lens to concentrate light in an opening of an objective, the objective having a second curved lens designed to emit or receive an optical beam, wherein,
• the first lens of the condenser element and the second lens of the objective are arranged at a first end and at a second opposite end, respectively of an integrated optical module that is achieved by a straight single-piece entity made of a transparent material having a pre-determined refractive index, and
• an intermediate zone of said integrated optical module includes a plurality of deflectors formed by a succession of dioptric surfaces which are arranged at intervals along the direction of propagation of the light flux between the first lens and the second lens so as to perform deflection outside the optical module of stray rays reflected inside the optical module, thereby preventing transmission of said stray rays either through the second lens of the objective if a light transmission coming from the condenser element is involved, or through the first lens if receiving light coming from the second lens is involved.