The dependence of coupling efficiency on the fratio of the incident beam is explored. In this paper, we propose a design of a highpower fibercoupled green ld module by zemax. It is possible to focus white light into a single mode fiber. Volume 126, issue 24, december 2015, pages 59235927.
Fiber coupling design of high power cmbar laser diodes. Fine translation is obtained in these couplers with fiveaxis positioning that does not alter the angular orientation of the fiber end face relative to the focused incident beam. An inherent disadvantage highly noticeable in either case is the underutilization of optical fibre cables in terms of power transmission while. Intergrated box single mode fiber coupling duplex sc apc connector. Many singlemode fiber components include some form of optics, such as lenses or mirrors, for collecting light from a source fiber or laser and concentrating it on a receiving fiber.
Modes are the possible solutions of the helmholtz equation for waves, which is obtained by combining maxwells equations and the boundary conditions. Lenses generally compensate for the different numerical apertures nas of the laser and the fiber and otherwise provide coupling compatibility between the laser and the fiber mode fields. Design of 20 w fibercoupled green laser diode by zemax. According to different capillary diameter, there are many kinds of external diameter collimator. Observe the light beam reflected from the front face of the fiber as you bring the fiber closer. We present a new adaptiveoptics technique for the optimization of photon collection from a simulated ion. Ideally, the core of an optical fiber has an index of refraction that is uniform over the entire cross section, unless the fiber is graded index. Interested in using opticstudio, download the free trial.
Since single mode fibers core is so much smaller than a multimode fibers core, coupling light into single mode fiber requires much tighter tolerances than coupling light into the larger cores of multimode fiber. In the lab, i can connect a single mode laser with a multimode fiber and there i more info. In optical communication systems, the fibre cable plays a vital role in carrying the optical signals from one equipment to another equipment. Fiber, coupling, singlemode, single mode, sequential mode, physical optics, pop, paraxial gaussian beam, fiber coupler, coupler, m squared. Gaussian beam, tophat, fiber connector, powell lens, fred, zemax. Intensity distribution conversion from gaussian to tophat in a. Many singlemode fiber components include some form of optics, such as lenses or mirrors, for collecting light from a source fiber or laser and. To achieve good efficiency when coupling into a single mode fiber, the diameter of the input beam must match the mfd of the fiber. The process consists of placing two or more fibers adjacent to each other, then. The efficiency of coupling between semiconductor laser ld and singlemode optical fiber smf was increased by a microlens of an appropriate focal. The calculations are performed for a wide range of seeing conditions, with and without rapid image stabilization, and for a wide range of wavelengths. Pdf design of 20 w fibercoupled green laser diode by zemax. This paper combines fibercoupling fundamentals, classical optics, and diffraction theory to.
The module can produce more than 20 w output power from a standard fiber with core diameter of 400. Rp photonics encyclopedia fiber joints, connectors. Basic system setup find more information on laser and fibers. Resources knowledgebase consultants software downloads myzemax faq.
However, those tighter tolerances have proved achievable. Coupler types there are three basic types of laser to fiber source couplers. Introduction in an optical fiber, an ideal mode 1 is an eigenvector of a propagation operator. In one case, we have the problem of coupling into multimode fibers, where the ray optics of the previous section can be used. To achieve a 20 w laser beam, the spatial beam combination and polarization beam combination by polarization beam splitter are used to combine output of.
Users of the full, licensed version of opticstudio can optimize fiber coupling based on physical optics propagation calculations using the ficp merit function operand. Single mode fiber coupler 1260nm1650nm single fiber. Rich information a wealth of knowhow and howto knowledge in a searchable database. Active light systems may employ single mode and multimode fibres for the transmission of optical signals. For such components there is a direct and simple relationship between coupling efficiency and optical aberrations. Fiber coupling vs horizontal offset at position z 1. Singlemode fiber couplers provide precise, efficient singlemode coupling of a laser beam into an optical fiber. We have calculated the efficiency with which starlight can be coupled into a singlemode fiber optic that is placed in the focal plane of a telescope.
One method is based on a conventional optical analysisdesign program combining geometrical and diffraction methods, merged with calculated coupling. Single mode fiber to single mode fiber coupling efficiency and tolerance analysis. First the laser diode is simulated the side of the emitting surface on zemax,rather than seen as a point source in the design of the coupling system. Multiaxis singlemode fiber couplers newport corporation. Simulation and characterization of microoptics for fiber coupling start. In fact, the coupling to singlemode fiber has been extensively investigated. New download a demo test drive opticstudio 15 yourself and see why more optical and illumination design professionals choose zemax. Efficient coupling into singlemode or multimode optical fibers is essential for many fiberoptic laser beam delivery applications such as telecommunications, oil and gas fiberoptic sensors, laser angioplasty, biomedical fiberoptic cables, multicell laser excitation systems, turbine engines fluorescence thermometry and static pressure measurements, endoscopy, fiber. Truefreeform in opticstudio enables a unique nonparameterized optimization methodology for optical design. Are you concerned that because the properties of the focussed light does not have the same properties e. Effect of lateral error on the coupling efficiency and beam quality of. The effect of the lateral and transversal offset on the coupling efficiency has been investigated. F or single mode fibers, a chieving a high coupling efficiency requires that the optical field matches well to the mode field of the optical fiber.
Light emerges from a source fiber to fill or partially overfill the entrance pupil of an optical system. Fiber optic cable adapter coupler scsc simplex singlemode 5 pack. The problem of coupling light into an optical fiber is really two separate problems. Mode matching for efficient laser diode to single mode. In order to simplify this, place a microscope glass slide at and angle 45 degrees with respect to the beam path between laser and lens. Osa coupling efficiency of optics in singlemode fiber. Our technique uses a genetic algorithm to correct wavefront aberrations via deformable mirror before coupling into a singlemode fiber. Numerical aperture limits on efficient ball lens coupling. The design is flexible, allowing a wide variety of configurations.
Two spherical lenses based on as2s3 and as2se3 have been used to this purpose. Parametric optimization of fiber coupling lenses lighttrans. We represent a design of a 20 w, fibercoupled diode laser module based on 26 single emitters at 520 nm. Theoretical knowledge efficient multimode to singlemode fiber coupling. A demonstration of how to couple a laser in free space into an optical fiber. The type of lens used greatly depends on the source size and beam divergence. Single mode fiber coupler 1260nm1650nm single fiber collimator clens. In order to further increase the fibercoupled module output power, eight cmbar 808 nm laser diodes, 50 w output each, fiber coupling module has been designed by using zemax optical design software through space and polarization beam combination method. One of the key challenges in coupling light into a singlemode fiber is to find out the focal plane of the lens. It has been found that double ball lenses coupling scheme is efficient and more effective for mode matching of highly elliptical large divergence ratio laser diode mode field with the circular mode field of a single mode fiber, whereas for small divergence ratios the single ball lens is adequate.
Various schemes exist for coupling light from a source into a fi ber. Coupling between pc and smf fibers using zemax interoperability. To obtain high power, high brightness semiconductor laser beam output, a 976nm wavelength fiber coupling module with 12 singleemitter laser diodes has been designed using zemax optical design. Singlemode fibertosinglemode fiber coupling efficiency and tolerance analysis.
The main criterion is that the angle of convergence of the light must fit inside the angle of acceptance of the fiber. Apn0004 laser to fiber source couplers application notes. In fiberoptic communication, a singlemode optical fiber smf is an optical fiber designed to carry only a single mode of light the transverse mode. Singlemode fiber coupling in opticstudio zemax zemax. Mode coupling 1 enables transfer of energy from one ideal mode to another during propagation. Overview of ledtomultimodeoptical fiber coupling 3 1. Authored by namhyong kim, updated by kristen norton abstract.
Singlemode fibertosinglemode fiber coupling efficiency. The coupling of the optical signal from a multimode to a singlemode fiber is a critical issue in application fields that involve numerical aperture optical systems and high accuracy optical characterization tools, such as astronomy and laser testing. Balllens coupling efficiency for laserdiode to singlemode fiber. For more sophisticated demands, one may use rp fiber power definition. Licensed users can also explore single mode fiber coupling in further detail in the knowledgebase. Coupling a laser into a single mode fiber manoj peiris. In the other case, coupling into single mode fibers, we have a fundamentally different problem. As expected, coupling into a narrow fiber has reduced the efficiency. Mode coupling can be induced by random or intentional index. Design of a 36w fibercoupled green laser diode by zemax. Based on multiemitters, fiber coupling module commonly uses beam quality is constant through ideal lens to calculate. Single mode light coupling into multimode fiber optiwave.
We also use the imae operand to optimize the system for multi mode fiber. Coupling efficiency of optics in singlemode fiber components osa. Please sign in to read the full article, or click here to request portal access. However, the progress in coupling multiple single green emitters into the. In this article, we demonstrate gridbased sag optimization of the truefreeform surface in designing a wedge prism for arvr applications, greatly improving imaging quality for the eyetracking subsystem. Singlemode optical fiber is an optical fiber in which only the lowest order bound mode can propagate at the wavelength of interest typically 0 to 20nm. Simulation of the alignment sensitivity on the coupling. A novel method to increase the coupling efficiency of. A method designs of high coupling efficiency fiber coupling system between a singlemode fiber and a laser diode based on zemaxs pure nonsequential components. Adaptive optics for singlephoton fiber coupling of ions. The alignment sensitivity of the coupling efficiency for this lasertolenstofiber optical configuration is investigated in detail.
A ficl ray based fiber coupling efficiency calculation ray based method to compute the fiber coupling efficiency. Fiber optic cable adapter coupler scsc simplex singlemode. Fiber collimator is optical fiber head pigtail and precise alignment lens packaged. Singlemode fiber supports one mode, which consists of two orthogonal polarization modes. A double ball lens coupling scheme has been designed.
Our single mode pigtailed collimators come with one meter of fiber, consist of an arcoated aspheric lens prealigned with respect to a fiber, and are collimated at one of eight wavelengths. The package tube has a glass tube with goldplated tube two kinds. Zemax offers two different possibilities to compute the coupling efficiency for single mode fibertofiber coupling. Optimum coupling occurs when ld and smf spot sizes are matched. Accurate analysis of coupling efficiency is critical in the design of fiber coupling systems. We used a roithner rlt7605mg 5 mw single mode laser diode as source. These modes define the way the wave travels through space, i. In this case, one must consider the problem of matching the mode of the incident laser.
How to optimize the fiber coupling lens to achieve. Home forums system single mode light coupling into multimode fiber single mode light coupling into multimode fiber ahmad mustafa joined april 2014 participant dear all, i have a basic question on multimode fibers in optisystem. Interested in using opticstudio, download the free. Laser diode to fiber coupling analysis photon engineering. Single mode fiber single mode fiber optic cable fosco.
Numerical simulation of the coupling efficiency for the light emitting from a commercially available balllens capped tocan laser diode into a singlemode fiber smf is reported. Single mode optical fiber coupling to a laser diode. Zemax software was used to optimize the design of an optical system. Pdf improvement of laser to fiber coupling efficiency using. This article demonstrates the use of the geometric image analysis feature to compute multi mode fiber coupling efficiency. Fiber, coupling, singlemode, single mode, sequential mode, physical optics, pop, paraxial gaussian beam, fiber coupler, coupler, m squared, m2, m2, msquared. Authored by mark nicholson, kristen norton abstract. This article demonstrates the use of several fiber coupling efficiency analyses in opticstudio. Coupling light emitting diodes to multimode optical fibers. With the fiber optics software rp fiber calculator pro, one can conveniently calculate coupling losses at misaligned fiber joints. In the other case, coupling into singlemode fibers, we have a fundamentally different problem. Osa coupling starlight into singlemode fiber optics. Thereafter, multitransverse mode continuous wave cw green lds with an. Zemax offers two different possibilities to compute the coupling efficiency for single mode fiber to fiber coupling.