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To be eligible for a return, your item must be unused and in the same condition that you received the product as well as the original box and packaging. A 20% restocking fee will apply to all returns or exchanges.

This relates the cone angle to the refractive indices. The larger the acceptance angle, the wider the cone, allowing higher light input.

The cone angle depends on the core diameter and fiber numerical aperture (NA). A wider cone (larger NA) enables more light propagation in the fiber.

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A solid black backdrop that is totally non-reflective is made from 100% brushed cotton and is double sided. This material is heavier than any of our other solid black photography backdrops. Photo black is great for location photo shoots and studio sessions alike. Black backdrops are sometimes called the invisible backdrop because this black fabric is non-reflective, totally opaque. Please Note sizes are listed width by height.

If you are not satisfied with your purchase, we do offer a 30 day return policy. Please contact us within 30 days of receipt of your order. >Customerservice@dennymfg.com or 1-800-844-5616.

Velvet Backdrop Material: Printed on our high-quality, matte, velvet style material, these backdrops offer the most vibrant color rendition. Compact storage and can be washed and dried in household machines. Fold for storage.

On the other hand, a single-mode fiber is designed to only support one mode – a single straight path down the core. No matter what angle the light enters, it is confined to this fundamental mode.

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The numerical aperture (NA) measures an optical fiber’s ability to gather and transmit light. It indicates how much light the fiber can collect from the source.

The number of possible modes depends on the fiber properties. In a multimode fiber, there can be hundreds or thousands of different mode paths. Each mode takes a different angle path down the core, creating a unique “bouncing” pattern.

Top Pole Pocket: 3” pole pocket sewn across the top of the backdrop. Ample space for a crossbar to slip through for support when using with backdrop stands.

Canvas Backdrop Material: Printed on our thick, high-quality signature canvas; shipped rolled to avoid creasing. Canvas backdrop mounting options include wood mounting, roll on tube, or have us mount it to a roller system. If you choose top and bottom wood, the top wood has 3 holes pre-drilled for easy hanging on a portable backdrop stand and the bottom wood is rounded; comes complete with Velcro straps. Can be wiped clean with a damp cloth.

We ship using the most trusted variety of carriers. Merchandise exceeding ground carrier standard weights & size restrictions must be shipped via motor freight or air freight. Any shipping charges displayed online and in our printed catalogs are for small package shipments within the contiguous United States.

Single-mode fibers, designed for long-distance, low-dispersion communication, have much smaller NAs (around 0.10-0.13) compared to multimode fibers (0.20-0.30). This trade-off ensures minimal dispersion in single-mode fibers but requires more precise light coupling due to their narrower acceptance angles.

Bottom Wood Only: Simply the rounded wood at the bottom of the backdrop in which you can roll the canvas or vinyl material onto. Usually chosen for those who plan to use the backdrop on a roller system or other style of mounted backdrop system.

Denny Mfg. is the world's largest manufacturer of photography backdrops, props, and related photographic equipment. Founded in 1971, we are proud to be a family owned and operated business with products MADE in the USA!

In an optical fiber, the acceptance angle depends on the difference in refractive index between the core and the cladding. The higher the difference, the wider the acceptance angle can be.

Grommets: Metal grommets are used to reinforce a hole in a piece of fabric. The grommet option will add one grommet per foot to the width across the top of the backdrop.

Top & Bottom Pole Pocket: 3” pole pocket sewn across the top and the bottom of the backdrop. This additional pole pocket will reduce the height of the backdrop by several inches.

The nominal MFD is a standard value specified by the fiber manufacturer, representing the expected diameter of the fundamental mode within the fiber. It’s often used for design purposes and coupling calculations.

A wider acceptance angle means the fiber can accept light from a wider range of angles and bend more tightly without losing that light. But it also means more dispersion of the signals.

The MFD measures the spatial width of this light intensity pattern. It’s basically the fiber’s “effective core size” including the core and a portion of the cladding that carries light.

Since optical fiber cores are cylindrical, a geometrical cone exists that determines light entrance to the fiber. This is the cone of acceptance.

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Wood Mounting: Includes both top and bottom wood with Velcro straps. Three pre-drilled holes across the top wood for easily hanging on any of our portable backdrop stands. The most popular option for any printed or painted canvas backdrop. This option provides the most protection for your backdrop while in storage.

Attenuation Cable types Calculations Core Dispersion Fiber optic communication Laser LED Loss Macro bending loss Material Numerical aperture Optical fiber cable P-N Junction Photodiode Refractive index Semiconductor Standards Transmission Wavelength

Roll on Cardboard Tube: The canvas or vinyl backdrop will arrive rolled onto a cardboard tube with no mounting for easy storage. The cardboard tube is for temporary shipping use only. Do not hang backdrops using the cardboard tube.

The modes collectively create the total light intensity distribution or pattern within the fiber core. Multimode patterns are complex, while single-mode fibers have a simple Gaussian profile.

Shipments are priced individually based on location and weight. The minimum truck shipment is approximately $200.00 for a shipment weighing 100 lbs or less. All shipments over 100 lbs may incur additional charges. Trust us to ship the most economical way.

We cannot accept any type of return for digital backdrop files, sale or clearance priced items, custom products, modified products or any holiday themed backdrop or prop.

While related, they’re not identical. MFD defines the area within the fiber where most light travels, typically a circular shape. Spot size refers to the focused beam diameter at the fiber output, which can be slightly larger than the MFD due to diffraction. But, in many cases, their values are comparable.

TIR stands for Total Internal Reflection, a critical phenomenon in optical fibers. When light enters the fiber core at an angle exceeding the critical angle (determined by the refractive indices of core and cladding), it undergoes TIR, bouncing back and forth within the core due to repeated reflections, guiding the light signal along the fiber.

Top Wood Only: Canvas or Vinyl is sandwiched between two pieces of wood with three holes pre-drilled for hanging on a backdrop stand. Does not include the rounded bottom wood.

Key optical fiber concepts like acceptance cone, numerical aperture, mode types, and mode field diameter relate to fiber performance. Understanding these parameters provides insight for fiber optic link design and optimization. Matching source characteristics like wavelength and divergence to fiber parameters enables efficient light propagation and minimizes losses.

Twist-Flex Backdrop Material: Portable, collapsible backdrops that are printed or painted on cloth and bound by a wire frame. These backdrops collapse into a small circular shape for simple transport and storage. Comes with a complimentary carrying case.

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The acceptance angle is the maximum angle at which light can enter the fiber core and still propagate down the length of the fiber. Think of it like a tunnel – there is a maximum angle you can enter the tunnel and still be able to pass through it.

The mode field diameter (MFD) represents the actual diameter or spread of light within an optical fiber. Even though most light travels through the core, some of it extends slightly into the inner cladding region.

When light travels in free space like air, it propagates as a continuous wave. However, when this same light enters an optical fiber, it interacts with the fiber’s core and cladding materials. This interaction changes the behavior of the light.

Instead of remaining a single continuous wave, the light inside the fiber splits up into multiple separate beams called modes. Think of a mode as a unique bouncing pattern or path that the light follows down the length of the fiber.

Freedom Cloth Backdrop Material: 100% polyester fabric. Truly wrinkle-resistant backdrop exclusive to Denny Mfg. Machine wash and dryer safe. Roll or fold for easy storage. Portable and can be hung using a backdrop stand, magnet wall, clamps, or add grommets across the top and/or bottom.

For a standard 50/125 μm multimode fiber, the typical NA ranges from 0.20 to 0.29. This range indicates a good balance between light collection and manageable dispersion for short-distance applications like data transmission within buildings.

Optical fibers are essential components in modern telecommunication systems. They transmit information over long distances as light pulses. Understanding key concepts like the cone of acceptance, acceptance angle, numerical aperture, mode propagation, and mode field diameter provides insight into fiber optic performance and design. This guide explains these key parameters in simple terms.

Poly Paper Backdrops: Made of a synthetic coated paper. Backdrops are ultra-light, mobile, and vibrant. We recommend rolling on a cardboard tube for storage to prevent creases. This is the most economical material choice for a photo backdrop. Use clamps for hanging on a crossbar or a low tack painters’ tape to adhere to a wall.