NLS-Glossary

is the range of modulation frequencies up to some maximum frequency fop where the optical transmission characteristic of the fiber falls by a factor of 3dB. The optical bandwidth is very roughly the same as the bit rate capacity B. Similarly to BL, the product $f_{op}L$, called the bandwidth-length product, remains very roughly constant and a property of the fiber. Strictly, however, BL is not constant (especially for single mode fibers) and one should compare BL products of fibers of comparable length. Frequently, the bandwidth-distance product is expressed as $B{L}^{𝛾}=𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡$where $\gamma$ is an index that is typically between 0.6 and 1

The darker element of a printed bar code field.                                                                                                                                                                                                              

A group of bars and spaces that represent an individual character (alpha, numeric or other ASCII character).                                                                                                             

A device (light pen, laser gun, fixed scanner, etc.) used to read a bar code field.                                                                                                                                                          

The thickness of an individual bar measured from edge to edge of the same bar.                                                                                                                                                         

Another word for bar width reduction (BWR) is “bar width correction” (BWC) or “pixel shaving”. Bar width reduction is a common issue with printing bar codes. So called “dot gain” is part of every printing process and leads to enlargement of bars (while the gaps are reduced). Depending on the printing process, you must compensate these aberrations with the appropriate bar width reduction.