BS EN ISO 11807-2 pdf download – lntegrated optics – Vocabulary —Part 2: Terms used in classification

BS EN ISO 11807-2 pdf download – lntegrated optics – Vocabulary —Part 2: Terms used in classification.
slab waveguide
waveguide which confines the radiation only perpendicular to the substrate
2.3.2
strip waveguide
element which confines the radiation in a two-dimensional cross-sectional area perpendicular to the substrate surface along a one-dimensional path
NOTE In general the core or, in the case of a graded index profile, the corresponding core area, may be formed as:
3.4 embedded channel [see Figure 2a)] or buried channel [see Figure 2b1;
3.4 ridge on a substrate [see Figure 2c)J:
3.4 ridge in a waveguiding layer (see Figure 2d)J or rib on a waveguiding layer [strip-loaded waveguide; see Figure 2e)J
2.3.3
branch
element which divides an input strip waveguide into multiple output strip waveguides
NOTE Depending on the application, a distinction is made between a divider usually a 1 ‘Mdivider and a combiner, usually a N’ 1 combiner.
2.3.4
tap
element which couples a given portion of radiation out of a strip waveguide into another waveguide branching out of the side of the original waveguide
2.3.5
Y-branch
element which divides the power of a guided radiation wave into two radiation waves, usually of the same power and phase shift
directional coupler
four-port element consisting of a pair of strip waveguides in which the fields are mutually coupled and the input and output ends diverge from one another
NOTE 1 The two waveguides may be closely spaced, intersect. or cross each other at an acute angle.
NOTE 2 The function is based on the principle of periodic coupling of radiation by interference. They can be fabricated as either a passive or controllable element. Directional couplers where the waveguides intersect each other (at an acute angle) are also given the designation X-coupler.
2.3.7
3-dB coupler
four-port element which divides the entering power of radiation equally between both output waveguides
2.3.8
N M star coupler
element in which the radiant power of N input waveguides is distributed equally amongst M output waveguides
NOTE The star coupler can be configured from networked Y-branches and/or 3-dB couplers or a multi-mode waveguide section.
2.3.9
waveguide intersection
element consisting of two strip waveguides which intersect one another
NOTE 1 If the angle of intersection is large enough (ideal case 90), then no mutual interference occurs between the guided waves in the individual waveguides.
NOTE 2 If the angle of intersection is small, then coupling occurs (cf. 2.3.6 directIonal coupler): this element is then referred to as an X-coupler,
2.3.10
waveguide offset
abrupt lateral displacement of the waveguide border which can lead to a disturbance of the propagated radiation, or, at the transition between waveguide sections of different or opposite curvature, can be used to improve field overlapping
2.3.6
directional coupler
four-port element consisting of a pair of strip waveguides in which the fields are mutually coupled and the input and output ends diverge from one another
NOTE 1 The two waveguides may be closely spaced, intersect, or cross each other at an acute angle.
NOTE 2 The function is based on the principle of periodic coupling of radiation by interference. They can be fabricated as either a passive or controllable element. Directional couplers where the waveguides intersect each other (at an acute angle) are also given the designation X-coupler.
2.3.7
3-dB coupler
four-port element which divides the entering power of radiation equally between both output waveguides
2.3.8
N’ M star coupler
element in which the radiant power of N input waveguides is distributed equally amongst M output waveguides
NOTE The star coupler can be configured from networked Y-branches and!or 3-dB couplers or a multi-mode waveguide section.
2.3.9
waveguide intersection
element consisting of two strip waveguides which intersect one another
NOTE I If the angle of intersection is large enough (ideal case 90), then no mutual interference occurs between the guided waves in the individual waveguides.
NOTE 2 If the angle of intersection is small, then coupling occurs (cf. 2.3.6 dIrectional cupler). this element is then referred to as an X-couple.
2.3.10
waveguide offset
abrupt lateral displacement of the waveguide border which can lead to a disturbance of the propagated radiation, or, at the transition between waveguide sections of different or opposite curvature, can be used to improve field overlapping.