Talk:Beam splitter

message: Do beam splitters split amplitude or intensity?  —Preceding unsigned comment added by 128.112.50.118 (talk) 19:51, 16 May 2008 (UTC)
replies: text: conservation of energy would imply that intensity should be split. Ionsme2 (talk) 21:46, 5 April 2023 (UTC)
thread_title:  Amplitude vs. Intensity

message: >Beam spiltters with single mode fiber for PON networks is using the single mode behavior to split the beam. The splitter is done by physically >splicing two fibers "together" as an X.
How is one fiber split 32 times?  Can someone explain this process?  Is it done by micro-bending, prisms and colors or physically splicing 32 fibers to one?
Also how does it work when the 32 signals return and concentrate into one fiber then to the Central Office?
thank you,
cleandog
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Here is the answer to your question "how is one fiber split 32 times":  It is done by making optical waveguide circuits on a planar substrate. The professional name is "planar lightwave circuit" (PLC). This substrate is typically a silicon substrate. The optical circuit has many cascading 1:2 beam splitter elements so that one beam is split into two and two into four, etc, until 32. The 1:2 beam splitters are the equivalent of the two fibers spliced as an "X".  The 32 output beams of this optical chip are butt-coupled to a v-groove linear fiber array using epoxy. 
For this 32 channel splitter, the input signal is split equally so that each output fiber has 1/32 of the original signal strength. The reverse is also true: when the 32 signals return to the output end of this 32 channel splitter, only 1/32 of the signal end up at the input end of this splitter and it goes back to the central office. 
Quickwin  —Preceding unsigned comment added by Quickwin (talk • contribs) 01:56, 6 September 2008 (UTC)
thread_title:  Beam spiltters with single mode fiber????? 

message: Unfortunately I can´t completely agree with what is stated for the Technicolor beam splitter: The two halves of the prism block were not coated for dichroic function but with a gold layer which should behave colour neutral, yet still enhancing the longer wavelengths. The actual colour separation was arrived at through filters, a green one and one of purple hue, purple being the half-half mixture of red and blue. The third filter was a red tinted gelatine overcoat on the farther of the two films run in Sandwich manner. Orthochromatic, non sensitized, and panchromatic stock was used for the green, blue, and red portion, respectively. Filmtechniker alias 80.219.85.241 (talk) 18:32, 29 November 2007 (UTC)
replies: text: In fact, a suitably deposited transparent coating of gold will preferentially reflect the yellow (red-to-yellow-green) portion of the spectrum, transmitting as much of the rest as it does not absorb. Coatings of some aniline dyes behave similarly. Frederic E. Ives patented this for use in color photography in the 1910s. Technicolor was using such a coating early on, very possibly going back to their two-color system. Anything that helped make more efficient use of the light coming through the lens was a plus, but filters were indeed still needed and used to get adequate color separation. It seems that a multilayer coating of the relatively modern type was substituted at some time before the end of three-strip photography in 1955. AVarchaeologist (talk) 07:11, 24 August 2013 (UTC)
thread_title: Disagreement

message: Many quantum theoretical experiments involve beam splitters, which makes me wonder if it is worth adding something about them to this article, which is currently rather slight. PJTraill (talk) 19:10, 28 July 2015 (UTC)
replies: text: I have now done this (more generally, not just for quantum theory) PJTraill (talk) 21:09, 28 July 2015 (UTC)
thread_title:  Significance in quantum theory etc. 

message: You do not need to have recourse to annihilation operators, second quantification and commutation relations (which, IRONIE-ON of course, to the layman and reader of this article are "well-known" IRONIE-OFF) to deduct the conditions on the matrix. We only have to require that the matrix is unitarian (which is necessary if we want to have preservation of probability) - and the conditions in the text are exactly equivalent to having a unitary matrix.  — Preceding unsigned comment added by 93.207.216.218 (talk) 14:54, 10 April 2017 (UTC)
thread_title:  Bad explanation of quantum description 

message: Partially silvered mirrors are used for a lot of things besides beam splitters.  To me, that should be a separate article. Will (Talk - contribs) 04:36, 27 October 2023 (UTC)
replies: text: Well, we already have an article on one-way mirrors and one on output couplers. The redirect could just as easily go to one of them. The thing is, they're all basically the same things; only the uses differ... and perhaps the manufacturing tolerances. I couldn't see any use in creating a separate article for just that term. One could argue that they're all just forms of beamsplitters. Maybe we should just redirect it to the transmissivity section of the mirror article, and let the reader choose which application they want to explore further from there? I don't see that it really matters much, though, because no other articles are using that redirect for anything, and it get an average of two views a year. Zaereth (talk) 19:26, 27 October 2023 (UTC)

text: It occurs to me that another alternative is to add a subsection about it in the mirror article under the types by reflective material. Need to be very careful there, though, because it once had such a section that became a mess of incorrect explanations of how a one-way mirror works. (Lot's of urban myths about that one.) You're welcome to add such a section, but I'd make it brief, just enough to add wikilinks to these other articles, with just enough explanation that readers who don't want to go on a scavenger hunt won't have to click those links to understand what it means. (Too often technical articles end up that way, but an article that relies on wikilinks to define its subject is lazily written and almost impossible for an outsider to follow. A person should be able to read the entire article and infer the meanings without ever needing to click on a link.) But that way we'd have a place to target this redirect to. Zaereth (talk) 01:51, 28 October 2023 (UTC)
thread_title:  [[Partially Silvered Mirror]]  redirects here, but shouldn't