Talk:Multi-mode optical fiber

message: As the multi-mode fiber can accomated multiple modes. does this mean that multiple signals can be passed at the same time. if so how many channels? this point is missing in the articleAp aravind (talk) 10:45, 13 February 2010 (UTC)
replies: text: Yes, but not the way you think. Both single and multimode fiber can carry multiple signals at the same time, with individual signals either separated by wavelength (wavelength division multiplexing) or by interleaving the signals in time (time division multiplexing). The multiple transverse modes in multimode fiber are not independently useful: it is difficult to deliberately launch light into one mode, and as the light propagates down the fiber it may "leak" from one transverse mode to another.--Srleffler (talk) 05:58, 14 February 2010 (UTC)
thread_title: Can Multiple Signals be carried simultaneously through the same fiber

message: I'm not convinced there exists an LED modulation limit at a specific data rate.  I have looked through the internet and the references given, and the earliest mention I can find of this number is this paper:
Knobloch, A.; Kiesel, P.; Dohler, G.H.; Windisch, R.; Dutta, B.; Borghs, G.; Heremans, P.; , "Modulation Behaviour of Highly Efficient Non-Resonant Cavity Light-Emitting Diodes," Solid-State Device Research Conference, 1999. Proceeding of the 29th European , vol.1, no., pp. 520- 523, 13-15 September 1999
doi: 10.1109/ESSDERC.1999.195136
They do not say it is a maximum limit, they just say they have achieved it.
I want to change the sentence "LEDs have a maximum modulation rate of 622 Mbit/s because they can not be turned on/off fast enough to support higher bandwidth applications." (which is lifted straight from the 1st reference) to something like "LEDs have a maximum modulation rate because they cannot be modulated fast enough to support higher bandwidth applications - they begin to act capacitatively".
Can anyone find a (peer-reviewed) reference that supports 622MBits/sec - there's a fair few "white papers" etc on the internet which mention it, but not why.
Toomuchrockcankill (talk) 17:05, 13 January 2011 (UTC)
thread_title:  622Mbps Upper limit of LED modulation? 

message: made some technical changes. The edit comment cited IEEE 802.3-2012 which appears to be a new ref. I believe the previous numbers were correct for previous versions of the standard. I have reverted the changes until someone can add the citation and verify. ---—Kvng 14:08, 10 November 2012 (UTC)
thread_title:  New distances 

message: How about a section that describes exactly what multimode fibre actually is? As it stands, the article only describes what it isn't; in other words, how it differs from single mode fibre. Reading the article on single mode fibre isn't exactly enlightening, either. 81.136.202.93 (talk) 15:10, 18 September 2013 (UTC)
replies: text: You missed the link to optical fiber in the first sentence.--Srleffler (talk) 05:51, 20 September 2013 (UTC)
replies: text: Yes, but there is no description into what "multimode" is. What is a "mode". I know the answer, as I'm in the industry, but the point is: there is no description in the article, nor a link to a good description.  — Preceding unsigned comment added by 131.155.215.79 (talk) 11:06, 21 December 2016 (UTC)
replies: text: Very true - I've tried to add a sentence to the lead and explain the point as short as possible. --Zac67 (talk) 18:01, 21 December 2016 (UTC)

text: Not only a section on what it is, but a statement about the applications.  The article assumes the only use for a multimode fiber is telecomm.  After stating what it is and how it functions there should be something about its use in communications and in sensing, lighting, or other applications.  The article should then be separated into a comm section and an other applications section; or the title of this article could just be changed to reference multimode fiber in communications.  John N. (talk) 00:13, 27 May 2018 (UTC)
replies: text:  Thank you for your suggestion. When you believe an article needs improvement, please feel free to make those changes.  Wikipedia is a wiki, so anyone can edit almost any article by simply following the edit this page link at the top. The Wikipedia community encourages you to be bold in updating pages. Don't worry too much about making honest mistakes—they're likely to be found and corrected quickly. If you're not sure how editing works, check out how to edit a page, or use the sandbox to try out your editing skills.  New contributors are always welcome. You don't even need to log in (although there are many reasons you might want to). --Srleffler (talk) 03:43, 27 May 2018 (UTC)
thread_title:  But what is it? 

message: There is some inconsistent usage re: spelling - multimode vs. multi-mode.  I have a sense that the former is probably the correct form, but I can't find what I would call the authoritative reference.  If anyone knows, please point it out.  — Preceding unsigned comment added by 12.177.68.254 (talk) 01:03, 27 May 2015 (UTC)
thread_title:  To hyphenate or not to hyphenate 

message: OM5 is currently in the tentative stage, but most specs are set in place (see TIA TIA-492AAAE). Should it be added to the table or wait until officially out? Bdh008 (talk) 15:39, 23 March 2017 (UTC)
replies: text: OM5 is currently only a marketing term and unless it's widely accepted (unlikely) it can only be included under "Various marketing terms" or so. However, OM1 is far inferior to more advanced types – 10GBASE-SR shows this very clearly, higher speeds make OM1 useless. Differences for OM3 and OM4 can be found in the article. Light does not nearly travel a fiber at the speed of light in vaccum, it's usually at around 67% c0. Note that I've removed the marketing link from your comment. WP is no link list or advertising platform. WP is also no how-to site. --Zac67 (talk) 19:11, 7 March 2018 (UTC)

text: PS: Apparently, OM5 has been standardized by TIA and ISO last year. As with all pay-walled standards, hard facts are scarce – I've added what I could find. --Zac67 (talk) 12:58, 28 March 2018 (UTC)
thread_title:  Should OM5 be added? 

message: OM1 can do 10 Gbps w/LRM optics?  — Preceding unsigned comment added by 66.192.207.194 (talk) 15:06, 28 June 2017 (UTC)
replies: text: Yes, check out 10GBASE-LRM and IEEE 802.3 Clause 68.5. 10GBASE-LX4 could even do 300 m. --Zac67 (talk) 16:44, 28 June 2017 (UTC)
thread_title:  LRM 

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thread_title:  External links modified (February 2018)