Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Systems measurements of 2x2 poled fiber switch
Acreo.
Acreo.
Acreo.
Acreo.
Show others and affiliations
2005 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 17, no 12, 2571-2573 p.Article in journal (Refereed) Published
Abstract [en]

The performance of a 2x2 all-fiber electrooptical switch is characterized in a system at up to 40 Gb/s. Error-free transmission is demonstrated. The device was also employed as a protection switch at 10 Gb/s in an installed fiber link.

Place, publisher, year, edition, pages
2005. Vol. 17, no 12, 2571-2573 p.
Keyword [en]
electrooptic modulation, integrated optoelectronics, optical fiber communication
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-5277DOI: 10.1109/LPT.2005.859126ISI: 000233621000024OAI: oai:DiVA.org:kth-5277DiVA: diva2:8272
Note
QC 20101015Available from: 2005-06-07 Created: 2005-06-07 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Poled fiber devices
Open this publication in new window or tab >>Poled fiber devices
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The topic of this thesis is the development of devices for telecom applications based on poled optical fibers. The focus is on a specific function, optical switching/modulation.

Some of the most important results are summarized below. Optical switching at telecom wavelengths (1.55 μm) is demonstrated in an all-fiber switch based on a fiber with internal electrodes. The fiber is made electro-optically active with a thermal poling process in which a strong electric field is recorded in the glass at a temperature of 255 °C. After poling, the fiber is put in one arm of a Mach-Zehnder interferometer and by applying a voltage across the two electrodes the refractive index is modulated and the optical signal switched from one output port to the other. A switching voltage of 190 V at 1550 nm was achieved, which to the best of our knowledge is the lowest value reported. By carefully matching the lengths of the fibers in the two arms of the interferometer the optical bandwidth could be made as large as 20 nm. The extinction ratio, determined by the power ratio in the two arms, was 30 dB and the highest modulation frequency was 30 MHz. Poled fibers were packaged to increase the thermal and mechanical stability and to make handling easier. 40 Gb/s transmission test through the device showed no bit-error-rate performance degradation. Protection switching of a 10 Gb/s signal is also demonstrated.

The depletion region in a poled fiber was found to be wedge-shaped and very wide, 13 μm and completely overlapped with the core. In a time-resolved poling experiment the recorded electric field was measured. The sign of the field changed after ~20 min, when the depletion region passed through the core, which led to the conclusion that an electric field is present also outside of the depletion region.

A ring laser was constructed with an erbium doped fiber as the gain medium. A fiber modulator was placed inside the cavity and when a small RF signal, with a frequency matched to the cavity ground frequency, was applied to the modulator the laser was modelocked. The output pulse train contained pulses of sub ns duration and is the first demonstration of mode-locking using poled fibers.

A sampled grating with 16 channels spaced by 50 GHz was inserted into the cavity. The fiber modulator had optical bandwidth of 7 nm with center wavelength that depends on the applied voltage. By applying of 10 – 210 V to the modulator it was possible to tune the laser to 11 of the 16 channels for a total tuning range of over 4 nm.

A scheme to deposit 1 μm thin silver electrodes inside the holes of an optical fiber is demonstrated together with a new method of creating periodic electrodes by periodically ablating the silver film electrodes. The periodic electrodes are used to create a quasi-phase matched (QPM) nonlinearity in a fibers which is showed in a proof of principle experiment.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 77 p.
Series
Trita-FYS, ISSN 0280-316X ; 2005:22
Keyword
Physics, optical physics, Poling, twin-hole fiber, fiber electrodes, silver film electrodes, silver diffusion, quasi-phase matching, optical switching, frequency conversion, optical modulation, Fysik
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-262 (URN)91-7178-053-X (ISBN)
Public defence
2005-06-10, Sal FD5, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101015Available from: 2005-06-07 Created: 2005-06-07 Last updated: 2015-03-30Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full texthttp://ieeexplore.ieee.org/search/wrapper.jsp?arnumber=1542152

Search in DiVA

By author/editor
Myrén, Niklas
In the same journal
IEEE Photonics Technology Letters
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 108 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf