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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 8 — Apr. 12, 2010
  • pp: 8482–8490

Optical 45° hybrid for demodulating 8-ary DPSK signal

Seok-Hwan Jeong and Ken Morito  »View Author Affiliations

Optics Express, Vol. 18, Issue 8, pp. 8482-8490 (2010)

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We propose a novel optical 45° hybrid employing a 2 × 8 paired interference based multimode interference (MMI) coupler, three phase shifters and three 2 × 2 optical couplers. Since the proposed 45° hybrid can demodulate an 8-ary differential phase shift keyed (8-DPSK) signal with only one delayed Mach-Zehnder interferometer (DMZI), the demodulator has simpler configuration and much smaller device dimensions than conventional 8-DPSK demodulators consisting of four pairs of DMZIs and 2 × 2 optical couplers. We calculate and experimentally demonstrate octagonal phase response of the proposed 45° hybrid with a relative phase deviation of < ± 5° over 32-nm-wide spectral range.

© 2010 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides

ToC Category:
Integrated Optics

Original Manuscript: February 12, 2010
Revised Manuscript: March 22, 2010
Manuscript Accepted: March 23, 2010
Published: April 7, 2010

Seok-Hwan Jeong and Ken Morito, "Optical 45° hybrid for demodulating 8-ary DPSK signal," Opt. Express 18, 8482-8490 (2010)

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