Optical and Quantum Electronics

, Volume 26, Issue 5, pp S529–S545 | Cite as

Semiconductor waveguide directional couplers for coherent receivers

  • C. Caldera
  • N. Caponio
  • C. de Bernardi
  • F. Delpiano
  • G. Destefanis
  • S. Morasca
  • M. Puleo
  • G. Schiavini
  • F. Schiattone
  • A. Stano
  • E. Legros
  • M. Billard
Paper
Received:
Accepted:
  • 36 Downloads

Abstract

Optical waveguide 3-dB couplers integrated on semicondutors have been studied, designed and fabricated, using both bulk and diluted multi-quantum-well InGaAsP/InP-based materials, grown by MOCVD. The device structure is based on the two-mode interference (TMI) principle and is fully compatible for integration with the optoelectronic and electronic components of a coherent receiver. Bulk material couplers provide an output balanced within 0.05 dB per nanometer and an excess loss of 1.4 dB, compared to a straight guide, while coupling loss to a tapered-lensed single mode fibre is 4 dB.

Improved coupling efficiency to single-mode fibres is achieved by use of moderately diluted multi-quantum-well waveguides, which include InGaAsP wells and InP barriers: coupling loss to a tapered-lensed single-mode fibre as low as 0.5 dB and excess loss of 1.8 dB are featured. Couplers fabricated with this waveguide structure have a balance sensitivity of 0.03 to 0.04 dB per nanometer.

A moderately diluted multi-quantum-well 3-dB coupler has been permanently pigtailed and butt-coupled to a dual balanced PIN photoreceiver. This hybrid assembly was tested in a coherent transmission system at 155 and 622 Mbits-1 showing sensitivities, for 10-9 BER, of about-38.0 dBm and-28.8 dBm, respectively.

Keywords

Coupler Optical Waveguide Directional Coupler Device Structure Coupling Efficiency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • C. Caldera
    • 1
    • 2
  • N. Caponio
    • 1
    • 2
  • C. de Bernardi
    • 1
    • 2
  • F. Delpiano
    • 1
    • 2
  • G. Destefanis
    • 1
    • 2
  • S. Morasca
    • 1
    • 2
  • M. Puleo
    • 1
    • 2
  • G. Schiavini
    • 1
    • 2
  • F. Schiattone
    • 1
    • 2
  • A. Stano
    • 1
    • 2
  • E. Legros
    • 3
  • M. Billard
    • 3
  1. 1.Centro StudiCSELTTorinoItaly
  2. 2.Laboratori Telecomunicazioni S.p.A.TorinoItaly
  3. 3.Laboratoire de BagneuxFrance-Telecom, CNET/PABBagneux CedexFrance

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