Polarisation-insensitive travelling-wave electrode electroabsorption (TW-EA) modulator with bandwidth over 50 GHz and driving voltage less than 2 V

Kawano, Kenji; Kobayashi, Masaki; Ueki, M.; T, Ito; Kondoh, Satoshi; Noguchi, Yoshio; Hasumi, Yuji

doi:10.1049/el:19971036

Cited by 77 publications

(14 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, designing the device as part of a 25-transmission line makes longer devices possible and packaging easier. Recently, a 200-m-long TW-EA device with a bandwidth over 54 GHz [105] and a 300-m-long device with a bandwidth of 25 GHz [104] were reported. Both devices were polarization insensitive and operated at 1.55 m. For 20-dB on/off ratio, drive voltage of the 200 and 300 m devices were 3 and 1.9 V, respectively.…”

Section: Traveling-wave Ea Modulatorsmentioning

confidence: 99%

Wide-bandwidth lasers and modulators for RF photonics

Dagli

1999

IEEE Trans. Microwave Theory Techn.

147

View full text Add to dashboard Cite

show abstract

Section: Traveling-wave Ea Modulatorsmentioning

confidence: 99%

Wide-bandwidth lasers and modulators for RF photonics

Dagli

1999

IEEE Trans. Microwave Theory Techn.

147

View full text Add to dashboard Cite

show abstract

“…To overcome the tradeoff between bandwidth and device length, EAMs with traveling-wave (TW) electrodes were developed [9]- [15], where the bandwidth is not limited by lumped RC and the device length can be longer with a higher bandwidth. A typical implementation is illustrated schematically in Fig.…”

Section: Tw Eams and Their Unique Propertiesmentioning

confidence: 99%

High-Speed OTDM and WDM Networks Using Traveling-Wave Electroabsorption Modulators

Chou

Bowers

2007

IEEE J. Select. Topics Quantum Electron.

View full text Add to dashboard Cite

Abstract-We describe the design and performance of a number of elements based on traveling-wave electroabsorption modulators (TW-EAMs) in optical time-division-multiplexing (OTDM) and wavelength-division-multiplexing (WDM) networks. The incorporation of traveling-wave (TW) electrode design into electroabsorption modulators (EAMs) relieves the resistance-capacitance (RC) bandwidth limitation common to lumped components, enabling higher operation speed without shortening the device. As a result, high-speed operation can be combined with essential modulator characteristics such as modulation efficiency and extinction ratio. While significant modulation bandwidth has been achieved, a lesser known aspect is that the TW electrode also provides an extra dimension for improving and enabling functionalities beyond broadband modulation. This new dimension originates from the distributed effect of the TW design and its interactions with distinctive EAM properties. This paper reviews such developments in recent years with specific applications for optical signal processing in OTDM and WDM networks. The covered functionalities include various optical gating operations for OTDM, regenerative wavelength conversions for WDM, and clock recovery.Index Terms-Clock recovery, electroabsorption, optical signal processing, optical time-division multiplexing (OTDM), travelingwave (TW), wavelength-division multiplexing (WDM).

show abstract

“…Toward the high performance in the EAM application, traveling-wave (TW) structure is one of candidates to overcome the conventional RC-lump limitation. Therefore, the waveguide can be made long to enhance the extinction ratio and high modulation efficiency without losing its high-speed performance (Kawano et al 1997;Zhang et al 1999;Li et al 1999;Lewén et al 2003). However, in practical, the limitation of TWEAM in p-i-n layers is generally restricted by the high microwave propagation loss because of the metal skin effect, highly loaded capacitance and the high resistance in p-layer (Giboney et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Optical and microwave analysis of mushroom-type waveguides for traveling wave electroabsorption modulators based on asymmetric intra-step-barrier coupled double strained quantum wells by full-vectorial method

2009

View full text Add to dashboard Cite

The finite difference method is exploited for a full-vectorial analysis of mushroom-type waveguides for traveling wave electroabsorption modulators (TWEAM) based on asymmetric intra-step-barrier coupled double strained quantum wells (AICD-SQW). In this analysis, the discontinuities of the normal components of the electric field across abrupt dielectric interfaces which are known as the limitations of scalar and semivectorial approximation methods are considered. The optical field distributions in mushroom-type TWEAM based on AICD-SQW and conventional ridge-type TWEAM of the same active region for 1.55 µm operation are presented. The important parameters in the high-frequency TWEAM design such as optical effective index which defines optical velocity and transverse mode confinement factor are calculated. Then, the transmission line microwave properties (microwave index, microwave loss, and characteristic impedance) of TWEAMs are obtained. The modulation response of mushroom-type TWEAM is calculated using circuit model by considering interaction between microwave and optical fields in waveguide and compared with conventional ridge-type TWEAM. It is found that increasing the width of p-cladding layer with the same i-layer to reduce the resistance in p-i-n mushroom-type waveguide of TWEAM based on AICD-SQW can improve the microwave propagation loss and thus the high-speed electro-optical response.Keywords Full-vectorial finite-difference method · Traveling wave modulator · Electroabsorption · Mushroom · Asymmetric intra-step-barrier coupled double strained quantum well · Circuit model

show abstract

Polarisation-insensitive travelling-wave electrode electroabsorption (TW-EA) modulator with bandwidth over 50 GHz and driving voltage less than 2 V

Cited by 77 publications

References 9 publications

Wide-bandwidth lasers and modulators for RF photonics

Wide-bandwidth lasers and modulators for RF photonics

High-Speed OTDM and WDM Networks Using Traveling-Wave Electroabsorption Modulators

Optical and microwave analysis of mushroom-type waveguides for traveling wave electroabsorption modulators based on asymmetric intra-step-barrier coupled double strained quantum wells by full-vectorial method

Contact Info

Product

Resources

About