High-saturation high-speed traveling-wave InGaAsP-InP electroabsorption modulator

Li, G.L.; Pappert, S.A.; Mages, P.; Sun, Chen; Chang, William S. C.; Yu, Paul K. L.

doi:10.1109/68.950740

Cited by 102 publications

(18 citation statements)

References 6 publications

(8 reference statements)

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“…This is a similar process to that used to manufacture commercial pump laser modules. The module size, excluding the RF connector and electrical pins, is about 26L x 18W x 10H mm 3 . The EAM chip is quite small, with dimensions about 300 x 200 x 150 µm 3 .…”

Section: Mechanical Design Of the Eam Modulementioning

confidence: 99%

“…[2] The DCW EAM was designed to enhance the optical power handling and provide a greater spurfree dynamic range relative to a more conventional EAM design. [3]. The approach used to achieve this goal was to reduce the optical confinement factor at the electroabsorption (EA) layer in order to enhance the dynamic range and the maximum power of the EAM.…”

Section: Introductionmentioning

confidence: 99%

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Design and development of a package for a diluted waveguide electro-absorption modulator

Shi¹,

Stoffel²,

Shick³

et al. 2008

SPIE Proceedings

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Washington Headquarters Service, Directorate SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)AFRL/RYDP 25 Electronics Pkwy Rome NY 13441-4505 SPONSOR/MONITOR'S ACRONYM(S) SPONSORING/MONITORING AGENCY REPORT NUMBER AFRL-RY-RS-TP-2008-7 DISTRIBUTION AVAILABILITY STATEMENTApproved for public release; distribution unlimited. PA# AFRL WS 07-0388 SUPPLEMENTARY NOTESPaper published in Proc. of SPIE Vol 6975, 69750O. This material is declared a work of the U. S. Government and is not subject to copyright protection in the United States. ABSTRACTExternally coupled electro-absorption modulators (EAM) are commonly used in order to transmit Radio-Frequency (RF) signals on optical fibers. Recently an alternative device design with diluted waveguide structures has been developed. Bench tests show benefits of lower propagation loss, higher power handling (100 mW), and higher normalized slope efficiency. This paper addresses the specific issues involved in packaging the diluted waveguide EAM devices. An evaluation of the device requirements was done relative to the standard processes. Bench tests were performed in order to characterize the optical coupling of the EAM. The photo current maximum was offset from the optical power output maximum. The transmissions vs bias voltage curves were measured, and an XY scanner was used to record the mode field of the light exiting from the EAM waveguide in each position. The Beam Propagation Method was used to simulate the mode field and the coupling efficiency. A design including mechanical, optical and RF elements was developed. A Newport Laser Welding system was utilized for fiber placement and fixation. This paper addresses the specific issues involved in packaging the diluted waveguide EAM devices. An evaluation of the device requirements was done relative to the standard processes. Bench tests were performed in order to characterize the optical coupling of the EAM. The photo current maximum was offset from the optical power output maximum. The transmissions vs. bias voltage curves were measured, and an XY scanner was used to record the mode field of the light exiting from the EAM waveguide in each position. The Beam Propagation Method was used to simulate the mode field and the coupling efficiency. Based on the bench tests and simulation results, a design including mechanical, optical and RF elements was developed. A Newport Laser Welding system was utilized for fiber placement and fixation. The laser welding techniques were customized in order to meet the needs of the EAM package design. SUBJECT TERMS

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Section: Mechanical Design Of the Eam Modulementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and development of a package for a diluted waveguide electro-absorption modulator

Shi¹,

Stoffel²,

Shick³

et al. 2008

SPIE Proceedings

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show abstract

“…Distributed behavior is achieved in a wellknown class of devices, traveling-wave devices ͑traveling-wave electroabsorption modulators, traveling-wave waveguide detectors, etc.͒, though in those cases, it is more of an inductive-capacitive ͑LC͒ form, with propagating waves. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] In this paper, we present another class of devices that rely on distributed RC behavior via diffusive conduction for high-speed optical switching: diffusive conductive switches. [22][23][24][25] These devices completely eliminate the lumped RC limitation and thus operate much faster than their lumped counterparts.…”

Section: Introductionmentioning

confidence: 99%

Optoelectronic switches based on diffusive conduction

Demir

Köklü

Yairi

et al. 2006

Journal of Applied Physics

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We study the process of diffusive conduction that we use in our optoelectronic switches to achieve rapid optical switching ͑on a picosecond time scale͒. We present the characteristic Green's function of the diffusive conduction derived for arbitrary initial conditions. We also report the series solutions of the diffusive conduction obtained for different boundary conditions ͑V = 0 and ٌV = 0 along the device contact lines͒ in different device geometries ͑rectangular and circular mesas͒. Using these analytical results, we investigate the effect of boundary conditions on the switching operation and the steady state behavior in optical links. We demonstrate the feasibility of using such diffusive conductive optoelectronic switches to establish optical links in return-to-zero and non-return-to-zero coding schemes. For multichannel optical switching, we discuss possible use of a single optoelectronic switch to accommodate multiple channels at once, with Ͼ100 optical channels ͑with a 2000 mm −2 channel density and Ͻ10% cross-talk͒, predicted on a 300ϫ 300 m 2 mesa with a device switching bandwidth of Ͼ50 GHz, leading to a 5 Tb/ s aggregate transmission in principle. This approach of using multiple parallel channels on a single switch is completely opposite to the traditional idea of arraying many switches. This proposed scheme eliminates the need for on-chip switch integration and the need for the alignment of the optical channels to the integrated individual switches.

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“…The large optical waveguide mode has been used previously by other researchers primarily to achieve a better coupling to the single-mode optical fiber mode [4], [5], or to achieve better phase matching of microwave and optical phase velocities [6], or to reduce the photocurrent per unit length in detectors [7]. Only in the PCW design, it has been used primarily to reduce the photogenerated carrier per unit incident optical power and to decouple the microwave and optical waveguide designs.…”

mentioning

confidence: 99%

“…For a lumped-electrode device, the length of the electrode limits the electrical bandwidth because of its capacitance. A PCW EAM with traveling wave electrode design will not have this restriction [4]. It is under investigation and its performance will be reported later.…”

mentioning

confidence: 99%

Peripheral-Coupled-Waveguide MQW Electroabsorption Modulator for Near Transparency and High Spurious Free Dynamic Range RF Fiber-Optic Link

Zhuang

Chang

2004

IEEE Photon. Technol. Lett.

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Abstract-Peripheral coupled waveguide (PCW) design has been deployed in InGaAsP multiple quantum-well (MQW) electroabsorption modulator (EAM) at 1.55-m wavelength. PCW enhances the optical saturation power and reduces the optical insertion loss and the equivalent V simultaneously. A radio-frequency link using a 1.3-mm-long lumped-element PCW EAM has achieved experimentally a link gain of 3 dB, at 500 MHz and at input optical power of 80 mW. The corresponding two-tone multioctave spurious-free dynamic range (SFDR) at the same bias is measured at 118 dB Hz 2 3 . The single-octave SFDR at the third-order null bias is 132 dB Hz 4 5 . Index Terms-Electroabsorption modulator (EAM), peripheral coupled waveguide (PCW), radio-frequency (RF) link gain, spurious-free dynamic range (SFDR).

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High-saturation high-speed traveling-wave InGaAsP-InP electroabsorption modulator

Cited by 102 publications

References 6 publications

Design and development of a package for a diluted waveguide electro-absorption modulator

Design and development of a package for a diluted waveguide electro-absorption modulator

Optoelectronic switches based on diffusive conduction

Peripheral-Coupled-Waveguide MQW Electroabsorption Modulator for Near Transparency and High Spurious Free Dynamic Range RF Fiber-Optic Link

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