Mr. Paul M. Charles Profile

Paul M. Charles

at Agilent Technologies UK Ltd

SPIE Involvement:

Author

Publications (3)

Proceedings Article | 11 March 2003 Paper

Optimization of InGaAsP/InP buried heterostructure DFB lasers for 10-Gbit/s operation up to 100 C

Paul Charles, Michele Agresti, Gordon Burns, Graham Berry, D. Bertone, A. Davies, R. Fang, P. Gotta, Constantine Kompocholis, Gloria Magnetti, J. Massa, Giancarlo Meneghini, Roberto Paoletti, Giammarco Rossi, A. Taylor, P. Valenti, Marina Meliga

Proceedings Volume 4947, (2003) https://doi.org/10.1117/12.474862

KEYWORDS: Capacitance, Temperature metrology, Modulation, Semiconducting wafers, Etching, Heterojunctions, Eye, Optical design, Resistance, Manufacturing

Read Abstract +

Proceedings Article | 11 March 2003 Paper

Development of an advanced uncooled 10-Gb DFB laser for volume manufacture

Gordon Burns, Paul Charles

Proceedings Volume 4947, (2003) https://doi.org/10.1117/12.473185

KEYWORDS: Manufacturing, Semiconducting wafers, Temperature metrology, Eye, Optics manufacturing, Laser damage threshold, Photomasks, Local area networks, Modulation, Laser development

Read Abstract +

Optical communication systems operating at 10Gbit/s such as 10Gigabit Ethernet are becoming more and more important in Local Area Networks (LAN) and Metropolitan Area Networks (MAN). This market requires optical transceivers of low cost, size and power consumption. This drives a need for uncooled DFB lasers directly modulated at 10Gbit/s. This paper describes the development of a state of the art uncooled high speed DFB laser which is capable of being manufactured in high volume at the low cost demanded by the GbE market. A DFB laser was designed by developing technological building blocks within the 'conventional’ InGaAsP materials system, using existing well proven manufacturing processes modules wherever possible, limiting the design risk to a few key areas where innovation was required. The temperature and speed performance of the InGaAsP SMQW active layer system was carefully optimized and then coupled with a low parasitic lateral confinement system. Using concurrent engineering, new processes were demonstrated to have acceptable process capability within a manufacturing fabrication environment, proving their ability to support high volume manufacturing requirements. The DFB laser fabricated was shown to operate at 100C chip temperature with an open eye at 10Gbit/s operation (with an extinction ratio >5dB). Up to 90C operation this DFB shows threshold current as low as 29mA, optical power as high as 13mW and it meets the 10Gb scaled Ethernet mask with extinction ratio >6dB. It was found that the high temperature dynamic behavior of these lasers could not be fully predicted from static test data. A production test strategy was therefore followed where equipment was designed to fully test devices/subassemblies at 100C and up to 20Gbit/s at key points in the product build. This facilitated the rapid optimisation of product yields upon manufacturing ramp up and minimization of product costs. This state of the art laser is now transferred into volume manufacture.

SPIE Journal Paper | 1 December 1998

1.3-um large spot size laser for efficient fiber coupling

Frank Wijnands, Charles Crookes, Paul Charles, Nicola Palmer, Michael Chisholm, Simon Wrathall, Adrian Taylor, Richard Ash, Simon Meadowcroft

OE, Vol. 37, Issue 12, (December 1998) https://doi.org/10.1117/12.10.1117/1.601985

KEYWORDS: Fiber lasers, Waveguides, Fiber coupled lasers, Fiber couplers, Single mode fibers, Reflectometry, Near field, Optical alignment, Tolerancing, Optical engineering

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years