F.V.C. Mendis

National University of Singapore

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Manas K. Haldar

Bose Institute

T.T. Tjhung

Institute for Infocomm Research

J. Wang

National University of Singapore

Hari Krishna Garg

National University of Singapore

B. Selvan

University of Bradford

Y.H. Chew

Trinity College Dublin

K.B. Chia

National University of Singapore

P.S. Kooi

National University of Singapore

Linlin Li

Sun Yat-sen University

Tiong Lim

National University of Singapore

Cooperative Institutions

National University of Singapore

Nanyang Technological University

Agency for Science, Technology and Research

Chinese Academy of Sciences

Singapore Science Park

BT Group (United Kingdom)

University of Chinese Academy of Sciences

Institute for Infocomm Research

Xi'an Jiaotong University

Institute of Materials Research and Engineering

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Equivalent circuit of semiconductor lasers with weak coherent optical feedback

Electronics Letters (1995)

Manas K. Haldar J. Wang F.V.C. Mendis

The equivalent circuit modelling of semiconductor lasers makes simulation of direct modulation of semiconductor lasers extremely simple through the use of circuit simulators such as SPICE. In the Letter the circuit model is extended to incorporate the effect of weak coherent optical feedback into the laser cavity. Results from circuit simulation of the model are compared with results reported earlier as well as results obtained from direct numerical analysis of rate equations.

Spice

Semiconductor optical gain

10.1049/el:19950232

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Citations (2)

Enhancement of modulation bandwidth of laser diodes by injection locking

IEEE Photonics Technology Letters (1996)

J. Wang Manas K. Haldar L. Li F.V.C. Mendis

In this letter, we suggest a new method for significantly enhancing the intrinsic bandwidth of a laser diode through the use of an injection locking technique. Our analysis shows that for moderate and high-injection levels, the bandwidth of a laser diode can be increased to several times its free-running bandwidth.

Injection locking

Laser diode

10.1109/68.475769

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Citations (127)

Analogue optical link for multichannel frequency-modulated television transmission

Electronics Letters (1983)

T.T. Tjhung Tiong Lim F.V.C. Mendis

The performance of an analogue optical link for the transmission of multichannel frequency-modulated TV signals with small frequency deviations is measured. A signal/noise ratio of 47 dB is achieved on a four-channel PAL system with a frequency deviation of 600 kHz, a bandwidth of 16 MHz per channel and an interchannel spacing of 18 MHz.

Frequency deviation

Optical link

Channel spacing

Link (geometry)

10.1049/el:19830076

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Citations (3)

Equivalent circuit model of injection-locked laser diodes

Microwave and Optical Technology Letters (1998)

J. Wang Manas K. Haldar F.V.C. Mendis

An equivalent circuit model of injection-locked laser diodes is proposed. The model provides an easy way of analyzing injection-locked laser diodes through circuit simulation. The model is verified by studying the response of an injection-locked laser diode to direct square-wave modulation. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 124–126, 1998.

Injection locking

Modulation (music)

Laser diode

10.1002/(sici)1098-2760(19980605)18:2<124::aid-mop11>3.0.co;2-7

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Citations (2)

Dynamic considerations in overmodulation of semiconductor laser diodes

Electronics Letters (1996)

Manas K. Haldar K.B. Chia F.V.C. Mendis

Distortion owing to overmodulation of a directly modulated semiconductor laser has been analysed by modelling the semiconductor laser as a static limiter. The authors present some preliminary results on dynamic effects in overmodulation of semiconductor lasers and discuss the applicability of the static model.

Overmodulation

Limiter

10.1049/el:19960434

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Citations (7)

<title>Simulation of distortion in multicarrier subcarrier-multiplexed optical communication systems employing direct intensity modulation of semiconductor lasers</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1996)

Manas K. Haldar Hari Krishna Garg K.B. Chia F.V.C. Mendis

Direct intensity modulation of semiconductor lasers in subcarrier multiplexed (SCM) optical fiber communication systems is of interest because of its simplicity and the possibility of integration of the drive electronics with the laser diode. Direct modulation also produces distortion which degrades system performance. In this paper, we extend a static numerical simulation method for multi-carrier SCM systems to a dynamic simulation employing rate equations. We first show that the results of our simulation agree with analytical results for multi-carrier SCM systems obtained from perturbation theory in the absence of optical reflection into the semiconductor laser. We proceed with the calculation of distortion in the presence of weak reflections. We show that the distortion is lower than what is expected from previous analytical considerations for two subcarriers. Our simulation can also take into account the effect of overmodulation in a dynamic manner. However, our simulation does not take into account the distortion due to device imperfections.

Subcarrier multiplexing

Overmodulation

Distortion (music)

Modulation (music)

Laser diode

10.1117/12.256369

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Citations (0)

Refractometry through optical frequency-domain reflectometry

Electronics Letters (1985)

T.T. Tjhung S. K. Teo F.V.C. Mendis B. Selvan

A refractometer for liquids, based on optical frequency-domain reflectometry, is described which uses a simple fibre probe with minimal contact area with the test liquid. The sensitivity is much better than in earlier reported fibre refractometers.

Reflectometry

Refractometry

10.1049/el:19850432

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Citations (5)

<title>New method for reducing distortion in directly modulated lasers in subcarrier-multiplexed systems</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1995)

F.V.C. Mendis Manas K. Haldar Jian P. Wang

In this paper we use small signal analysis to predict the intrinsic non-linear distortion of an injection-locked semiconductor laser diode directly driven by two subcarriers. We show that the second-order harmonic distortion may be reduced by between 12 and 27 dB over the free- running laser bandwidth of 3.4 GHz and that the third-order intermodulation distortion may be reduced by between 12 and 22 dB over a bandwidth of 5 GHz, for an injection ratio of 0.5.

Subcarrier multiplexing

Distortion (music)

10.1117/12.227834

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Citations (2)

Comparison of cross-modulation and intermodulation distortion in multicarrier fiber optic systems

Optical Engineering (1995)

F.V.C. Mendis

Cross-modulation distortion arising from the dynamic nonlinearity of a semiconductor laser is shown to be an important entity in a multicarrier fiber optic system. The interplay between cross-modulation distortion and intermodulation distortion is investigated for lasers operating at 1.3 and 0.835 μm.

Distortion (music)

Modulation (music)

Fiber-Optic Communication

10.1117/12.188338

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Citations (0)

Photoluminescence and electroluminescence from copper doped zinc sulphide nanocrystals/polymer composite

Applied Physics Letters (1998)

Wenxiu Que Yan Zhou Yee Loy Lam Y.C. Chan C. H. Kam

Cu-doped ZnS nanocrystals were prepared in an inverse microemulsion at room temperature as well as under a hydrothermal condition. X-ray diffraction analysis showed that the diameter of the Cu-doped ZnS nanocrystals particles was about 9 nm. These particles showed a strong photoluminescence intensity and a broad emission band from 490 to 530 nm. The half-width of emission was about 60 nm. Cu-doped ZnS nanocrystals/polymethylmethacrylate composite as a light-emitting layer was used to fabricate a single layer structure electroluminescent device which had low turn on voltage (less than 5 V). The green light of electroluminescence was observed at room temperature. The electroluminescence and photoluminescence spectra were nearly identical at room temperature.

Green-light

Zinc sulfide

10.1063/1.122571

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Citations (82)