Analysis of laser diodes as transmitter and preamplifiers in time compression multiplexing systems

Norio Kashima

Research output: Contribution to journalArticle

2 Citations (Scopus)


It is proposed that a laser diode used as a transmitter in the transmission mode be used as a low bias current preamplifier in the receiving mode for time compression multiplexing (TCM) transmission. By adopting the low bias current approach, the preamplifier is wavelength and polarization independent. The maximum bias current is determined to be about 0.5 Ith (Ith = threshold current) by experiments. A transmission experiment at 3.5 Mb/s reveals that about 4 dB of improvement in receiver sensitivity can be obtained by using a laser preamplifier at I = 0.54 Ith when compared to an unbiased laser. The receiver sensitivity of the proposed configuration (laser amplifier at low bias current and photodiode) is estimated by considering the laser preamplifier noise and circuit noise. The laser preamplifier noise is calculated by treating the laser as a traveling wave amplifier with high reflecting facets.

Original languageEnglish
Pages (from-to)323-329
Number of pages7
JournalJournal of Lightwave Technology
Issue number3
Publication statusPublished - 1992 Mar
Externally publishedYes


ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

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