A Field Trial of Fiber Optic Subscriber Loop Systems Utilizing Wavelength-Division Multiplexers

Asatani, Koichi; Watanabe, Ryosuke; Nosu, K.; Matsumoto, Tad; Nihei, Fumihiro

doi:10.1109/tcom.1982.1095694

Cited by 15 publications

(2 citation statements)

References 7 publications

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“…The attenuation of smaller fibers is less at 1.5 pm than 1.3 pm, therefore, an attenuation of 0.6 dB/km at 1. 5 pm is appropriate. Smaller 50-pm core-diameter fibers can be used for the ILD at 0.83 pm without incurring an excessive coupling loss.…”

Section: Intermodulation Distortion Correction Although Second-mentioning

confidence: 99%

Use of long-wavelength devices for analog optical-fiber loops

Stoddard¹,

Tweedy²

1984

J. Lightwave Technol.

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Abstruct-This paper reports on experimental investigations in the use of available long-wavelength (1.3-1.55-pm) devices in wide-band analog optical-fiber loops assumed functioning in a conventional starconfigured switched network. Since for economic reasons analog TV transmission will remain attractive for the foreseeable future, the objective of this work is to extend loop length from 2 km (now feasible) to about 10 km. Distances of up to 10 km are needed to accomme date three or four television channels (each switchable) and narrowband (NB) services.It is shown that with available "experimental" long-wavelength LED's and p-i-n photodiodes distances up to about 10 km are feasible.

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Section: Intermodulation Distortion Correction Although Second-mentioning

confidence: 99%

Use of long-wavelength devices for analog optical-fiber loops

Stoddard¹,

Tweedy²

1984

J. Lightwave Technol.

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“…With these as a backdrop, one of the key technologies is wavelength-division-multiplexing (WDM) technology [ll- [3], that now looks particularly promising for optical transmission systems, especially for optical subscriber loop system. By this technology, which leads to possible cost reduction and flexibility of future expansion, various types of signals such as digital and analog can be simultaneously transmitted at different wavelengths through a multimode or a single-mode optical fiber.…”

mentioning

confidence: 99%

A 4-wavelength optical multi/demultiplexer for WDM subscriber loop systems using analog baseband video transmission

Sano

Watanabe²,

Minowa

1986

J. Lightwave Technol.

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This paper describes the design principles and performance of optical multi/demultiplexers (MUX/DEMUX's) in wavelength-division multiplexing (WDM) subscriber-loop systems over a 50p n core diameter, graded-index (GI), multimode fiber, which employ analog baseband video transmission using laser diodes (LD's).In this WDM arrangement, requirements for MUX/DEMUX's are: 1) low insertion loss; 2) no signal degradation caused by optical interchannel crosstalk; 3) only a small amount of analog baseband signal degradation caused by the use of MUX/DEMUX; 4) a small size and simple structure capable of multiplexing three or four wavelengths; and 5 ) good stability.The newly developed 4-wavelength MUX/DEMUX satisfies the preceding requirements and is suitable for application to WDM subscriber-loop systems using analog baseband signals along with digital signals.

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Stabilized Biasing of Semiconductor Lasers

Swartz

Wooley

1983

Bell System Technical Journal

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In this paper we analyze the design of biasing and control circuits for semiconductor lasers in a generalized context based on an idealized laser characteristic. In particular, we address three major design considerations: whether to bias the laser above or below threshold, how to stabilize the optical output levels independent of variation in the average output power, and to what degree the output levels can be stabilized relative to various circuit and device parameters. Results of our study indicate that to eliminate from the optical output any dependence on either variation in laser device characteristics or the dc average of the input signal, feedback control of both the prebias and modulation current is necessary.

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A Field Trial of Fiber Optic Subscriber Loop Systems Utilizing Wavelength-Division Multiplexers

Cited by 15 publications

References 7 publications

Use of long-wavelength devices for analog optical-fiber loops

Use of long-wavelength devices for analog optical-fiber loops

A 4-wavelength optical multi/demultiplexer for WDM subscriber loop systems using analog baseband video transmission

Stabilized Biasing of Semiconductor Lasers

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