Importance

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Abstract

An optical subscriber transmission system is formed of an office center unit and a plurality of subscriber units connected to the office center unit in parallel via an optical fiber, in which system a downward signal is transmitted from the office center unit to the plurality of subscriber units via the optical fiber and upward signals are transmitted from the plurality of subscriber units to the office center unit. The optical subscriber transmission system includes a signal level detecting unit for detecting a level of the downward signal from the office center unit which is received by a subscriber unit, and a control circuit for controlling, based on a detected signal level obtained by the signal level detecting unit, an upward signal to be transmitted from the subscriber unit to the office center unit so that a level of the upward signal is decreased in accordance with an increasing of the detected signal level.

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First Claim