US4521920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and an arrangement for increasing the dynamic range at the input stage of a receiver in an optical fibre information transmission system
Assignee: Telefonaktiebolaget LM Ericsson AB
•
Filing: 1981-08-25
•
Granted: 1985-06-04
•
Expires: 2001-08-25
Abstract
Abstract A method and arrangement in the receiver of an optical fibre information transmission system for increasing the dynamic range in a so-called transimpedance-type input stage. The optical input of the arrangement has a non-amplifying photodiode (3) with two poles or terminals (8,9) e.g. a so-called pin-diode, which is connected by one pole (8) to the input on a high-impedance amplifier (1) with feedback between input and output (7) via a resistance (4). The amplifier output signal is fed back via a signal path, in the form of an integrator (2) connected between the output (7) and the other pole (9) of the photodiode and a capacitance (5) in parallel with the photodiode (3), to the amplifier input.
Inventors
- 👤 Gunnar Forsberg
- 👤 Lars Ingre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:37
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/60; H04B10/66; H04B10/69; H04B10/691; H04B10/6911
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
A method of increasing the dynamic range in a transimpedance type of input stage in a receiver of an optical fibre information transfer system having as an optical input a two-terminal non-amplifying photodiode with a parallel capacitance with one of the terminals of the photodiode being connected to the input of a high impedance amplifier, said method comprising the steps of integrating the output signal of said high impedance amplifier and feeding the resulting integrated signal to the other terminal of the photodiode and capacitive coupling the integrated signal received at said other terminal to said input of the high impedance amplifier.
Claim 2
Independent Claim
102 words
A method of increasing the dynamic range in a transimpedance type of input stage in a receiver of an optical fibre information transfer system having as an optical input a two-terminal non-amplifying photodiode with a parallel capacitance with one of the terminals of the photodiode being connected to the input of a high impedance amplifier, said method comprising the steps of integrating the output signal of said high impedance amplifier and feeding the resulting integrated signal to the other terminal of the photodiode and capacitive coupling the integrated signal received at said other terminal to said input of the high impedance amplifier.
Claim 3
Dependent Claim
95 words
In a transimpedance type of input stage of a receiver which is part of an optical fibre information transfer system having as an optical input a two-terminaled non-amplifying photodiode with a parallel capacitance, apparatus for increasing the dynamic range of the input stage comprising a high-impedance amplifier with feedbak means having an input and an output, means for connecting said input to one terminal of said photodiode, integrating means for connecting said output to the other terminal of said photodiode and capacitive means capacitively coupling said other terminal to said input of the high-impedance amplifier.
Claim 4
Dependent Claim
95 words
In a transimpedance type of input stage of a receiver which is part of an optical fibre information transfer system having as an optical input a two-terminaled non-amplifying photodiode with a parallel capacitance, apparatus for increasing the dynamic range of the input stage comprising a high-impedance amplifier with feedbak means having an input and an output, means for connecting said input to one terminal of said photodiode, integrating means for connecting said output to the other terminal of said photodiode and capacitive means capacitively coupling said other terminal to said input of the high-impedance amplifier.
Claim 5
Dependent Claim
13 words
The apparatus of claim 2 wherein said integrating means is a non-linear integrator.
Claim 6
Dependent Claim
14 words
The apparatus of claim 2 wherein said integrating means is a partially linear integrator.
Claim 7
Dependent Claim
16 words
The apparatus of claim 2 wherein the parallel capacitance is the inherent capacitance of the photodiode.
Claim 8
Dependent Claim
13 words
The apparatus of claim 5 wherein said integrating means is a non-linear integrator.
Claim 9
Dependent Claim
14 words
The apparatus of claim 5 wherein said integrating means is a partially linear integrator.
References Cited (Backward Citations)
US4100407A
Cited
US4218613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |