Data transmission system and receiver device for optical data signals

• US 7,860,405 B2
• Filed: 04/05/2004
• Issued: 12/28/2010
• Est. Priority Date: 04/22/2003
• Status: Expired due to Fees

• Current Assignee: Alcatel SA (Nokia Corporation)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Buchali, Fred
• Primary Examiner(s): Tran; Dzung D
• Application Number:
  US10/816,939
• Publication Number:
  US 20040213585A1
• Time in Patent Office: 2,458 Days
• Field of Search: 398/148, 398/155, 398/159, 398/48, 398/149, 398202-207
• US Class Current: 398/202
• CPC Class Codes: H04B 10/66 Non-coherent receivers, e.g. using direct detection
• CPC Class Codes: H04L 7/027 extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit

Abstract

A receiver device for optical data signals, in particular optical data signals in the Gb/s range, comprising an opto-electrical conversion unit, a frequency multiplicator unit (24) for frequency-multiplying the converted electrical data signal, and a clock recovery unit is characterized in that the frequency multiplicator unit (24) performs a frequency multiplication by a factor of n, with n being a natural number larger than 2. The receiver device has an improved tolerance on dispersion as far as generating a clock line is concerned.

Claims

1. Receiver device for optical data signals, in particular optical data signals in the Gb/s range, comprising:

an opto-electrical conversion unit, which converts an optical signal, that is received from a source external to said receiver device, to a converted electrical data signal;

a frequency filter for the spectral power of the converted electrical data signal, the frequency filter providing a filtered converted electrical data signal;

a frequency multiplicator unit, which frequency-multiplies the filtered converted electrical data signal, thereby producing a frequency-multiplied signal; and

a clock recovery unit comprising a phased locked loop circuit,

wherein the frequency-multiplied signal is used to drive the phase locked loop circuit;

wherein the frequency multiplicator unit performs a frequency multiplication by a factor of n, with n being a natural number larger than 2,

wherein the frequency filter transmits only around B/n, wherein B is the bit rate of the electrical data signal, and

wherein said frequency multiplication is an analog signal processing technique.

2. Receiver device according to claim 1, wherein n=4.

3. Receiver device according to claim 1, wherein the optical data signals are 10 Gb/s signals or 40 Gb/s signals.

4. Receiver device according to claim 1, wherein the clock recovery unit comprises a filter clock recovery circuit.

5. Data transmission system comprising an optical transmission link, in particular an optical fiber system, wherein the optical transmission link has a significant dispersion, and a receiver device according to claim 1.