### Abstract

We analyze the application of partial-response equalization and maximum-likelihood sequence estimation in magneto-optical readout. Two filters are proposed, and several aspects of their performance are examined. Filter I has 8 states in its state-transition diagram and is therefore easier to implement than filter II, which has 32 states. We discuss the required signal-to-noise ratio as function of the recorded bit density for these filters. The effects of jitter and bloom on the eye patterns of the output signals are also examined by computer simulation. This analysis indicates that filter II is somewhat superior to filter I, presumably because the output of filter II is more similar to the actual readout signal. We determine the distribution of Euclidean distance between pairs of output sequences and compute upper bounds on the probability of sequence error for both filters. Using two different methods of precoding (i.e., mapping of the user data to the magnetic pattern on the disk), we also compute the probability of bit error for the user data and show that one precoding scheme is slightly better than the other.

Original language | English (US) |
---|---|

Pages (from-to) | 5153-5166 |

Number of pages | 14 |

Journal | Applied Optics |

Volume | 34 |

Issue number | 23 |

DOIs | |

State | Published - 1995 |

### Fingerprint

### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics

### Cite this

*Applied Optics*,

*34*(23), 5153-5166. https://doi.org/10.1364/AO.34.005153

**Partial-response equalization in magneto-optical disk readout : A theoretical investigation.** / Cheng, Lu; Mansuripur, Masud; Howe, D. G.

Research output: Contribution to journal › Article

*Applied Optics*, vol. 34, no. 23, pp. 5153-5166. https://doi.org/10.1364/AO.34.005153

}

TY - JOUR

T1 - Partial-response equalization in magneto-optical disk readout

T2 - A theoretical investigation

AU - Cheng, Lu

AU - Mansuripur, Masud

AU - Howe, D. G.

PY - 1995

Y1 - 1995

N2 - We analyze the application of partial-response equalization and maximum-likelihood sequence estimation in magneto-optical readout. Two filters are proposed, and several aspects of their performance are examined. Filter I has 8 states in its state-transition diagram and is therefore easier to implement than filter II, which has 32 states. We discuss the required signal-to-noise ratio as function of the recorded bit density for these filters. The effects of jitter and bloom on the eye patterns of the output signals are also examined by computer simulation. This analysis indicates that filter II is somewhat superior to filter I, presumably because the output of filter II is more similar to the actual readout signal. We determine the distribution of Euclidean distance between pairs of output sequences and compute upper bounds on the probability of sequence error for both filters. Using two different methods of precoding (i.e., mapping of the user data to the magnetic pattern on the disk), we also compute the probability of bit error for the user data and show that one precoding scheme is slightly better than the other.

AB - We analyze the application of partial-response equalization and maximum-likelihood sequence estimation in magneto-optical readout. Two filters are proposed, and several aspects of their performance are examined. Filter I has 8 states in its state-transition diagram and is therefore easier to implement than filter II, which has 32 states. We discuss the required signal-to-noise ratio as function of the recorded bit density for these filters. The effects of jitter and bloom on the eye patterns of the output signals are also examined by computer simulation. This analysis indicates that filter II is somewhat superior to filter I, presumably because the output of filter II is more similar to the actual readout signal. We determine the distribution of Euclidean distance between pairs of output sequences and compute upper bounds on the probability of sequence error for both filters. Using two different methods of precoding (i.e., mapping of the user data to the magnetic pattern on the disk), we also compute the probability of bit error for the user data and show that one precoding scheme is slightly better than the other.

UR - http://www.scopus.com/inward/record.url?scp=84975565488&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84975565488&partnerID=8YFLogxK

U2 - 10.1364/AO.34.005153

DO - 10.1364/AO.34.005153

M3 - Article

AN - SCOPUS:84975565488

VL - 34

SP - 5153

EP - 5166

JO - Applied Optics

JF - Applied Optics

SN - 1559-128X

IS - 23

ER -